Return-Path: X-Original-To: cellar@ietfa.amsl.com Delivered-To: cellar@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2D8191B3466 for ; Thu, 18 Feb 2016 11:50:42 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 2.867 X-Spam-Level: ** X-Spam-Status: No, score=2.867 tagged_above=-999 required=5 tests=[BAYES_50=0.8, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FF_IHOPE_YOU_SINK=2.166, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pSD5XVOItrUm for ; Thu, 18 Feb 2016 11:50:28 -0800 (PST) Received: from mail-ob0-x231.google.com (mail-ob0-x231.google.com [IPv6:2607:f8b0:4003:c01::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6E18F1B345E for ; Thu, 18 Feb 2016 11:50:28 -0800 (PST) Received: by mail-ob0-x231.google.com with SMTP id kf7so2402809obb.1 for ; Thu, 18 Feb 2016 11:50:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=28CIpbtdvWm6zABdT/MDF8T0R9b0B5JpX0qgw8X0C0s=; b=Yral4XEedTjPrTdSxzYSq0uemlkFUfLfqWQnoVRN3roMOu4aCHIFkOVPriXZDJmlVc tzFIzuWx7IO7wpng8P8ZaJUUSthq6bBMqZg/eRYMGUDH6jasO5prSWyljmGOyS+GmuqB fVxrnH0hA12ZCerluAK3OuBpsCLFW5M8Zgm7daGctjEEjh7qCHWvnMypddhuA9/wqILn IQ3dMpuRPrEyVLDcz/hb9diFXru0LqvdLU+gKFwysq49q746lhGzQ7TJxQNOv6vBjaVm c1EpAVCMOFFbNmNyajRuBNELszw0gpi91cn21uhdAJ9ezfKTSqOQmHchN1j39VTmaTE6 X0nw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=28CIpbtdvWm6zABdT/MDF8T0R9b0B5JpX0qgw8X0C0s=; b=ScByYYB4aos/taqWPA33EFCp+IWtUVf32xNZxNaAQw+TYJ0CcuEZlyORfkYDfCZwof EEo3GxAkC/K7QCIgOt+GzuTfxL1DIkRIDdiD5PYTyT3XJgPMGl6/7qaJoa8s/SktggTC iRKEgn+PpQyzuMc7cV8DXwhho7SfQFxcxjcdCN8tbLUlAwHXJkfpiNp0p5Rj8SCL1kE9 l+8kP8CoT8eSWxqoWvbn/NE5Vzpuc0fPj8C8gnXBK3u1/LBbVEAF2Zz1YtY/O7eydq1m 9bb5OaJ/0N9MNyH43XN9GsVXoniLkmPZel0OkSwH/5inKLikPMA+sicf6ZX764ZJfdeo +yoA== X-Gm-Message-State: AG10YOSBTfC66zn03S2Qiz4IRutVKlMR7cd9a9F6xczwe483nJR9utkeEyFQlKi39wHHp0LTdjVsulO1q3f90g== MIME-Version: 1.0 X-Received: by 10.202.188.134 with SMTP id m128mr7914495oif.4.1455825027681; Thu, 18 Feb 2016 11:50:27 -0800 (PST) Received: by 10.202.59.130 with HTTP; Thu, 18 Feb 2016 11:50:27 -0800 (PST) In-Reply-To: References: <568C3CA0.8040300@mediaarea.net> <56B8CD1A.20307@mediaarea.net> <6852A8C0-B1D1-40F9-BE5F-5A7E956C4C42@dericed.com> <9CE0170E-E63D-411D-AFAF-EE5CBB4B56D7@dericed.com> Date: Thu, 18 Feb 2016 11:50:27 -0800 Message-ID: From: Frank Galligan To: Dave Rice Content-Type: multipart/alternative; boundary=001a113dcc82a15718052c10ad98 Archived-At: Cc: Jerome Martinez , Discussion about the current and future development of Matroska , cellar@ietf.org Subject: Re: [Cellar] [Matroska-devel] Colour Format proposal X-BeenThere: cellar@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Codec Encoding for LossLess Archiving and Realtime transmission List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Feb 2016 19:50:42 -0000 --001a113dcc82a15718052c10ad98 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Here is the current proposal, minus the reference to the 265 doc. The parent element would be Video [E0]. Element Name: Colour Level: 4 ID: [55][B0] Mandatory: - Multiple: - Default: - Type: m Description: Settings describing the colour format. Element Name: MatrixCoefficients Level: 5 ID: [55][B1] Mandatory: - Multiple: - Default: 2 Type: u Description: The Matrix Coefficients of the video used to derive luma and chroma values from reg, green, and blue color primaries. For clarity, the value and meanings for MatrixCoefficients are adopted from Table 4 of ISO/IEC 23001-8:2013/DCOR1. (0:GBR, 1: BT709, 2: Unspecified, 3: Reserved, 4: FCC, 5: BT470BG, 6: SMPTE 170M= , 7: SMPTE 240M, 8: YCOCG, 9: BT2020 Non-constant Luminance, 10: BT2020 Constant Luminance) Element Name: BitsPerChannel Level: 5 ID: [55][B2] Mandatory: - Multiple: - Default: 0 Type: u Description: Number of decoded bits per channel. A value of 0 indicates that the BitsPerChannel is unspecified. Element Name: ChromaSubsamplingHorz Level: 5 ID: [55][B3] Mandatory: - Multiple: - Default: - Type: u Description: The amount of pixels to remove in the Cr and Cb channels for every pixel not removed horizontally. Example: For video with 4:2:0 chroma subsampling, the ChromaSubsamplingHorz should be set to 1. Element Name: ChromaSubsamplingVert Level: 5 ID: [55][B4] Mandatory: - Multiple: - Default: - Type: u Description: The amount of pixels to remove in the Cr and Cb channels for every pixel not removed vertically. Example: For video with 4:2:0 chroma subsampling, the ChromaSubsamplingVert should be set to 1. Element Name: CbSubsamplingHorz Level: 5 ID: [55][B5] Mandatory: - Multiple: - Default: - Type: u Description: The amount of pixels to remove in the Cb channel for every pixel not removed horizontally. This is additive with ChromaSubsamplingHorz. Example: For video with 4:2:1 chroma subsampling, the ChromaSubsamplingHorz should be set to 1 and CbSubsamplingHorz should be set to 1. Element Name: CbSubsamplingVert Level: 5 ID: [55][B6] Mandatory: - Multiple: - Default: - Type: u Description: The amount of pixels to remove in the Cb channel for every pixel not removed vertically. This is additive with ChromaSubsamplingVert. Element Name: ChromaSitingHorz Level: 5 ID: [55][B7] Mandatory: - Multiple: - Default: 0 Type: u Description: How Chroma is subsampled horizontally. (0: Unspecified, 1: Left collocated , 2: Half) Element Name: ChromaSitingVert Level: 5 ID: [55][B8] Mandatory: - Multiple: - Default: 0 Type: u Description: How Chroma is subsampled vertically. (0: Unspecified, 1: Top collocated , 2: Half) Element Name: Range Level: 5 ID: [55][B9] Mandatory: - Multiple: - Default: 0 Type: u Description: Clipping of the color ranges. (0: Unspecified, 1: Broadcast range, 2: Full range (no clipping), 3: Defined by MatrixCoefficients/TransferCharacteristics) Element Name: TransferCharacteristics Level: 5 ID: [55][BA] Mandatory: - Multiple: - Default: 2 Type: u Description: The transfer characteristics of the video. For clarity, the value and meanings for TransferCharacteristics 1-15 are adopted from Table 3 of ISO/IEC 23001-8:2013/DCOR1. TransferCharacteristics 16-17 are adopted from <265 doc> and 18 is the proposed value of ARIB STD-B67. (0: Reserved, 1: ITU-R BT.709, 2: Unspecified, 3: Reserved, 4: Gamma 2.2 curve, 5: Gamma 2.8 curve, 6: SMPTE 170M, 7: SMPTE 240M, 8: Linear, 9: Log, 10: Log Sqrt, 11: IEC 61966-2-4, 12: ITU-R BT.1361 Extended Colour Gamut, 13: IEC 61966-2-1, 14: ITU-R BT.2020 10 bit, 15: ITU-R BT.2020 12 bit, 16: SMPTE ST 2084, 17: SMPTE ST 428-= 1 18: ARIB STD-B67 (HLG)) Element Name: Primaries Level: 5 Mandatory: - Multiple: - ID: [55][BB] Default: 2 Type: u Description: The colour primaries of the video. For clarity, the value and meanings for Primaries are adopted from Table 2 of ISO/IEC 23001-8:2013/DCOR1. (0: Reserved, 1: ITU-R BT.709, 2: Unspecified, 3: Reserved, 4: ITU-R BT.470M, 5: ITU-R BT.470BG, 6: SMPTE 170M, 7: SMPTE 240M, 8: FILM, 9: ITU-R BT.2020, 10: SMPTE ST 428-1, 22: JEDEC P22 phosphors) Element Name: MaxCLL Level: 5 ID: [55][BC] Mandatory: - Multiple: - Default: - Type: u Description: Maximum brightness of