[FFmpeg-user] Inaccurate trimming with re-encoding

James Board jpboard2 at yahoo.com
Mon Aug 5 18:07:55 CEST 2013

I'm able to do frame-exact editing with ffmpeg.  It's described in this thread: 


The command is something like this (thanks to Carl Lindqvist)
ffmpeg -i SOURCEFILE.avi -vf
-c:v libx264 -preset veryfast -b:v 700k -profile:v main -af
aselect='-between(n,0,100)-between(n,130,200)',asetpts=N/SR/TB -c:a
libvo_aacenc -b:a 96k -ac 2 OUT.mp4
I verified that the frames are exactly what I wanted by checking the md5sums of each frame.

My input avi file used a raw codec with no inter-frame compression.  I'm not sure if frame-exact editing will work when the input file is compressed with mpeg-like codecs.

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