[Matroska-devel] Specification Changes

Steve Lhomme slhomme at matroska.org
Sun Sep 23 11:49:32 CEST 2012

PS: just to clarify things, Matroska v4 is still a work in progress.

On Sun, Sep 23, 2012 at 11:39 AM, Steve Lhomme <slhomme at matroska.org> wrote:
> Hello everyone,
> Following recent discussions we have introduce Matroska v4. It is
> backward and forward compatible with previous versions.
> New elements:
> - CueDuration and CueRelativePosition so that matching subtitle blocks
> can be retrieved easily when seeking
> - TimecodeScaleDenominator which gives the Segment timecode in seconds
> with the fraction TimecodeScale/TimecodeScaleDenominator. The value
> 1,000,000,000 ensures that the regular TimecodeScale values have the
> same meaning as before.
> Deprecated element:
> - TrackTimecodeScale which was meant to combine tracks from different
> timecode clocks (like PAL audio with NTSC video) but is bogus because
> the Block timecodes have to be stored in sync with matching timecodes.
> It shouldn't be up to the player to stretch audio or video time so
> that they match. In the case of stretching audio that's quite tricky.
> CueBlockNumber may be another candidate for deprecation now that we
> have CueRelativePosition which is more convenient and faster. I'm not
> sure it's used at all when writing or by any player.
> --
> Steve Lhomme
> Matroska association Chairman

Steve Lhomme
Matroska association Chairman

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