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Re: [Hls-interest] coming to Apple HLS clients later this year: M-JPEG support

Roger Pantos <rpantos@apple.com> Wed, 23 February 2022 18:06 UTC

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From: Roger Pantos <rpantos@apple.com>
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Date: Wed, 23 Feb 2022 10:06:09 -0800
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To: Alex Giladi <alex.giladi@gmail.com>
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Subject: Re: [Hls-interest] coming to Apple HLS clients later this year: M-JPEG support
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Hi Alex. A platform with a software decoder for individual HEVC images can in principle consume I-frame playlists containing HDR10 / Dolby Vision / HLG segments.


Roger. 

> On Feb 23, 2022, at 10:01 AM, Alex Giladi <alex.giladi@gmail.com> wrote:
> 
> Hi Roger,
> What do we do for HDR? Any plans for HEIF?
> Best,
> Alex.
> 
> On Wed, Feb 23, 2022 at 10:04 AM Roger Pantos <rpantos=40apple.com@dmarc.ietf.org <mailto:40apple.com@dmarc.ietf.org>> wrote:
> Hi folks. This is just a quick heads-up to let you know that in an OS release later this year, the Apple HLS clients will be updated to support Motion-JPEG fMP4 segments (i.e. JPEG images inside fMP4 containers). This will allow you to provide I-frame playlists (for both VOD and live content) that contain JPEG I-frames, rather than AVC or HEVC as previously supported.
> 
> We're doing this to support interoperability with lower-end devices from other manufacturers that cannot spawn a second video decoder instance, but can decode JPEG in software.
> 
> M-JPEG is specified in ISO/IEC 23008-12 "High efficiency coding and media delivery in heterogeneous environments —Part 12: Image File Format."  The 4cc codec type is 'mjpg' with no parameters (http://mp4ra.org/#/codecs <http://mp4ra.org/#/codecs>), So an example EXT-X-I-FRAME-STREAM-INF would be:
> 
> #EXT-X-I-FRAME-STREAM-INF:BANDWIDTH=331000,CODECS="mjpg",URI="iframe_index.m3u8"
> 
> We also plan to update our mediafilesegmenter tool to enable it to produce M-JPEG fMP4 segments from JPEG source.
> 
> 
> regards,
> 
> Roger Pantos
> Apple Inc.
> -- 
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