[FFmpeg-devel] [PATCH 2/6] dvdsubenc: make it usable for transcoding.

Clément Bœsch ubitux at gmail.com
Tue Aug 7 22:37:52 CEST 2012

On Tue, Aug 07, 2012 at 10:21:30PM +0200, Nicolas George wrote:
> Le primidi 21 thermidor, an CCXX, Clément Bœsch a écrit :
> > I'd like to look at this patchset and especially this patch deeper if you
> > give me some time a bit. But just before:
> No problem. AFAIK, it has never worked, it can wait a few more days.
> > Would it make sense to use that extradata to store for instance the
> > content of a .IDX (associated with a vob .SUB)?
> Actually, that is exactly what is present in the extradata according to the
> Matroska spec: the contents of the IDX except what can be stored in the file
> structure itself (timestamp lines become the timestamp of packets, id
> becomes the language metadata, that leaves palette, size, addressed in that
> patchset, and forced subs, which is more or less useless).

Ah interesting. No need for a particular header like "# VobSub index file,

> > AFAIK FFmpeg has no support for vobsub, and it might be necessary for a
> > classic DVD rip workflow.
> True. I started a vobsub muxer last year but never got to finish it.

...or actually maybe that's the responsibility of that VobSub muxer to do
that? Just like it would add the timestamp and filepos text entries?

> DVD subtitles muxed in Matroska are more or less equivalent to the vobsub
> file pair, though. At worst, mkvextract can rebuild the vobsub file pair for
> compatibility.
> The real problem for DVD ripping with ffmpeg is reading the DVD structure,
> though, especially extracting the palettes and languages from the IFO file.
> There was a patch to add support for libdvdnav, just like libbluray, but it
> was never finished, unfortunately.

http://ffmpeg.org/pipermail/ffmpeg-devel/2012-January/119842.html ?

It might be interesting to coordinate work on this.

Stefano, in case you don't have time for this, do you remember the main
issues you wanted to fix? Playlist stuff I guess?

> > I must say I have no idea yet what really is the state of FFmpeg on that
> > regard and it looks like you have a better overview... :)
> I hope this answers your question.

Yup thank you.


Clément B.
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