[FFmpeg-devel] [PATCH 2/2] Adding AlphaMode element to Matroska Parser

[Hendrik Leppkes]

On Tue, Feb 5, 2013 at 12:17 AM, Vignesh Venkatasubramanian
<vigneshv at google.com> wrote:
> Adding support for parsing AlphaMode element in the Track header
> and export that information as a metadata tag. This flag indicates
> presence of alpha channel data in BlockAdditional element.
>

I see no mention of this in the Matroska spec, or any discussion
related on the matroska mailing list?
Before inventing new ids, it should be standardized in the Matroska
spec, imho, or you'll end up with files that only work properly in
ffmpeg, for example.