[FFmpeg-user] ffmpeg whole directory file conversion question

Carl Zwanzig cpz at tuunq.com
Fri Mar 1 07:36:06 EET 2019

On 2/28/2019 5:12 PM, Ashley Smiley wrote:
> If I use the code you sent:
> for f in *.mp4; do ffmpeg -i "$f" "$f_%03d.png"; done
> what I get is:
> 001.png
> 002.png

Try this--
   for f in *.mp4; do ffmpeg -i "$f" "${f}_%03d.png"; done

(assuming bash shell)
without the {}, the second $f disappears because the underscore is 
considered part of the variable name, i.e. variable "f_". If you used a 
different separator character, this won't happen. (Always surround a var 
name with {} when its used inside a string.)

The " also aren't needed unless there are spaces in the file names.

However.... you'll get filenames formed from "Sign_Off_clean.mp4_%03d.png" 
with the ".mp4" in them.

If there aren't any spaces in the file names--
    for f in `ls *.mp4 | sed -e 's/.mp4//'`; do ffmpeg -i "$f" 
"${f}_%03d.png"; done

ought do Do The Right Thing.

Past that, it's a shell scripting problem, not an ffmpeg one.

(please don't top-post on this list)



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