a single pixel (Maximum Content Light Level) in candelas per square meter (cd/m=C2=B2). Element Name: MaxFALL Level: 5 ID: [55][BD] Mandatory: - Multiple: - Default: - Type: u Description: Maximum brightness of a single full frame (Maximum Frame-Average Light Level) in candelas per square meter (cd/m=C2=B2). Element Name: MasteringMetadata Level: 5 ID: [55][D0] Mandatory: - Multiple: - Default: - Type: m Description: SMPTE 2086 mastering data. Element Name: PrimaryRChromaticityX Level: 6 ID: [55][D1] Mandatory: - Multiple: - Range: 0.0 <=3D f <=3D 1.0 Default: - Type: f Description: Red X chromaticity coordinate as defined by CIE 1931. Element Name: PrimaryRChromaticityY Level: 6 ID: [55][D2] Mandatory: - Multiple: - Range: 0.0 <=3D f <=3D 1.0 Default: - Type: f Description: Red Y chromaticity coordinate as defined by CIE 1931. Element Name: PrimaryGChromaticityX Level: 6 ID: [55][D3] Mandatory: - Multiple: - Range: 0.0 <=3D f <=3D 1.0 Default: - f Description: Green X chromaticity coordinate as defined by CIE 1931. Element Name: PrimaryGChromaticityY Level: 6 ID: [55][D4] Mandatory: - Multiple: - Range: 0.0 <=3D f <=3D 1.0 Default: - Type: f Description: Green Y chromaticity coordinate as defined by CIE 1931. Element Name: PrimaryBChromaticityX Level: 6 ID: [55][D5] Mandatory: - Multiple: - Range: 0.0 <=3D f <=3D 1.0 Default: - Type: f Description: Blue X chromaticity coordinate as defined by CIE 1931. Element Name: PrimaryBChromaticityY Level: 6 ID: [55][D6] Mandatory: - Multiple: - Range: 0.0 <=3D f <=3D 1.0 Default: - Type: f Description: Blue Y chromaticity coordinate as defined by CIE 1931. Element Name: WhitePointChromaticityX Level: 6 ID: [55][D7] Mandatory: - Multiple: - Range: 0.0 <=3D f <=3D 1.0 Default: - Type: f Description: White point X chromaticity coordinate as defined by CIE 1931. Element Name: WhitePointChromaticityY Level: 6 ID: [55][D8] Mandatory: - Multiple: - Range: 0.0 <=3D f <=3D 1.0 Default: - Type: f Description: White point Y chromaticity coordinate as defined by CIE 1931. Element Name: LuminanceMax Level: 6 ID: [55][D9] Mandatory: - Multiple: - Range: 0.0 <=3D f <=3D 9999.99 Default: - Type: f Description: Maximum luminance. Shall be represented in candelas per squar= e meter (cd/m=C2=B2). Element Name: LuminanceMin Level: 6 ID: [55][DA] Mandatory: - Multiple: - Range: 0.0 <=3D f <=3D 999.9999 Default: - Type: f Description: Minimum luminance. Shall be represented in candelas per squar= e meter (cd/m=C2=B2). [IEC23001-8] ISO/IEC 23001-8:2013/DCOR1, "Coding independent media description code points", 2013, < http://standards.iso.org/ittf/PubliclyAvailableStandards/c062088_ISO_IEC_23= 001-8_2013.zip >. wrote: > > > On Tue, Feb 16, 2016 at 11:14 AM, Dave Rice wrote: > >> >> On Feb 16, 2016, at 2:01 PM, Frank Galligan >> wrote: >> >> >> >> On Fri, Feb 12, 2016 at 5:53 PM, Dave Rice wrote: >> >>> Hi, >>> >>> >>> Element Name: Colour >>> Level: 4 >>> ID: [55][B0] >>> Mandatory: - >>> Multiple: - >>> Default: - >>> Type: m >>> Description: Settings describing the colour format. >>> >>> >>> Element Name: Matrix >>> >>> >>> To align better with ISO/IEC 23001-8, could this be labelled as >>> MatrixCoefficients? >>> >> Done >> >> >>> >>> Level: 5 >>> ID: [55][B1] >>> Mandatory: - >>> Multiple: - >>> Default: 2 >>> Type: u >>> Description: ColourMatrix of the video. See ISO/IEC 23001-8 for more >>> information on enumerations. (0: IEC 61966-2-1 (sRGB), 1: >>> BT709, >>> 2: Unspecified, 3: Reserved, 4: FCC, 5: BT470BG, 6: SMPTE >>> 170M, >>> 7: SMPTE 240M, 8: YCOCG, 9: BT2020 Non-constant Luminance, >>> 10: BT2020 Constant Luminance) >>> >>> >>> Suggested description edit: >>> The Matrix Coefficients of the video used to derive luma and chroma >>> values from reg, green, and blue color primaries. For clarity, the valu= e >>> and meanings for MatrixCoefficients are adopted from Table 4 of ISO/IEC >>> 23001-8:2013/DCOR1. (0: IEC 61966-2-1 (sRGB), 1: BT709, 2: Unspecified,= 3: >>> Reserved, 4: FCC, 5: BT470BG, 6: SMPTE 170M, 7: SMPTE 240M, 8: YCOCG, 9= : >>> BT2020 Non-constant Luminance, 10: BT2020 Constant Luminance) >>> >> Done >> >>> >>> Question: >>> Value 0 is listed as "IEC 61966-2-1 (sRGB)" but the table for matrix >>> coefficients in ISO/IEC 23001-8 says "GBR / Typically referred to as RG= B". >>> Should value 0 =3D RGB? >>> >> I changed it to GBR to match 23001-8. >> >> >>> Add footnote: >>> [IEC23001-8] ISO/IEC 23001-8:2013/DCOR1, "Coding independent media >>> description code points", 2013, < >>> http://standards.iso.org/ittf/PubliclyAvailableStandards/c062088_ISO_IE= C_23001-8_2013.zip >>> >. >>> >>> Element Name: BitsPerChannel >>> Level: 5 >>> ID: [55][B2] >>> Mandatory: - >>> Multiple: - >>> Default: 0 >>> Type: u >>> Description: Number of decoded bits per channel. This number may be >>> less for >>> specific channels depending on the Matrix and >>> ChromaSubsampling. A >>> value of 0 is unspecified. >>> >>> >>> It may be fine, but I don't understand "This number may be less for >>> specific channels depending on the Matrix and ChromaSubsampling." Is th= e >>> value is less for specific channels, then it seems as if the value woul= d >>> different among channels, but only one BitsPerChannel is stored for a >>> multi-channel video. >>> >> So we could have separate bits per channel, but then we would have to >> define rgb and yuv. Most people know what this is. Basically the >> information needed is, will the decoded video be 8 bits, 10 bits, 12 bit= s, >> 16 bits, ... Maybe I was just trying to be a little too pedantic. I'm fi= ne >> with removing this sentence. >> >> >> +1 for removing it. >> > Done > > >> >> if any of the ChromaSubsampling elements are set then that implies that >> one or more channels will have a different value. >> >> >> Ah, I had been presuming that you meant bits per channel of a channel's >> sample, rather than the total of the bits per channel (all samples/pixel= s >> of a frame). >> >> So how about we just remove this sentence? >> >> >>> I suggest changing the last line to: A value of 0 indicates that the >>> BitsPerChannel is unspecified. >>> >> Done >> >>> >>> Element Name: ChromaSubsamplingHorz >>> Level: 5 >>> ID: [55][B3] >>> Mandatory: - >>> Multiple: - >>> Default: - >>> Type: u >>> Description: The amount of chrominance pixels to remove for every >>> chrominance >>> pixel not removed horizontally. >>> >>> >>> For these subsampling elements, we may need a statement to say when the= y >>> should be used. For instance in QuickTime's TN2162 >>> https://developer.apple.com/library/mac/technotes/tn2162/_index.html it >>> mandates the use of many values to better describe uncompressed video. = When >>> would these chroma subsampling elements be suggested? >>> >> I'm not really sure I follow. If any of the Cb or Cr channels are down >> sized before encoding, then these elements should be set accordingly. >> >> >> I mean that this field is defined as being optional, but there's no >> indication to say when it should or when it shouldn't be used. This >> probably applies to most of these fields (and much of the matroska spec)= . >> > Ahh, OK. Yeah I have always been under the impression that you shouldn't > be using these elements unless you know what you are doing. Again as you > said that pertains to a lot of the elements in the Matroska spec (as well > as other specs). > > We could always expand upon these further in other documents/guides, but > for the spec I just want to accurately represent information that will be > used. > >> >> I also suggest including an example; such as "Example: For video with >>> 4:1:1 chroma subsampling the ChromaSubsamplingHorz should be set to 3. >>> >> I added "Example: For video with 4:2:0 chroma subsampling the >> ChromaSubsamplingHorz should be set to 1." As pretty much most video is >> 4:4:4 or 4:2:0 nowadays. >> >> >>> Element Name: ChromaSubsamplingVert >>> Level: 5 >>> ID: [55][B4] >>> Mandatory: - >>> Multiple: - >>> Default: - >>> Type: u >>> Description: The amount of chrominance pixels to remove for every >>> chrominance >>> pixel not removed vertically. >>> >>> Element Name: CbSubsamplingHorz >>> Level: 5 >>> ID: [55][B5] >>> Mandatory: - >>> Multiple: - >>> Default: - >>> Type: u >>> Description: The amount of Cb chrominance pixels to remove for every C= b >>> chrominance pixel not removed horizontally. This is >>> additive with >>> ChromaSubsamplingHorz. >>> >>> >>> I'm confused about the relationship between CbSubsamplingHorz >>> and ChromaSubsamplingHorz. >>> >> These elements are only defined because I was trying to handle 4:2:1. >> Basically this is an old format where the Cr channel is half the size of >> the Y channel, and the Cb channel is half the size of the Cr channel. Th= e >> Cb channel is a quarter the size of the Y channel. >> >> The CbSubsampling* elements were a late edition, right before I sent my >> previous email. At first I didn't have these elements and had text that >> 4:2:1 was not supported. >> >> >> Right. Sorry I wrote my comments before considering 4:2:1, since the >> fields are quite customized for situations like 4:2:1, perhaps it should= be >> referenced by name as an example. >> >> How about I change the CbSubsamplingHorz element text too: "The amount o= f >> pixels to remove in the Cr and Cb channels for every pixel not removed >> horizontally." And the CbSubsamplingHorz too: "The amount of pixels to >> remove in the Cb channel for every pixel not removed horizontally. This = is >> additive with ChromaSubsamplingHorz. Example: For video with 4:2:1 chrom= a >> subsampling the ChromaSubsamplingHorz should be set to 1 and >> CbSubsamplingHorz should be set to 1." Does this help the confusion? >> >> >> +1 >> >> Element Name: CbSubsamplingVert >>> Level: 5 >>> ID: [55][B6] >>> Mandatory: - >>> Multiple: - >>> Default: - >>> Type: u >>> Description: The amount of Cb chrominance pixels to remove for every C= b >>> chrominance pixel not removed vertically. This is additive >>> with >>> ChromaSubsamplingVert. >>> >>> >>> Element Name: ChromaSitingHorz >>> Level: 5 >>> ID: [55][B7] >>> Mandatory: - >>> Multiple: - >>> Default: 0 >>> Type: u >>> Description: How Chroma is subsampled horizontally. (0: Unspecified, 1= : >>> Left >>> collocated , 2: Half) >>> >>> Element Name: ChromaSitingVert >>> Level: 5 >>> ID: [55][B8] >>> Mandatory: - >>> Multiple: - >>> Default: 0 >>> Type: u >>> Description: How Chroma is subsampled vertically. (0: Unspecified, 1: >>> Top >>> collocated , 2: Half) >>> >>> >>> Element Name: Range >>> Level: 5 >>> ID: [55][B9] >>> Mandatory: - >>> Multiple: - >>> Default: 0 >>> Type: u >>> Description: Clipping of the color ranges. (0: Unspecified, 1: >>> Broadcast range, >>> 2: Full range (no clipping), 3: Defined by >>> Matrix/TransferFunction) >>> >>> >>> Element Name: TransferFunction >>> >>> >>> To align with ISO/IEC 23001-8, could we use TransferCharacteristics? >>> >> Done. >> >>> >>> Level: 5 >>> ID: [55][BA] >>> Mandatory: - >>> Multiple: - >>> Default: 2 >>> Type: u >>> Description: Transfer Function. See ISO/IEC 23001-8 for more >>> information on >>> enumerations. (0: Reserved, 1: ITU-R BT.709, 2: Unspecifie= d, >>> 3: Reserved, 4: Gamma 2.2 curve, 5: Gamma 2.8 curve, >>> 6: SMPTE 170M, 7: SMPTE 240M, 8: Linear, 9: Log, 10: Log >>> Sqrt, >>> 11: IEC 61966-2-4, 12: ITU-R BT.1361 Extended Colour Gamut= , >>> 13: IEC 61966-2-1, 14: ITU-R BT.2020 10 bit, >>> 15: ITU-R BT.2020 12 bit, 16: SMPTE ST 2084, >>> 17: SMPTE ST 428-1 18: ARIB STD-B67 (HLG)) >>> >>> >>> Comment: >>> The table in ISO/IEC 23001-8 for transfer characteristics does not >>> include values or meaning for 16, 17 and 18 as above. Are these values = from >>> ffmpeg's list? >>> >> 16 and 17 is an artifact form the FFmpeg list, but also form looking at >> FFmpeg CL's I think they are defined in an h265 spec. 18 is a proposed >> value for HLG. >> >> >>> Suggested description edit: >>> The transfer characteristics of the video. For clarity, the value and >>> meanings for TransferCharacteristics are adopted from Table 3 of ISO/IE= C >>> 23001-8:2013/DCOR1. (0: Reserved, 1: ITU-R BT.709, 2: Unspecified, 3: >>> Reserved, 4: Gamma 2.2 curve, 5: Gamma 2.8 curve, 6: SMPTE 170M, 7: SMP= TE >>> 240M, 8: Linear, 9: Log, 10: Log Sqrt, 11: IEC 61966-2-4, 12: ITU-R BT.= 1361 >>> Extended Colour Gamut, 13: IEC 61966-2-1, 14: ITU-R BT.2020 10 bit, 15: >>> ITU-R BT.2020 12 bit) >>> >> Done. >> >> >>> >>> Element Name: Primaries >>> Level: 5 >>> Mandatory: - >>> Multiple: - >>> ID: [55][BB] >>> Default: 2 >>> Type: u >>> Description: Values that can be represented in the CIE 1931 colour >>> space. See >>> ISO/IEC 23001-8 for more information on enumerations. >>> (0: Reserved, 1: ITU-R BT.709, 2: Unspecified, 3: Reserved= , >>> 4: ITU-R BT.470M, 5: ITU-R BT.470BG, 6: SMPTE 170M, 7: >>> SMPTE 240M, >>> 8: FILM, 9: ITU-R BT.2020, 10: SMPTE ST 428-1) >>> >>> >>> Suggested description edit: >>> The colour primaries of the video. For clarity, the value and meanings >>> for TransferCharacteristics are adopted from Table 2 of ISO/IEC >>> 23001-8:2013/DCOR1. (0: Reserved, 1: ITU-R BT.709, 2: Unspecified, 3: >>> Reserved, 4: ITU-R BT.470M, 5: ITU-R BT.470BG, 6: SMPTE 170M, 7: SMPTE >>> 240M, 8: FILM, 9: ITU-R BT.2020, 10: SMPTE ST 428-1) >>> >> Done. >> >>> >>> Note that ISO/IEC 23001-8 also includes a value for 22 for JEDEC P22 >>> phosphors. Any reason to exclude this? >>> >> Added. >> >> >>> >>> Element Name: MaxCLL >>> Level: 5 >>> ID: [55][BC] >>> Mandatory: - >>> Multiple: - >>> Default: - >>> Type: u >>> Description: Maximum brightness of a single pixel in candelas per squa= re >>> meter (cd/m=C2=B2). >>> >>> >>> Suggested: >>> Maximum brightness of a single pixel (Maximum Content Light Level) in >>> candelas per square meter (cd/m=C2=B2). >>> >> Done >> >> >>> >>> Element Name: MaxFALL >>> Level: 5 >>> ID: [55][BD] >>> Mandatory: - >>> Multiple: - >>> Default: - >>> Type: u >>> Description: Maximum brightness of a single full frame in candelas per >>> square >>> meter (cd/m=C2=B2). >>> >>> >>> Suggested: >>> Maximum brightness of a single full frame (Maximum Frame-Average Light >>> Level) in candelas per square meter (cd/m=C2=B2). >>> >> Done >> >> >>> >>> Element Name: MasteringMetadata >>> Level: 5 >>> ID: [55][D0] >>> Mandatory: - >>> Multiple: - >>> Default: - >>> Type: m >>> Description: SMPTE 2086 mastering data. >>> >>> >>> Element Name: PrimaryRChromaticityX >>> Level: 6 >>> ID: [55][D1] >>> Mandatory: - >>> Multiple: - >>> Range: 0 <=3D f <=3D 1 >>> >>> >>> I think "0.0-1.0" is preferred for float range expressions. >>> >> >> Sorry there's an open discussion elsewhere on Cellar about expressing >> float ranges as hexadecimal floating-point literals, so this may be chan= ged >> later, but the meaning should still be the same. >> > No problem. I just had it that way for brevity, much like a lot of my > other descriptions. I don't want to add to much text to a cell of the > Matroska spec table. :) > > >> Done >> >> >>> >>> Default: - >>> Type: f >>> Description: Red X chromaticity coordinate as defined by CIE 1931. >>> >>> >>> Element Name: PrimaryRChromaticityY >>> Level: 6 >>> ID: [55][D2] >>> Mandatory: - >>> Multiple: - >>> Range: 0 <=3D f <=3D 1 >>> Default: - >>> Type: f >>> Description: Red Y chromaticity coordinate as defined by CIE 1931. >>> >>> >>> Element Name: PrimaryGChromaticityX >>> Level: 6 >>> ID: [55][D3] >>> Mandatory: - >>> Multiple: - >>> Range: 0 <=3D f <=3D 1 >>> Default: - >>> f >>> Description: Green X chromaticity coordinate as defined by CIE 1931. >>> >>> >>> Element Name: PrimaryGChromaticityY >>> Level: 6 >>> ID: [55][D4] >>> Mandatory: - >>> Multiple: - >>> Range: 0 <=3D f <=3D 1 >>> Default: - >>> Type: f >>> Description: Green Y chromaticity coordinate as defined by CIE 1931. >>> >>> >>> Element Name: PrimaryBChromaticityX >>> Level: 6 >>> ID: [55][D5] >>> Mandatory: - >>> Multiple: - >>> Range: 0 <=3D f <=3D 1 >>> Default: - >>> f >>> Description: Blue X chromaticity coordinate as defined by CIE 1931. >>> >>> >>> Element Name: PrimaryBChromaticityY >>> Level: 6 >>> ID: [55][D6] >>> Mandatory: - >>> Multiple: - >>> Range: 0 <=3D f <=3D 1 >>> Default: - >>> Type: f >>> Description: Blue Y chromaticity coordinate as defined by CIE 1931. >>> >>> >>> Element Name: WhitePointChromaticityX >>> Level: 6 >>> ID: [55][D7] >>> Mandatory: - >>> Multiple: - >>> Range: 0 <=3D f <=3D 1 >>> Default: - >>> Type: f >>> Description: White point X chromaticity coordinate as defined by CIE >>> 1931. >>> >>> >>> Element Name: WhitePointChromaticityY >>> Level: 6 >>> ID: [55][D8] >>> Mandatory: - >>> Multiple: - >>> Range: 0 <=3D f <=3D 1 >>> Default: - >>> Type: f >>> Description: White point Y chromaticity coordinate as defined by CIE >>> 1931. >>> >>> >>> Element Name: LuminanceMax >>> Level: 6 >>> ID: [55][D9] >>> Mandatory: - >>> Multiple: - >>> Range: 0 <=3D f <=3D 9999.99 >>> Default: - >>> Type: f >>> Description: Maximum luminance. Shall be represented in candelas per >>> square >>> meter (cd/m=C2=B2). >>> >>> >>> Element Name: LuminanceMin >>> Level: 6 >>> ID: [55][DA] >>> Mandatory: - >>> Multiple: - >>> Range: 0 <=3D f <=3D 999.9999 >>> Default: - >>> Type: f >>> Description: Minimum luminance. Shall be represented in candelas per >>> square >>> meter (cd/m=C2=B2). >>> >>> >>> >>> >>> I removed ChromaSubsampling and added ChromaSubsamplingHorz, >>> ChromaSubsamplingVert, CbSubsamplingHorz, and CbSubsamplingVert. >>> >>> This is how I think the elements should be written for the different >>> subsampling types: >>> 1: 4:4:4 >>> - ChromaSubsamplingHorz and ChromaSubsamplingVert will not be set a= s >>> there should be no chroma subsampling. >>> >>> 2: 4:4:0 >>> - ChromaSubsamplingHorz :not set >>> - ChromaSubsamplingVert :1 >>> >>> 3: 4:2:2 >>> - ChromaSubsamplingHorz :1 >>> - ChromaSubsamplingVert :not set >>> >>> 4: 4:2:1 >>> - ChromaSubsamplingHorz :1 >>> - ChromaSubsamplingVert :not set >>> - CbSubsamplingHorz :1 >>> - CbSubsamplingVert :not set >>> - We could remove CbSubsamplingHorz and CbSubsamplingVert if we didn'= t >>> care about handling formats where the Cr and Cb channels are different >>> sizes. >>> >>> >>> I forgot about 4:2:1. That answers my question about CbSubsmaplingHorz >>> though perhaps we need a narrative section to expand on this with the >>> examples you have here. >>> >>> 5: 4:2:0 >>> - ChromaSubsamplingHorz :1 >>> - ChromaSubsamplingVert :1 >>> >>> 6: 4:1:1 >>> - ChromaSubsamplingHorz :3 >>> - ChromaSubsamplingVert :not set >>> >>> 7: 4:1:0 >>> - ChromaSubsamplingHorz :3 >>> - ChromaSubsamplingVert :1 >>> >>> 8: 3:1:1 >>> - ChromaSubsamplingHorz :2 >>> - ChromaSubsamplingVert :not set >>> - I'm assuming the luma subsampling can be handled by PixelWidth, and >>> DisaplyWidth. >>> >>> Jerome's vertical subsampling of 4 >>> - ChromaSubsamplingHorz :not set >>> - ChromaSubsamplingVert :3 >>> >>> >>> >>> The other issue I want to bring up is the value of "18: ARIB STD-B67 >>> (HLG)" in TransferFunction. Unfortunately, in WebM we will need to use >>> this value sooner than Matroska v4 will be finalized. Should I make thi= s >>> value much higher? Or leave at 18? I think "16: SMPTE ST 2084" and "17: >>> SMPTE ST 428-1" will be standardized across most documents, like 1-15 >>> are. Just not sure if 18 will be HLG. >>> >>> >>> I see a few references to ARIB STD-B67 as 18, such as >>> http://www.arib.or.jp/english/html/overview/doc/2-STD-B32v3_5.pdf. >>> Perhaps we need a caveat that values 1-15 are defined based upon ISO/IE= C >>> 23001-8. Then for values 16, 17, and 18 we could add better description= s >>> and citations to define it better internally. >>> >> I'm fine with this. I'm just worried about the case where we diverge fro= m >> one of the lists. Would be nice to have one canonical list. >> >> >>> If (hopefully) a revision to ISO/IEC 23001-8 adds those values (as >>> expected) then we could update are description to say all values are >>> defined by ISO/IEC 23001-8. >>> >> Sounds good to me. >> >> >> It's a bit risky. Perhaps for now we should clarify that values 1-15 are >> defined by ISO/IEC 23001-8 and then give customized definitions for 16, = 17, >> 18. >> > > Following Jerome's comment, how about this for TransferCharacteristic: > "The transfer characteristics of the video. For clarity, the value and > meanings for TransferCharacteristics 1-15 are adopted from Table 3 of > ISO/IEC 23001-8:2013/DCOR1. TransferCharacteristics 16-17 are adopted fro= m > <265 doc> and 18 is the proposed value of ARIB STD-B67. (0: Reserved, 1: > ITU-R BT.709, 2: Unspecified, 3: Reserved, 4: Gamma 2.2 curve, 5: Gamma 2= .8 > curve, 6: SMPTE 170M, 7: SMPTE 240M, 8: Linear, 9: Log, 10: Log Sqrt, 11: > IEC 61966-2-4, 12: ITU-R BT.1361 Extended Colour Gamut, 13: IEC 61966-2-1= , > 14: ITU-R BT.2020 10 bit, 15: ITU-R BT.2020 12 bit, 16: SMPTE ST 2084, 17= : > SMPTE ST 428-1 18: ARIB STD-B67 (HLG))" > > Dave Rice >> >> > --001a113dcc82a15718052c10ad98 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Here is the current proposal, minus the reference to the 2= 65 doc.

