On Wed, Feb 3, 2010 at 11:21 AM, Chris Double <chris.double at double.co.nz> wrote:> Excerpts from Frank Barchard's message of Wed Feb 03 13:11:15 +1300 2010: >> >> Yes, and its good to learn from DVD's too.DVD is a subpart of MPEG: http://www.mpucoder.com/DVD/vobov.html, http://dvd.sourceforge.net/dvdinfo/dvdmpeg.html . Uses the same functionality for tracks, iiuc.> It might be useful to look at the Matroska container format too. It handle's multiple tracks iirc.Matroska is interesting, see http://www.matroska.org/technical/specs/index.html#Track . It has a TrackNumber and a TrackUID (the latter probably maps well onto Ogg serialnumbers) and a Name (human-readable). Further for display order it has a TrackOverlay element, which specifies a track to be an overlay onto another one. Cheers, Silvia.
On Mac the ffmpegx tool supports 2 audio tracks. Maybe worth checking out? http://www.ffmpegx.com/index.html - Creates AVI or MPG files with two audio tracks. - *Supports subtitles* in VobSub, SubRip, MicroDVD, SubViewer, Sami, VPlayer, RT, SSA, AQTitle, JACOsub and MPsubt formats On Tue, Feb 2, 2010 at 5:40 PM, Silvia Pfeiffer <silvia at silvia-pfeiffer.de>wrote:> On Wed, Feb 3, 2010 at 11:21 AM, Chris Double <chris.double at double.co.nz> > wrote: > > Excerpts from Frank Barchard's message of Wed Feb 03 13:11:15 +1300 2010: > >> > >> Yes, and its good to learn from DVD's too. > > DVD is a subpart of MPEG: http://www.mpucoder.com/DVD/vobov.html, > http://dvd.sourceforge.net/dvdinfo/dvdmpeg.html . > Uses the same functionality for tracks, iiuc. > > > It might be useful to look at the Matroska container format too. It > handle's multiple tracks iirc. > > Matroska is interesting, see > http://www.matroska.org/technical/specs/index.html#Track . > > It has a TrackNumber and a TrackUID (the latter probably maps well > onto Ogg serialnumbers) and a Name (human-readable). > > Further for display order it has a TrackOverlay element, which > specifies a track to be an overlay onto another one. > > Cheers, > Silvia. > _______________________________________________ > ogg-dev mailing list > ogg-dev at xiph.org > http://lists.xiph.org/mailman/listinfo/ogg-dev >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/ogg-dev/attachments/20100203/e7ce98c2/attachment-0001.htm
> On Mac the ffmpegx tool supports 2 audio tracks. Maybe worth checking out?[...]> - Creates AVI or MPG files with two audio tracks.If it's for creating, then oggz-merge or Thoggen support more than one audio track. While ffmpeg2theora does not, it is easy to work around this by encoding audio only for each remaining audio track, then merge the result. For playing, VLC works fine with more than one audio track in Ogg too. Not sure why the blurb says "two audio tracks" though, rather than "more than one".
What would the creation of a AVI or MPG with 2 audio tracks tell me that I don't know yet? I can just use normal ffmpeg for that - ffmpegx is just a GUI transcoding tool based on ffmpeg and the latest ffmpegx release is more than 2 years old. Anyway, I did look at the AVI spec after this email (http://msdn.microsoft.com/en-us/library/dd318183%28VS.85%29.aspx) and found that while each track has a type and a language, there is no track numbering and there are no track identifiers. But I have found a track priority, which allows ordering the tracks, though I didn't find a single AVI file with nonzero wPriority. Cheers, Silvia. On Thu, Feb 4, 2010 at 6:57 AM, Frank Barchard <fbarchard at google.com> wrote:> On Mac the ffmpegx tool supports 2 audio tracks. ?Maybe worth checking out? > http://www.ffmpegx.com/index.html > > Creates AVI or MPG files with two audio tracks. > Supports subtitles?in VobSub, SubRip, MicroDVD, SubViewer, Sami, VPlayer, > RT, SSA, AQTitle, JACOsub and MPsubt formats > > On Tue, Feb 2, 2010 at 5:40 PM, Silvia Pfeiffer <silvia at silvia-pfeiffer.de> > wrote: >> >> On Wed, Feb 3, 2010 at 11:21 AM, Chris Double <chris.double at double.co.nz> >> wrote: >> > Excerpts from Frank Barchard's message of Wed Feb 03 13:11:15 +1300 >> > 2010: >> >> >> >> Yes, and its good to learn from DVD's too. >> >> DVD is a subpart of MPEG: http://www.mpucoder.com/DVD/vobov.html, >> http://dvd.sourceforge.net/dvdinfo/dvdmpeg.html . >> Uses the same functionality for tracks, iiuc. >> >> > It might be useful to look at the Matroska container format too. It >> > handle's multiple tracks iirc. >> >> Matroska is interesting, see >> http://www.matroska.org/technical/specs/index.html#Track . >> >> It has a TrackNumber and a TrackUID (the latter probably maps well >> onto Ogg serialnumbers) and a Name (human-readable). >> >> Further for display order it has a TrackOverlay element, which >> specifies a track to be an overlay onto another one. >> >> Cheers, >> Silvia. >> _______________________________________________ >> ogg-dev mailing list >> ogg-dev at xiph.org >> http://lists.xiph.org/mailman/listinfo/ogg-dev > >