[FFmpeg-user] Problem converting from FLV to MP4

[Carl Eugen Hoyos]

Fernando Martinelli <fernando.martinelli <at> gmail.com> writes:

> Although I managed to do that, some of my videos are changing a lot their
> lengths, which is causing Audio-Video synchronization problems (as I'm
> merging audio streams independently with SOX and merge audio and video at
> the end).

Why don't you process audio and video together?
There will be samples where this is needed to keep A/V sync.

> PS: Here is the command I'm using to convert the flv files and the
> information of the input and output files (input has length 11:25 BUT
> output 11:46)

Please post complete, uncut console output together with your command 
line and if the problem is also reproducible without external 
libraries use -vcodec mpeg4.

Carl Eugen