The parent ele= ment would be Video [E0].



Element Name: Colour

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A04

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0[55][B0]

Mandatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0m

Descr= iption: =C2=A0Settings describing the colour format.



Element Name: MatrixCoefficients

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A05

ID: =C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][B1]

Mandatory: =C2=A0=C2=A0=C2=A0-=

Multiple: =C2=A0=C2=A0=C2=A0=C2= =A0-

Default: =C2=A0=C2= =A0=C2=A0=C2=A0=C2=A02

Ty= pe: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u

Description: =C2=A0The Matrix Coefficients of the vide= o used to derive luma and

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0chroma values from reg, green, and blue color pr= imaries. For

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0clarity, the value and meanings for MatrixCoefficients are adop= ted

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0from Table 4 of ISO/IEC 23001-8:2013/DCOR1. (0:GBR, 1: BT709,

=

= =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A02: Unspec= ified, 3: Reserved, 4: FCC, 5: BT470BG, 6: SMPTE 170M,

=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A07: SMPTE 240M, 8: YCO= CG, 9: BT2020 Non-constant Luminance,

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A010: BT2020 Constant Luminance)



Element Name: BitsPerChannel

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A05

ID: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][B2]

Mandatory: =C2=A0=C2=A0=C2=A0-

=

= Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-=

Default: =C2=A0=C2=A0=C2= =A0=C2=A0=C2=A00

Type: = =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u

Description: =C2=A0Number of decoded bits per chan= nel. A v= alue of 0 indicates that

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0the BitsPerChannel is unspecified.



Element Name: ChromaSubsamplingHorz

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05=

ID: =C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][B3]

Mandatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Default: =C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0-

Type: =C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u

Description: =C2=A0The amount of pixels to remove in the Cr and= Cb channels for every

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0pixel not removed horizontally. Example: For video = with 4:2:0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0chroma subsampling, the ChromaSubsamplingHorz should be set to = 1.



Element Name: = ChromaSubsamplingVert

Lev= el: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0[55][B4]

Mand= atory: =C2=A0=C2=A0=C2=A0-

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0u

Description: = =C2=A0Th= e amount of pixels to remove in the Cr and Cb channels for every

=

= =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0pixel not= removed vertically. Example: For video with 4:2:0 chroma

=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0subsampling, th= e ChromaSubsamplingVert should be set to 1.


Eleme= nt Name: CbSubsamplingHorz

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0[55][B5]

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0u

Descript= ion: =C2=A0The amount of pixels to remove in the Cb channel for every pixel<= /p>

=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0not re= moved horizontally. This is additive with

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ChromaSubsamplingHorz. Example: F= or video with 4:2:1 chroma

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0subsampling, the ChromaSubsamplingHorz should be= set to 1 and

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0CbSubsamplingHorz should be set to 1.



Element Name: CbSubsamplingVert<= /p>

Level: =C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A05

ID: = =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][B6]=

Mandatory: =C2=A0=C2=A0=C2=A0-<= /span>

Multiple: =C2=A0=C2=A0=C2= =A0=C2=A0-

Default: =C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u

Description: =C2=A0The amount of pixels to remov= e in the Cb channel for every pixel

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0not removed vertically. This is additiv= e with

.=



Element Name: Ch= romaSitingHorz

Level: =C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0[55][B7]

Mandatory:= =C2=A0=C2=A0=C2=A0-

Mult= iple: =C2=A0=C2=A0=C2=A0=C2=A0-

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A00

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0u

Description: =C2=A0H= ow Chroma is subsampled horizontally. (0: Unspecified, 1: Left

<= p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><= span style=3D"font-size:13.3333px;font-family:'Courier New';vertica= l-align:baseline;white-space:pre-wrap"> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0collocated , 2: Half)

Element Name: ChromaSitingVer= t

Level: =C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A05

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][B8= ]

Mandatory: =C2=A0=C2=A0= =C2=A0-

Multiple: =C2=A0= =C2=A0=C2=A0=C2=A0-

Defau= lt: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A00

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u

Description: =C2=A0How Chroma is = subsampled vertically. (0: Unspecified, 1: Top

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0collocated , 2: Half)



Element Name: Range

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A05

ID: =C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][B9]

Mandatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Default: =C2=A0=C2=A0=C2=A0= =C2=A0=C2=A00

Type: =C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u

Description: =C2=A0Clipping of the color ranges. (0: Unspecified, 1: Broadcast range,

=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A02: Full range (no clippi= ng), 3: Defined by

=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= MatrixCo= efficients/TransferCharacteristics)



Element Name: TransferCharacteristics

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A05

ID: =C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][BA]

Mandatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0= -

Default: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A02

Type:= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u

Description: =C2=A0The transfer characteristics of the vi= deo. For clarity, the value

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0and meanings for TransferCharacteristics 1-15 ar= e adopted from

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0Table 3 of ISO/IEC 23001-8:2013/DCOR1. TransferCharacteristi= cs

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A016-17 are adopted from <265 doc> and 18 is the proposed value of

=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= ARIB STD-B67. (0: Reserved, 1: ITU-R BT.709, 2: Unspecified,

=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A03: Reserved, 4:= Gamma 2.2 curve, 5: Gamma 2.8 curve,

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06: SMPTE 170M, 7: SMPTE 240M, 8: Lin= ear, 9: Log, 10: Log Sqrt,

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A011: IEC 61966-2-4, 12: ITU-R BT.1361 Extended Co= lour Gamut,

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A013: IEC 61966-2-1, 14: ITU-R BT.2020 10 bit,

=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A015: ITU-R BT.20= 20 12 bit, 16: SMPTE ST 2084, 17: SMPTE ST 428-1

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A018: ARIB STD-B67 (HLG))



Element Name: Primar= ies

Level: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A05

Mandatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0[55][BB]

D= efault: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A02

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u

Description: =C2=A0The colour primari= es of the video. For clarity, the value and

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0meanings for Primaries are ado= pted from Table 2 of

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0ISO/IEC 23001-8:2013/DCOR1. (0: Reserved, 1: ITU-R BT.= 709,

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A02: Unspecified, 3: Reserved, 4: ITU-R BT.470M, 5: ITU-R BT.470BG,

=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06: = SMPTE 170M, 7: SMPTE 240M, 8: FILM, 9: ITU-R BT.2020,

=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A010: SMPTE ST 428-1, 2= 2: JEDEC P22 phosphors)



Element Name: MaxCLL

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0[55][BC]

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0u

Descript= ion: =C2=A0Maximum brightness of a single pixel (Maximum Content Light Level)

=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0in can= delas per square meter (cd/m=C2=B2).



Element Name: MaxFALL

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05<= /p>

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][BD]

Mandatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-<= /span>

Type: =C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u

Description: =C2=A0Maximum brightness of a single full frame (Maximum Frame-= Average

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0Light Level) in candelas per square meter (cd/m=C2=B2).

=

Element Name: MasteringMeta= data

Level: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A05

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55]= [D0]

Mandatory: =C2=A0=C2= =A0=C2=A0-

Multiple: =C2= =A0=C2=A0=C2=A0=C2=A0-

De= fault: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0m

Description: =C2=A0SMPTE 2086 = mastering data.



E= lement Name: PrimaryRChromaticityX

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0[55][D1]

Mandatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A00.0 <=3D f <=3D 1.0

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0f

Descr= iption: =C2=A0Red X chromaticity coordinate as defined by= CIE 1931.



Elemen= t Name: PrimaryRChromaticityY

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0[55][D2]

Mandatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00.0 <=3D f <=3D 1.0

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0f

Description= : =C2=A0Red Y chromaticity coordinate as defined by CIE 1= 931.



Element Name= : PrimaryGChromaticityX

L= evel: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0[55][D3]

M= andatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00.0 <=3D f <=3D 1.0

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

f

Green X chromaticity coordinate as d= efined by CIE 1931.



