[FFmpeg-user] Problem with Select Filter

Paul B Mahol onemda at gmail.com
Fri Aug 9 14:57:09 CEST 2013

On 8/9/13, James Board <jpboard2 at yahoo.com> wrote:
> I start with a raw AVI file that has been Inverse Telecined and single
> frames
> were compressed with lossless codec ffvhuff.  Then I apply the Select
> filter
> to do some cut edits on the video.  An example command is this:
>     ffmpeg -i IN.avi select='-between(n\, 10\,
> 10000)',setpts=N/FRAME_RATE/TB
>         -c:v ffvhuff -af aselect='-between(n\, 10\, 10000)',asetpts=N/SR/TB
>         -c:a wmav2 OUT.avi

The above command is missing "-vf", is this true?
> Then I later mpeg4 encode it with mencoder (for Carl, I will use ffmpeg
> instead of mencoder once I figure out how to do that without error).  Then
> I
> play the file.  The problem is when I seek forward 10 seconds, or a minute,
> there's often a 2 or 3 second delay once I get to the seek frame.  The
> video
> freezes for 2 or 3 seconds.

Perhaps pts are wrong. For simple cut you can use trim & atrim filters.

> This problem doesn't happen if I omit the above ffmpeg step (where I do Cut
> Edits with the Select filter).  So, something isn't right with the way I'm
> using ffmpeg to do cut edits, or with the ffmpeg select filter, or
> whatever.
> Can anyone see anything wrong with the above ffmpeg command?  Maybe
> the setpts or asetpts stuff, which I don't understand?  Does anyone know
> how to figure this problem out?
> Thank you.
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