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Old 08-24-2008, 02:03 PM   #1
Anithen
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Registered: Aug 2003
Location: Florida
Distribution: Slackware 12, Slackware 12.1, Slackware 12.2
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Feed multiple files into ffmpeg?


I've always done things, like

for i in *.mp3; do mpg321 -w `basename $i .mp3`.wav $i; done

but for ffmpeg how can I encode many videos at once?

for i in *.3gp; do ffmpeg $i -f avi -vcodec libxvid -acodec libmp3lame `date +%H%M%S%N`.avi; done

Does not work, because ffmpeg uses the 2nd match as the output file, and asks me if I want to write over it.

From within a directory full of 3gp files, I ran

find . -iname "*.3gp" -print -exec ~/nastiness/3gp2avi.sh {} \;

, and 3gp2avi.sh contains

#!/bin/bash ffmpeg $1 -f avi -vcodec libxvid -acodec libmp3lame `date +%H%M%S%N`cv.avi

This attempt also does not work. Strangely, even using 3gp2avi.sh by itself on 1 file ffmpeg tries using the filename as the output file filename. If I type the whole ffmpeg command one by one for each 3gp file it works, though.

If anyone can help me do something like "for i in *3gp; do..." with ffmpeg I'd greatly appreciate it. Thanks.

Last edited by Anithen; 08-24-2008 at 04:41 PM. Reason: clarification
 
Old 08-24-2008, 11:40 PM   #2
David the H.
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The command should be 'ffmpeg -i "$i" etc..'. I'd also put the variable in quotes, especially if the filenames contain spaces or other illegal characters. Same goes for the output file string.
 
Old 08-25-2008, 01:13 AM   #3
Anithen
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Registered: Aug 2003
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Thanks, David the H. I can't believe I missed the -i. It's in my bash history. I must've weeded it out accidentally during testing. One thing I wouldn't have tried is using "$i" vs $i, so thank you for your help.

My final command is

for i in *.3gp; do ffmpeg -i "$i" -f avi -vcodec libxvid -acodec libfaac -ar 22050 `basename $i .3gp`-`date +%H%M%S%N`.avi; done
 
  


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