[FFmpeg-devel] [PATCH] lavf/concatdec: fix timestamp conversion

Stefano Sabatini stefasab at gmail.com
Wed Nov 19 11:58:54 CET 2014

On date Wednesday 2014-11-19 11:47:53 +0100, Nicolas George encoded:
> Le nonidi 29 brumaire, an CCXXIII, Stefano Sabatini a écrit :
> > I'm concatenating samples with different time bases. Apparently
> > concatdec is setting the first stream timebase as the overall
> > timebase, and always assuming the timebase is shared for all the input
> > files.
> Concatenating segments with different settings is not currently supported,
> and that includes the time base. But inconsistencies are not detected
> either.
> For the time base specifically, I suppose implementing the conversion and a
> smart time base selection would be enough. With just the conversion, you
> might get lucky if the time base of the first segment is accurate enough.

> I do not object to the patch implementing the conversion, it will be needed
> at some point anyway to support segments with different settings, but a
> comment that this is incomplete would probably be a useful remainder.

I agree. At the moment nor the code nor the documentation mentions
this. Ideally the library should complain in case different settings
are detected.

As for the timebase issue, probably a workaround can be found using a
settb filter.
FFmpeg = Friendly & Fanciful Miracolous Picky Educated Gargoyle

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