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• How to execute this ffmpeg command for multiple videos is a folder on Linux terminal

  3 février 2023, par average_grad_student

  I'm trying to change the framerate of my video to 15fps and I need to do that for 100+ videos that are in the same folder

  


  For processing a single video I use the following command-
ffmpeg -i input.mp4 -filter:v fps=fps=15 processed/input_15fpst.mp4

  


  How do I do this for multiple videos in the folder and add a suffix _15fps to them ? I'm not very familiar with Linux programming

  


  Thank you so much !

  


  I tried doing this-
  
for f in *.MP4; do ffmpeg -i "$f" -filter:v fps=fps=15 process/"$f"; done

  


  But I want to rename the file as well, how do I change my loop ?

  


• Execute multiple commands in background from terminal & redirecting output

  9 octobre 2016, par Guernica

  I’m running ffmpeg via an exec command from php. I need to wait for the command to finish executing and run another command to call a php script.

  I need the output to be redirected to text files.

  This i have accomplished with the following code but it wont execute in the background. PHP hangs until the script has finished executing.

  exec("ffmpeg -i INPUTFILE -f mp4 -vcodec libx264 -preset fast -profile:v main -acodec aac -strict -2 OUTPUTFILE -hide_banner 1> /tmp/1.txt 2>/tmp/1.txt && php PATH_TO_PHP_SCRIPT/complete.php id=11 1> /tmp/11.txt 2> /tmp/11.txt &");

  Any help would be greatly appreciated.

  EDIT : I’ve got the required functionality by calling my original php containing the above code from another php containing

  exec("php convert.php id=".$id."  1> /tmp/".$id."_error.txt 2>/tmp/".$id."_error.txt &");

  I would rather leave this question open to find a more elegant solution or information as to why my original code at the top doesn’t function in the way i would expect.

• FFmpeg command works in terminal but gives an error in php code

  21 mai 2021, par Rider

  Use this command :

  


  ffmpeg -i lecture.mp4 -codec: copy -start_number 0 -hls_time 10 -hls_list_size 0 -f hls filename.m3u8


  


  It works.

  


  $path = '1/';
  $inputFile = 'lecture.mp4';
  $filePath = 'filename.m3u8';
  $commandOutput = exec ('/opt/ffmpeg/ffmpeg -I '.$path .$inputFile. ' -Codec: copy -start_number 0 -hls_time 10 -hls_list_size 0 -f hls'.$path .$filePath);


  


  Using this PHP code I get the error : At least one output file must be specified

  


  What is causing this error ?