[FFmpeg-devel] Would like to work on lavf-based concatenation tool for GSoC qualification

Michael Niedermayer michaelni
Tue Mar 31 17:17:04 CEST 2009

On Tue, Mar 31, 2009 at 06:10:13PM +0300, Kostya wrote:
> On Tue, Mar 31, 2009 at 03:26:37PM +0100, Robert Swain wrote:
> > On 31/3/09 15:00, Geza Kovacs wrote:
> > >I'd like to know, by "concatenation" I assume this means "without
> > >re-encoding"; therefore I assume I'm not supposed to handle situations
> > >when multiple files are encoded with different framerate settings or
> > >different codecs (or do I instead transcode them into an intermediate
> > >format in these situations?).
> > 
> > Concatenate means to link to together. I'm not sure what the plans are 
> > for handling differences in frame rates or resolutions. Differing source 
> > formats shouldn't matter for transcoding purposes as long as on entry to 
> > the video encoder the resolution, frame rate and pixel format as all 
> > appropriate and similarly the number of channels, sample rate and sample 
> > format for the audio encoder, there shouldn't be any major problem.
> > 
> > I expect Baptiste will elaborate on this. I think he had plans to allow 
> > specification of command line options per input so that one could affect 
> > the different inputs to make them concatenate-able.
> That's rather for full GSoC task (enhancing FFmpeg). Small task is writing
> simple tool for at least reading data in the same format and write it to
> output. Enhancing it would be good and ease GSoC task.

Id like to add that doing a full gsoc task in a few days also counts as
passing qualification tests!


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

While the State exists there can be no freedom; when there is freedom there
will be no State. -- Vladimir Lenin
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