Element Name: PrimaryGChromaticityY

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06

=

= ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][D4]

Mandatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A00.0 <=3D f <=3D 1.0

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0f

De= scription: =C2=A0Green Y chromaticity coordinate as defin= ed by CIE 1931.


Element Name: PrimaryBChromat= icityX

Level: =C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[= 55][D5]

Mandatory: =C2=A0= =C2=A0=C2=A0-

Multiple: = =C2=A0=C2=A0=C2=A0=C2=A0-

Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00.0 <= ;=3D f <=3D 1.0

Defaul= t: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f

Description: =C2=A0Blue X chromaticity coordinate as defined by CIE 1931.


Element Name: PrimaryBChromaticity= Y

Level: =C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A06

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][D6= ]

Mandatory: =C2=A0=C2=A0= =C2=A0-

Multiple: =C2=A0= =C2=A0=C2=A0=C2=A0-

Range= : =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00.0 <=3D f= <=3D 1.0

Default: =C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f

Description: =C2=A0Blu= e Y chromaticity coordinate as defined by CIE 1931.



Element Name: WhitePointChromaticityX

Level: =C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A06

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][D7]

Mandatory: =C2=A0=C2=A0=C2= =A0-

Multiple: =C2=A0=C2= =A0=C2=A0=C2=A0-

Range: = =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00.0 <=3D f &= lt;=3D 1.0

Default: =C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f

Description: =C2=A0Whi= te point X chromaticity coordinate as defined by CIE 1931.


Element Name: WhitePointChromatic= ityY

Level: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A06

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55]= [D8]

Mandatory: =C2=A0=C2= =A0=C2=A0-

Multiple: =C2= =A0=C2=A0=C2=A0=C2=A0-

Ra= nge: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00.0 <= =3D f <=3D 1.0

Default= : =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f

=

= Description: =C2=A0White point Y chromaticity coordinate as defined by CIE 1931.

<= br>

Element Name: LuminanceMax

Level: =C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A06

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][D9]

Mandatory: =C2=A0=C2=A0=C2= =A0-

Multiple: =C2=A0=C2= =A0=C2=A0=C2=A0-

Range: = =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00.0 <=3D f &= lt;=3D 9999.99

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0-

Type: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f

Description: =C2=A0Maximum luminance. Shall be represented in = candelas per square

=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= meter (cd/m=C2=B2).



Element Name: LuminanceMin

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06

ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0[55][DA]

Mandatory: =C2=A0=C2=A0=C2=A0-

Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-

Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00.0 <=3D f <=3D 999.9999

Default:= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-

Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f

<= p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><= span style=3D"font-size:13.3333px;font-family:'Courier New';vertica= l-align:baseline;white-space:pre-wrap">Description: =C2=A0Minimum luminance= . Shall be represented in candelas per square

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0meter (cd/m=C2=B2).


[IEC23= 001-8] ISO/IEC 23001-8:2013/DCOR1, "Coding independent media descripti= on code points", 2013, <http://standards.iso.org/ittf/PubliclyAvailableStandards/c062088_I= SO_IEC_23001-8_2013.zip>.


<reference to h265 doc)


=

On Tu= e, Feb 16, 2016 at 11:56 AM, Frank Galligan <frankgalligan@gmail.c= om> wrote:


On Tue, Feb = 16, 2016 at 11:14 AM, Dave Rice <dave@dericed.com> wrote:
=

On Feb 16, 2016, at 2:01 PM, Frank Galligan <frankgalligan@gmail.c= om> wrote:



On Fri, Feb 12, 2016 at 5:53 PM, Dave R= ice <dave@dericed.com> wrote:
Hi,

Element Name: Colour
Level: =C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A04
ID: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][B0]
Mandatory: =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2= =A0=C2=A0=C2=A0-
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0-
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0m
Description: =C2=A0Settings describing the col= our format.


Element Name: Matrix

To align= better with ISO/IEC 23001-8, could this be labelled as MatrixCoefficients?=
Done
=C2=A0

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05
= ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0[55][B1]
Mandatory: =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
D= efault: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A02
Type: =C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Descriptio= n: =C2=A0ColourMatrix of the video. See ISO/IEC 23001-8 for more
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0information on enumerations. (0: IEC 61966-2-1 (sRGB), 1: BT= 709,
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A02: Unspecified, 3: Reserved, 4: FCC, 5: BT470= BG, 6: SMPTE 170M,
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A07: SMPTE 240M, 8: YCOCG, 9: BT= 2020 Non-constant Luminance,
=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A010: BT2020 Constant L= uminance)

Suggested description edit:
The Matrix Coef= ficients of the video used to derive luma and chroma values from reg, green= , and blue color primaries. For clarity, the value and meanings for MatrixC= oefficients are adopted from Table 4 of ISO/IEC 23001-8:2013/DCOR1. (0: IEC= 61966-2-1 (sRGB), 1: BT709, 2: Unspecified, 3: Reserved, 4: FCC, 5: BT470B= G, 6: SMPTE 170M, 7: SMPTE 240M, 8: YCOCG, 9: BT2020 Non-constant Luminance= , 10: BT2020 Constant Luminance)
D= one=C2=A0

Question:
Value 0 is listed as "IEC 61966-= 2-1 (sRGB)" but the table for matrix coefficients in ISO/IEC 23001-8 s= ays "GBR / Typically referred to as RGB". Should value 0 =3D RGB?=
I changed it to GBR to match 23001-8.


Add footnote:
[IEC23001-8] ISO/IEC 23001-8:= 2013/DCOR1, "Coding independent media description code points", 2= 013, <http://standards.iso.= org/ittf/PubliclyAvailableStandards/c062088_ISO_IEC_23001-8_2013.zip>= ;.

Element Name: Bi= tsPerChannel
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A05
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0[55][B2]
Mandatory: =C2=A0=C2=A0= =C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
T= ype: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Description: =C2=A0Number of decoded bits per channel. This number may be = less for
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0specific channels depending on the Matr= ix and ChromaSubsampling. A
=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0value of 0 is unspeci= fied.
It may be fine, but I don't understand "This number m= ay be less for specific channels depending on the Matrix and ChromaSubsampl= ing." Is the value is less for specific channels, then it seems as if = the value would different among channels, but only one BitsPerChannel is st= ored for a multi-channel video.
So we co= uld have separate bits per channel, but then we would have to define rgb an= d yuv. Most people know what this is. Basically the information needed is, = will the decoded video be 8 bits, 10 bits, 12 bits, 16 bits, ... Maybe I wa= s just trying to be a little too pedantic. I'm fine with removing this = sentence.

+1 = for removing it.
Done
=C2=A0

if any of the ChromaSubsampling elements are set the= n that implies that one or more channels will have a different value.
=

Ah, I had been pre= suming that you meant bits per channel of a channel's sample, rather th= an the total of the bits per channel (all samples/pixels of a frame).
=
So how about we just remove this senten= ce?


I suggest changing the last line to: A value of = 0 indicates that the BitsPerChannel is unspecified.
Done=C2=A0

Element Name: ChromaSubsampling= Horz
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= 5
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0[55][B3]
Mandatory: =C2=A0=C2=A0=C2=A0-
= Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Descriptio= n: =C2=A0The amount of chrominance pixels to remove for every chrominance
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0pixel not removed horizontally.
=

For these subsampl= ing elements, we may need a statement to say when they should be used. For = instance in QuickTime's=C2=A0TN2162 https://dev= eloper.apple.com/library/mac/technotes/tn2162/_index.html=C2=A0it manda= tes the use of many values to better describe uncompressed video. When woul= d these chroma subsampling elements be suggested?
I'm not really sure I follow. If any of the Cb or Cr channels= are down sized before encoding, then these elements should be set accordin= gly.=C2=A0

I = mean that this field is defined as being optional, but there's no indic= ation to say when it should or when it shouldn't be used. This probably= applies to most of these fields (and much of the matroska spec).
Ahh, OK. Yeah I have always been under the impres= sion that you shouldn't be using these elements unless you know what yo= u are doing. Again as you said that pertains to a lot of the elements in th= e Matroska spec (as well as other specs).

We could= always expand upon these further in other documents/guides, but for the sp= ec I just want to accurately represent information that will be used.
=

I also suggest including an example; such as "Example: For video wit= h 4:1:1 chroma subsampling the=C2=A0ChromaSubsamplingHorz should be set to = 3.
I added "Example: For video with= 4:2:0 chroma subsampling the ChromaSubsamplingHorz should be set to 1.&quo= t; As pretty much most video is 4:4:4 or 4:2:0 nowadays.


