[FFmpeg-user] Vorbis/Ogg duration

[John Mucha]

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On Jan 10, 2012 5:51 PM, "Austen McRae" <austen.mcrae at gmail.com> wrote:

> Hey all,
>
> I'm attempting to figure out if there is a header component of Vorbis (or
> its container Ogg) that specifies the the audio duration.  My current make
> of ffmpeg doesn't seem to place any type of duration information; when I
> play it back using VLC it plays but the duration is 00:00, but I've been
> able to find additional ogg vorbis files that do have a duration component
> in VLC (which was exported from Quicktime).
>
> Looking at the Ogg source files shows that the OGGStreamContext doesn't
> really have a duration option, but it looks like we could add it using an
> OggComment?  I did attempt to add it using the -metadata tag, but VLC
> didn't pick up "duration" or "length" produced unplayable files...
>
> Any additional knowledge as to how the duration is encoded would be great!
>
> Sincerely,
>
> Austen
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