[Matroska-devel] WebM 2

Michael Bradshaw mjbshaw at google.com
Mon Oct 31 17:28:50 CET 2016

Correct me if I'm wrong, Frank, but AFAIK the WebM DocTypeVersion and
DocTypeReadVersion correspond to which version of Matroska elements are
being used. For example, consider the Opus WebM streams in the YouTube
video https://www.youtube.com/watch?v=SkVqJ1SGeL0

The DocTypeVersion is 4 and the DocTypeReadVersion is 2. If you remux the
Opus WebM track with FFmpeg (either as WebM or Matroska) then FFmpeg will
also write a DocTypeVersion of 4 and a DocTypeReadVersion of 2.

On Sun, Oct 30, 2016 at 2:26 AM, Steve Lhomme <slhomme at matroska.org> wrote:

> Hi,
> The other day I noticed some WebM files now have the DocTypeVersion
> and ReadDocTypeVersion set to 2.
> Is there a documentation that explains the differences between v1 and
> v2 ? Maybe the addition of VP9 and Opus ?
> --
> Steve Lhomme
> Matroska association Chairman
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