[Matroska-devel] (no subject)

Steve Lhomme slhomme at matroska.org
Mon Mar 2 08:57:28 CET 2015

On 28/02/2015 03:39, Chris Cunningham wrote:
> + Steve, author of this addition.

Hi everyone,

The change was made following this discussion to handle alt-ref frames 
in VP8 at the container level.


> On Fri, Feb 27, 2015 at 6:27 PM Chris Cunningham
> <chcunningham at google.com <mailto:chcunningham at google.com>> wrote:
>     Hey Matroska!
>     First, let me apologize if I'm asking an answered question. The
>     mailing list search function is a bad link
>     <http://lists.matroska.org/swish/swish.cgi>.
>     I work on Chromium Media and we've seen a little confusion from
>     content creators around a line that was added
>     <https://github.com/Matroska-Org/foundation-source/commit/d3931e8f58898b9d673661fd7221b4704ffc917b>
>     to the Matroska spec
>     <http://www.matroska.org/technical/specs/index.html> for
>     BlockDuration (and whether it should be used in WebM):
>     "When set to 0 that means the frame is not a keyframe."
>     Just curious about the history/motivations for this. WebM's
>     container guidelines don't mention this and AFAIK WebM (de)muxers
>     just use ReferenceBlocks ... is there an edge-case where that
>     doesn't work out?
>     Thanks,
>     Chris

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