Element Name: ChromaSubsamplingVert
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[= 55][B4]
Mandatory: =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Default: = =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Description: =C2=A0= The amount of chrominance pixels to remove for every chrominance
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0pixel not removed vertically.

E= lement Name: CbSubsamplingHorz
Level: =C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A05
ID: =C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][B5]
Mandat= ory: =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0= =C2=A0-
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
<= span style=3D"font-size:13.3333px;font-family:'Courier New';color:r= gb(34,34,34);font-weight:400;font-style:normal;font-variant:normal;text-dec= oration:none;vertical-align:baseline;white-space:pre-wrap;background-color:= rgb(255,255,255)">Description: =C2=A0The amount of Cb chrominance pixels to= remove for every Cb
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0chrominance pixel not remov= ed horizontally. This is additive with
=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ChromaSub= samplingHorz.
=
I'm confused about the relationship between=C2=A0CbSubsa= mplingHorz and=C2=A0ChromaSubsamplingHorz.
These elements are only defined because I was trying to handle 4:2:1. Ba= sically this is an old format where the Cr channel is half the size of the = Y channel, and the Cb channel is half the size of the Cr channel. The Cb ch= annel is a quarter the size of the Y channel.

The = CbSubsampling* elements were a late edition, right before I sent my previou= s email. At first I didn't have these elements and had text that 4:2:1 = was not supported.

Right. Sorry I wrote my comments before considering 4:2:1, since the = fields are quite customized for situations like 4:2:1, perhaps it should be= referenced by name as an example.

=
How about I change the CbSubsamplingHorz element text too: "The amoun= t of pixels to remove in the Cr and Cb channels for every pixel not removed= horizontally." And the CbSubsamplingHorz too: "The amount of pix= els to remove in the Cb channel for every pixel not removed horizontally. T= his is additive with ChromaSubsamplingHorz. Example: For video with 4:2:1 c= hroma subsampling the ChromaSubsamplingHorz should be set to 1 and CbSubsam= plingHorz should be set to 1." Does this help the confusion?

+1

=
Element Name: CbSubsamplingVert
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0[55][B6]
Mandatory: =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Defau= lt: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Description: =C2= =A0The amount of Cb chrominance pixels to remove for every Cb
<= div style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0chrominance pixel not removed vertically. This is additive with=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0ChromaSubsamplingVert.


<= div style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt">Element Name: ChromaSitingHorz
Level: =C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05
ID: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][B7]
Mandatory: =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2= =A0=C2=A0=C2=A0-
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2= =A00
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0u
Description: =C2=A0How Chroma is subsampled ho= rizontally. (0: Unspecified, 1: Left
=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0collocated ,= 2: Half)

Element Name: ChromaSitingVert
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0[55][B8]
Mandatory: =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Default:= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
Type: =C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Description: =C2=A0= How Chroma is subsampled vertically. (0: Unspecified, 1: Top
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0collocated , 2: Half)


Element = Name: Range
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A05
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0[55][B9]
Mandatory: =C2=A0=C2=A0= =C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
T= ype: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Description: =C2=A0Clipping of the color ranges.= (0: Unspecified, 1: Broadcast range,
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A02: Full range (no clipping), 3: Defined by
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0Matrix/TransferFunction)


Element = Name: TransferFunction

To align with ISO/IEC 23001-8, could we use Transfe= rCharacteristics?
Done.=C2=A0

Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= 5
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0[55][BA]
Mandatory: =C2=A0=C2=A0=C2=A0-
= Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A02
Type: =C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Descriptio= n: =C2=A0Transfer Function. See ISO/IEC 23001-8 for more information on
<= span style=3D"font-size:13.3333px;font-family:'Courier New';color:r= gb(34,34,34);font-weight:400;font-style:normal;font-variant:normal;text-dec= oration:none;vertical-align:baseline;white-space:pre-wrap;background-color:= rgb(255,255,255)"> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0enumerations. (0: Reserved, 1: ITU-R BT.709, 2: Uns= pecified,
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A03: Reserved, 4: Gamma 2.2 curve, 5: Gam= ma 2.8 curve,
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06: SMPTE 170M, 7: SMPTE 240M, 8: Lin= ear, 9: Log, 10: Log Sqrt,
=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A011: IEC 61966-2-4, 12= : ITU-R BT.1361 Extended Colour Gamut,
=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A013: IEC 6= 1966-2-1, 14: ITU-R BT.2020 10 bit,
=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A015: ITU-R BT= .2020 12 bit, 16: SMPTE ST 2084,
=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A017: SMPTE ST 42= 8-1 18: ARIB STD-B67 (HLG))

Comment:
The table in ISO/IEC 23001-= 8 for transfer characteristics does not include values or meaning for 16, 1= 7 and 18 as above. Are these values from ffmpeg's list?
16 and 17 is an artifact form the FFmpeg list, but also= form looking at FFmpeg CL's I think they are defined in an h265 spec. = 18 is a proposed value for HLG.


Suggested description = edit:
The transfer characteristics of the video. For clarity, the= value and meanings for=C2=A0TransferCharacteristics=C2=A0are adopted from = Table 3 of ISO/IEC 23001-8:2013/DCOR1. (0: Reserved, 1: ITU-R BT.709, 2: Un= specified, 3: Reserved, 4: Gamma 2.2 curve, 5: Gamma 2.8 curve,=C2=A06: SMP= TE 170M, 7: SMPTE 240M, 8: Linear, 9: Log, 10: Log Sqrt,=C2=A011: IEC 61966= -2-4, 12: ITU-R BT.1361 Extended Colour Gamut,=C2=A013: IEC 61966-2-1, 14: = ITU-R BT.2020 10 bit,=C2=A015: ITU-R BT.2020 12 bit)
Done.
=C2=A0

Level: =C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A05
Mandatory: =C2=A0=C2=A0=C2=A0-<= /span>
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][BB]=
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A02
=
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Description: =C2=A0Values that can be represented in the CIE 193= 1 colour space. See
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ISO/IEC 23001-8 for more infor= mation on enumerations.
=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0(0: Reserved, 1: ITU-R B= T.709, 2: Unspecified, 3: Reserved,
=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A04: ITU-R BT.= 470M, 5: ITU-R BT.470BG, 6: SMPTE 170M, 7: SMPTE 240M,
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A08: FILM, 9: ITU-R BT.2020, 10: SMPTE ST 428-1)

Suggested description= edit:
The colour primaries of the video. For clarity, the value and mea= nings for TransferCharacteristics are adopted=C2=A0from Table 2 of ISO/IEC = 23001-8:2013/DCOR1. (0: Reserved, 1: ITU-R BT.709, 2: Unspecified, 3: Reser= ved, 4: ITU-R BT.470M, 5: ITU-R BT.470BG, 6: SMPTE 170M, 7: SMPTE 240M,=C2= =A08: FILM, 9: ITU-R BT.2020, 10: SMPTE ST 428-1)
Done.=C2=A0

Note that ISO/IEC 23001-8 also includes a value fo= r 22 for JEDEC P22 phosphors. Any reason to exclude this?
Added.
=C2=A0

Eleme= nt Name: MaxCLL
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A05
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0[55][BC]
Mandatory: =C2=A0=C2= =A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-<= /div>
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Description: =C2=A0Maximum brightness of a single pixel in candelas per = square
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0meter (cd/m=C2=B2).

Suggested:
= Maximum brightness of a single pixel (Maximum Content Light Level) in cande= las per square meter (cd/m=C2=B2).
Done<= /div>
=C2=A0
=

Element Name: MaxFALL
= Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A05
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0[55][BD]
Mandatory: =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Defau= lt: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u
Description: =C2= =A0Maximum brightness of a single full frame in candelas per square<= /div>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0meter (cd/m=C2=B2).
=

Suggested:
Maximum br= ightness of a single full frame (Maximum=C2=A0Frame-Average=C2=A0Light Leve= l) in candelas per square meter (cd/m=C2=B2).
Done
=C2=A0

Element= Name: MasteringMetadata
Level: =C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A05
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][D0]
Mandatory: = =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0= -
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0m
Description: =C2=A0SMPTE 2086 mastering data.


Element Name: PrimaryRChromaticityX
L= evel: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06
ID: = =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][D1]=
Mandatory: =C2=A0=C2=A0=C2=A0-
Multiple= : =C2=A0=C2=A0=C2=A0=C2=A0-
Range: =C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A00 <=3D f <=3D 1

I think "0.0-1.0"= is preferred for float range expressions.

