[FFmpeg-devel] [RFC]Add int64_t probesize2 to AVFormatContext

[wm4]

On Mon, 28 Jul 2014 10:43:13 +0200
Nicolas George <george at nsup.org> wrote:

> Le decadi 10 thermidor, an CCXXII, Eli Kara a écrit :
> > It would solve the problem for DVDs with structure, which is probably what
> > most people have when they rip a DVD.
> 
> Certainly. But the other scenarios where the user only have a big MPEG-PS
> file and nothing else, are likely too.
> 
> > Just out of curiosity - why isn't DVD/BR reading implemented in FFmpeg? Is
> > it because of the encryption that needs to be cracked?
> 
> Nothing of the sort. lavf supports reading Blu Ray discs since March 2012.
> But DVDs are much more difficult, because they pile up a crappy format on
> top of another even-more-crappy format, with additional braindeadness to
> boot. Fortunately, the Blu Ray guys hired more competent developers to
> design their formats -- I only wish they kept the incompetent crypto guys.

I don't see how Bluray is less braindead than DVD. Some things are
slightly better, but after all it's a similar approach (raw packet
stream + additional metadata).

> I can add that I committed in April a script that allows ffmpeg to partially
> access DVD-Video structures directly. That is a hack, it uses the concat
> demuxer to stitch the VOB files together, lacks a lot of features from the
> DVD structure (language metadata, palette for  the subtitles, chapters), and
> requires an external tool with non-standard patches, but in the meantime I
> suppose it can be of some use.
> 
> I suspect the problem with the undetected subtitle stream that started this
> thread could be worked around with a similar concat script.
> 
> But that does not replace real support for DVD-Video.
> 
> Regards,
>