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

[Clément Bœsch]

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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