Re: [AVTCORE] [Technical Errata Reported] RFC2435 (4096)

Magnus Westerlund <magnus.westerlund@ericsson.com> Thu, 29 January 2015 13:06 UTC

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Date: Thu, 29 Jan 2015 14:06:34 +0100
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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Subject: Re: [AVTCORE] [Technical Errata Reported] RFC2435 (4096)
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Julius,

I would appreciate some clarification on the Errata. Is this an attempt
to raise a discussion around an improvement here, or something else?

Because without clarification this Errata will be rejected as makes no
correction.

/Magnus Westerlund


On 2014-09-04 17:26, RFC Errata System wrote:
> 
> The following errata report has been submitted for RFC2435,
> "RTP Payload Format for JPEG-compressed Video".
> 
> --------------------------------------
> You may review the report below and at:
> http://www.rfc-editor.org/errata_search.php?rfc=2435&eid=4096
> 
> --------------------------------------
> Type: Technical
> Reported by: Julius Richard Friedman <juliusfriedman@gmail.com>
> 
> Section: Discussion
> 
> Original Text
> -------------
>  types  component samp. fact. samp. fact. table number
>          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>          |       |  1 (Y)  |     2     |     1     |     0     |
>          | 0, 64 |  2 (U)  |     1     |     1     |     1     |
>          |       |  3 (V)  |     1     |     1     |     1     |
>          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>          |       |  1 (Y)  |     2     |     2     |     0     |
>          | 1, 65 |  2 (U)  |     1     |     1     |     1     |
>          |       |  3 (V)  |     1     |     1     |     1     |
>          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> 
> 
> Corrected Text
> --------------
> TO BE DETERMINED
> 
> Notes
> -----
> types  component samp. fact. samp. fact. table number
>         FROM StartOf Frame (0xFFC0)
> 
> Read Nf - Number of image components in frame
> 
> if(Nf > 1) 
> 
> Read Each Component
> 
>           0 1 2 3 4 5 6 7 
>          +-+-+-+-+-+-+-+-+
>          |   H   |   V   |
>          +-+-+-+-+-+-+-+-+
> 
> H: Horizontal sampling factor – Specifies the relationship between the component horizontal dimension
> and maximum image dimension X (see Jpeg Spec A.1.1); also specifies the number of horizontal data units of component
> Ci in each MCU, when more than one component is encoded in a scan.
> Vi: Vertical sampling factor – Specifies the relationship between the component vertical dimension and
> maximum image dimension Y (see Jpeg Spec A.1.1); also specifies the number of vertical data units of component Ci in
> each MCU, when more than one component is encoded in a scan.
> Tqi: Implied from the position in parsing
> 
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party (IESG)
> can log in to change the status and edit the report, if necessary. 
> 
> --------------------------------------
> RFC2435 (no draft string recorded)
> --------------------------------------
> Title               : RTP Payload Format for JPEG-compressed Video
> Publication Date    : October 1998
> Author(s)           : L. Berc, W. Fenner, R. Frederick, S. McCanne, P. Stewart
> Category            : PROPOSED STANDARD
> Source              : Audio/Video Transport
> Area                : Real-time Applications and Infrastructure
> Stream              : IETF
> Verifying Party     : IESG
> 
> 
> 
> _______________________________________________
> Audio/Video Transport Core Maintenance
> avt@ietf.org
> https://www.ietf.org/mailman/listinfo/avt
> 

-- 

Magnus Westerlund

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