[Matroska-devel] New Matroska field: chroma range/pixel format

wm4 nfxjfg at googlemail.com
Wed Sep 23 21:27:16 CEST 2015


On Wed, 23 Sep 2015 18:00:58 +0200
Steve Lhomme <slhomme at matroska.org> wrote:

> We currently have a ColourSpace field that is just mapped from AVI.
> I'm not even sure it's used.

Raw video. Might be FFmpeg specific.

> When storing raw video, the pixels are stored in a certain way and
> decoding the pixels need some conversion from this encoding to
> whatever your screen is using. Right now we don't have all the fields
> needed to describe these raw data.
> 
> It may also be useful to tell easily if a H264 or VP9 video is in 8
> bits per pixels, 10 or 12 bits, without having to inspect codec
> private data or even Blocks.
> 
> I think a field for Chroma Subsampling (I420, I422, Y410, etc) and one
> for Chroma Range (BT.608, BT.709, BT.2020) should be sufficient. The
> Chroma Subsampling generally described how each "plane" is layed out
> in the raw data.

That kind of redundant info just seems to make everything harder than
it is...


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