[FFmpeg-user] to crop the bottom

Stefano Sabatini stefasab at gmail.com
Fri Nov 18 00:44:29 CET 2011

On date Thursday 2011-11-17 18:16:41 -0500, Jim Shupert encoded:
> friends,
> I wish to crop off the bottom 40 lines of a 720x480 video  and have
> the output 720x480
> actually i wish to simply crop off the bottom 5 or 8 lines - but
> used 40 so the effect would be bold.
> i think my command is not doing anything.
> I do not wish to reencode - but simply trim off the bottom.
> I found the "old way( -cropbottom NN " simple - but i seem to not be
> able to make the -vf way work
> Thanks
> ffmpeg -i 1.mp4 -vf crop=720:480:0:40 -vcodec copy -acodec copy 2.mp

filtering is disabled with -vcodec copy, we should really make ffmpeg
more verbose about this.
ffmpeg-user random tip #9
One minute of audio silence with ffmpeg:
ffmpeg -ar 48000 -t 60 -f s16le -acodec pcm_s16le -i /dev/zero  \
    -ab 64K -f mp2 -acodec mp2 -y silence.mp2

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