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• Bash while loop wait until task has completed

  30 juillet 2015, par macmichael01

  I have a bash script that I created to process videos from within a folder and it’s subfolders :

  find . -type f -name '*.mkv' | while read file;
  
  do
  
    ffmpeg -i $file ...
  
  done

  The problem : Instead of the while loop waiting ffmpeg to complete, it continues iterate through the loop. The end result is, files not getting processed. I need a way to have the current while loop iteration to wait until ffmpeg is complete before continuing to the next. Or alternatively a way to queue these items.

  Edit : So The solution when iterating over a set of files is to pass the -nostdin param to ffmpeg. Hope this helps anyone else who might have a similar issue.

  Also file —> $file was a copy/paste typo.

• Adding loop video to sound ffmpeg

  19 décembre 2017, par Cuviline

  i start working with ffmpeg, and here my first doubt :

  I have one sound file, example.mp3 (1 min duration).
  I want add a loop video, example.mp4 ( x sec duration).

  I want generate 1 min mp4 video and loop this video 3 times in this case, but this could be dynamic.

  Its posible do this with ffmpeg ?

  Thanks in advance

• FFMPEG vstack and loop

  6 mars 2020, par Tasurnin

  I would like to stack 4 videos as in the code below and add a loop for top_left.mp4 that is shorter for example.
  I can’t find a way to add the loop option without getting errors.
  Could you help me please ?

  ffmpeg -i top_left.mp4 -i top_right.mp4 -i bottom_left.mp4 -i bottom_right.mp4 \ 
  
         -lavfi "[0:v][1:v]hstack[top];[2:v][3:v]hstack[bottom];[top][bottom]vstack" \
  
          2by2grid.mp4