Sorry there's an= open discussion elsewhere on Cellar about expressing float ranges as=C2=A0= hexadecimal floating-point literals, so this may be changed later, but the = meaning should still be the same.
No pro= blem. I just had it that way for brevity, much like a lot of my other descr= iptions. I don't want to add to much text to a cell of the Matroska spe= c table. :)


Done
=C2=A0

Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
= Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f<= /span>
Description: =C2=A0Red X chromaticity coordinate as d= efined by CIE 1931.


Element Name: PrimaryR= ChromaticityY
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A06
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0[55][D2]
Mandatory: =C2=A0=C2=A0= =C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 <=3D f &l= t;=3D 1
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f
<= span style=3D"font-size:13.3333px;font-family:'Courier New';color:r= gb(34,34,34);font-weight:400;font-style:normal;font-variant:normal;text-dec= oration:none;vertical-align:baseline;white-space:pre-wrap;background-color:= rgb(255,255,255)">Description: =C2=A0Red Y chromaticity coordinate as defi= ned by CIE 1931.


Element Name: PrimaryGChr= omaticityX
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A06
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0[55][D3]
Mandatory: =C2=A0=C2=A0=C2= =A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
<= div style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt">Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 <=3D f <= =3D 1
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-<= /div>
f
Description: =C2=A0Green X chromatic= ity coordinate as defined by CIE 1931.


E= lement Name: PrimaryGChromaticityY
Level: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A06
ID: =C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][D4]
M= andatory: =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0= =C2=A0=C2=A0-
Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A00 <=3D f <=3D 1
Default: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0f
Description: =C2=A0Green Y chr= omaticity coordinate as defined by CIE 1931.

<= br>
Element Name: PrimaryBChromaticityX
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A06
<= div style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt">ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55= ][D5]
Mandatory: =C2=A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Range: =C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 <=3D f <=3D 1
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
f=
Description: =C2=A0Blue X chromaticity coordinate as define= d by CIE 1931.


Element Name: PrimaryBChrom= aticityY
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A06
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0[55][D6]
Mandatory: =C2=A0=C2=A0=C2= =A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
<= div style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt">Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 <=3D f <= =3D 1
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-<= /div>
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f
Description: =C2=A0Blue Y chromaticity coordinate as defin= ed by CIE 1931.


Element Name: WhitePointCh= romaticityX
Level: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A06
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0[55][D7]
Mandatory: =C2=A0=C2=A0= =C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 <=3D f &l= t;=3D 1
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f
<= span style=3D"font-size:13.3333px;font-family:'Courier New';color:r= gb(34,34,34);font-weight:400;font-style:normal;font-variant:normal;text-dec= oration:none;vertical-align:baseline;white-space:pre-wrap;background-color:= rgb(255,255,255)">Description: =C2=A0White point X chromaticity coordinate= as defined by CIE 1931.


Element Name: Whi= tePointChromaticityY
Level: =C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A06
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][D8]
Mandatory: =C2= =A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 <= ;=3D f <=3D 1
Default: =C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0-
Type: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0f
Description: =C2=A0White point Y chromaticity= coordinate as defined by CIE 1931.


Elemen= t Name: LuminanceMax
Level: =C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A06
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][D9]
Mandatory: =C2= =A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 <= ;=3D f <=3D 9999.99
Defau= lt: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f
Description: =C2= =A0Maximum luminance. Shall be represented in candelas per square
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0meter (cd/m=C2=B2).


Elem= ent Name: LuminanceMin
Level: =C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A06
ID: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[55][DA]
Mandatory: =C2= =A0=C2=A0=C2=A0-
Multiple: =C2=A0=C2=A0=C2=A0=C2=A0-
Range: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 <= ;=3D f <=3D 999.9999
Defa= ult: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-
Type: =C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f
Description: = =C2=A0Minimum luminance. Shall be represented in candelas per square=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0meter (cd/m=C2=B2).



I removed ChromaSubsampling and added ChromaSubsamplingHorz, C= hromaSubsamplingVert, CbSubsamplingHorz, and CbSubsamplingVert.
<= br>
This is how I think the elements should be written for the di= fferent subsampling types:
1: 4:4:4
=C2=A0 =C2=A0 = - ChromaSubsamplingHorz and ChromaSubsamplingVert will not be set as there = should be no chroma subsampling.

2: 4:4:0
=C2=A0 - ChromaSubsamplingHorz :not set
=C2=A0 - ChromaSub= samplingVert :1

3: 4:2:2
=C2= =A0 - ChromaSubsamplingHorz :1
=C2=A0 - ChromaSubsamplingVert :no= t set

4: 4:2:1
=C2=A0 - Chrom= aSubsamplingHorz :1
=C2=A0 - ChromaSubsamplingVert :not set
=
=C2=A0 - CbSubsamplingHorz :1
=C2=A0 - CbSubsampl= ingVert :not set
=C2=A0 - We could remove CbSubsamplingHorz= and CbSubsamplingVert if we didn't care about handling formats where t= he Cr and Cb channels are different sizes.

I forgot about 4:2:1. That answers my q= uestion about CbSubsmaplingHorz though perhaps we need a narrative section = to expand on this with the examples you have here.

5: 4:2:0
=C2=A0 - ChromaSubsamplingHorz :1<= /div>
=C2=A0 - ChromaSubsamplingVert :1

6: 4:1= :1
=C2=A0 - ChromaSubsamplingHorz :3
=C2=A0 - Chro= maSubsamplingVert :not set

7: 4:1:0
=C2=A0 - ChromaSubsamplingHorz :3
=C2=A0 - ChromaSubsampli= ngVert :1

8: 3:1:1
=C2= =A0 - ChromaSubsamplingHorz :2
=C2=A0 - ChromaSubsamplingVert :no= t set
=C2=A0 - I'm assuming the luma subsampling can be= handled by PixelWidth, and DisaplyWidth.

Jerome&#= 39;s vertical subsampling of 4
=C2=A0 - ChromaSubsamplingHor= z :not set
=C2=A0 - ChromaSubsamplingVert :3

=


The other issue I want to bring up= is the value of "18: ARIB STD-B67 = (HLG)" in TransferFunction. Unfortunately, in WebM we will need= to use this value sooner than Matroska v4 will be finalized. Should I make= this value much higher? Or leave at 18? I think "16: SMPTE ST 2084" and "17: SMPTE ST 428-1" will be standardized across= most documents, like 1-15 are. Just not sure if 18 will be HLG.

I see a few references = to ARIB STD-B67 as 18, such as=C2=A0http://www.arib.or= .jp/english/html/overview/doc/2-STD-B32v3_5.pdf. Perhaps we need a cave= at that values 1-15 are defined based upon ISO/IEC 23001-8. Then for values= 16, 17, and 18 we could add better descriptions and citations to define it= better internally.
I'm fine with t= his. I'm just worried about the case where we diverge from one of the l= ists. Would be nice to have one canonical list.
=C2=A0
If (hopefully) a = revision to ISO/IEC 23001-8 adds those values (as expected) then we could u= pdate are description to say all values are defined by ISO/IEC 23001-8.
Sounds good to me.
<= /div>
It's a bit risky. Perhaps for now we s= hould clarify that values 1-15 are defined by=C2=A0ISO/IEC 23001-8 and then= give customized definitions for 16, 17, 18.
<= br>
Following Jerome's comment, =C2=A0how about this for Tran= sferCharacteristic:
"The transfer characteristics of the vid= eo. For clarity, the value and meanings for TransferCharacteristics 1-15 ar= e adopted from Table 3 of ISO/IEC 23001-8:2013/DCOR1. TransferCharacteristi= cs 16-17 are adopted from <265 doc> and 18 is the proposed value of A= RIB STD-B67. (0: Reserved, 1: ITU-R BT.709, 2: Unspecified, 3: Reserved, 4:= Gamma 2.2 curve, 5: Gamma 2.8 curve, 6: SMPTE 170M, 7: SMPTE 240M, 8: Line= ar, 9: Log, 10: Log Sqrt, 11: IEC 61966-2-4, 12: ITU-R BT.1361 Extended Col= our Gamut, 13: IEC 61966-2-1, 14: ITU-R BT.2020 10 bit, 15: ITU-R BT.2020 1= 2 bit, 16: SMPTE ST 2084, 17: SMPTE ST 428-1 18: ARIB STD-B67 (HLG))"<= /div>

Dave Rice



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