[Matroska-devel] Colour Format proposal

Michael Bradshaw mjbshaw at google.com
Tue Jan 5 22:33:32 CET 2016


On Tue, Jan 5, 2016 at 1:12 PM, Frank Galligan <frankgalligan at gmail.com>
wrote:
>
> Element Name: ChromaSubsampling
> Level:        5
> ID:           [55][A3]
> Mandatory:    ma
> Multiple:     -
> Default:      0
> Type:         u
> Description:  (0: 4:2:0, 2: 4:2:2, 4: 4:4:4)
>
>
FFmpeg supports more subsampling schemes like 4:1:0, 4:1:1, and 4:4:0.

Additionally, these formats assume 3-channel pixel formats. What about an
alpha-channel or other color spaces with > 3 channels?

Perhaps a per-channel master element could exist that contains subsampling
and bit information?
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