[Matroska-users] matroska / ffmpeg / bitrate

Steve Lhomme slhomme at matroska.org
Tue Jul 13 16:03:13 CEST 2010


On Tue, Jul 13, 2010 at 2:37 PM, startx <startx at plentyfact.org> wrote:

> On Tue, 13 Jul 2010 13:35:48 +0200
> Steve Lhomme <slhomme at matroska.org> wrote:
>
> > Matroska doesn't store the bitrate information as it may change when
> > editing the file (although such tools could theoretically update the
> > bitrate info accordingly).
>
> but isnt that true about any video container out there?
> my problem is this: i want to store many videos in high quality dirac
> (schroedinger) and of course i want to know what bitrate they had
> later when i access the archive.
>
> > It can be written as a tag, but noone supports reading or writing
> > this info yet.
>
> you mean as a tag in sense of a tag in the matroska xml file?
> in fact i was thinking of doing this as a workaround.
>
> what would that tag be? just
>         <Simple>
>            <Name>BITRATE</Name>
>            <String>6670</String>
>        </Simple>
>
> ?
>

Yes
You have to use a TrackUID target in the tag if you want to specify the
specific bitrate for a track. Otherwise it means the global file bitrate.
Which is also the file size divided by the duration.
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