Having managed to write a small program to read an mp4 and convert it to
flv using the Libav API.  There are a couple of questions I need
clarified:

 

1) I would like to force the output key spacing to be every 40 frames -
how can I do this?

2) I have also noticed that if I only process half the input file, the
Duration written into the output file is the original FULL duration of
the input file!  How can I insist that the Duration written reflects the
length of the output file I have created?

Thanks in advance

Gary

 

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