[Matroska-devel] [Cellar] Colour Format proposal

Frank Galligan frankgalligan at gmail.com
Wed Jan 6 23:00:35 CET 2016


On Tue, Jan 5, 2016 at 1:54 PM, Dave Rice <dave at dericed.com> wrote:

>
> On Jan 5, 2016, at 4:12 PM, Frank Galligan <frankgalligan at gmail.com>
> wrote:
>
> Hello all,
>
> I would like to bring up the discussion again about better representing
> the color format of video. It looks like the discussion was started here
> [1] on matroska-devel list. I think we need to add some Colour elements so
> Matroska files can (potentially) more faithfully represent the video source
> on many devices. Here is a proposal I created to start from:
>
>
> Element Name: Colour
> Level:        4
>
>
> Please clarify the proposed Parent Element.
>
> [...]
>
Sorry. The parent element would be Video [E0].


>
> Element Name: ColourMatrix
> Level:        5
> ID:           [55][A1]
> Mandatory:    ma
> Multiple:     -
> Default:      2
> Type:         u
> Description:  ColourMatrix of the video. (0: IEC 61966-2-1 (sRGB), 1:
> BT709,
>               2: Unspecified,
>
>
> Any reason for "Unspecified" to be #2 rather than #0? Do these numbers
> align with a FFmpeg/libav enumeration?
>
> [...]
>
Yes (and what Jerome mentioned)


>
> 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)
>
>
> This is mandatory, but there is no Unspecified option. If I want to
> clarify that a contained 4:1:1 DV stream uses bt.601 there is no valid way
> to say this, since if ColourMatrix is used then ChromaSubsampling must also
> be used, but there is no options that fit 4:1:1.
>
> [...]
>
That was an omission on my part. I added Unspecified as well as 4:1:1 in a
previous email.

>
>
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