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• How do I integrate the FFMPEG commands with Python Script ?

  12 janvier 2021, par Sukhada Deshpande

  I am trying to extract the frames when the scene changes in an .mp4 video.
The package that I am using is FFMPEG.
FFMPEG predominantly works on the CLI and I am trying to integrate it with Python3.x

  


  The command I am using in the CLI is :

  


  ffmpeg -i {0} -vf  "select=gt(scene\,0.5), scale=640:360" -vsync vfr frame%d.png


  


  The output comes out just fine with the CLI execution.

  


  But I want to use same command in a Python script, how do I do that and what should be the code ?

  


  Being an amateur in the field, currently grappling with this !

  


• How to concat all ffmpeg inputs without mapping them in the filter using windows batch script ?

  1er juin 2019, par fredsbend

  I’m running multiple runs of the ffmpeg concat filter on multiple files using Windows batch file script. I don’t always know how many files exactly need to be concatenated and the problem is that ffmpeg doesn’t automatically concatenate the inputs unless you map them all. For example, if I have to join eight files, I use the following filter mapping scheme :

   -filter_complex "[0][1][2][3][4][5][6][7]concat=n=8:v=1:a=0"

  If I have to join only 4 files later in the script, I have to change it to :

   -filter_complex "[0][1][2][3]concat=n=4:v=1:a=0"

  I had hoped not entering any mapping would automatically take all the inputs in order. I’m disappointed to find that it only takes the first two and ignores the rest. I tried simply :

   -filter_complex "concat"

  and it "guessed" the mapping according to warnings, but completely ignored all inputs after the second.

  There is no way to do this with ffmpeg alone, so I’m seeking a way to do this with the Windows batch script.

  ---

  An example of a complete and working command is :

  set commands=-filter_complex "[0][1][2][3][4][5][6][7]concat=n=8:v=1:a=0","crop=1064:800" /
  
  -crf 30 -an -movflags +faststart -loglevel quiet -stats
  
  
  
  ffmpeg -ss 00:00:36.737 -t 00:13:33.630 -i 1201.avi /
  
  -ss 00:00:00.000 -t 00:13:51.397 -i 1202.avi /
  
  -ss 00:00:00.033 -t 00:13:06.052 -i 1203.avi /
  
  -ss 00:00:00.000 -t 00:17:31.617 -i 1204.avi /
  
  -ss 00:17:31.551 -t 00:00:00.067 -i 1204.avi /
  
  -ss 00:00:00.000 -t 00:15:07.907 -i 1205.avi /
  
  -ss 00:15:07.840 -t 00:00:00.067 -i 1205.avi /
  
  -ss 00:00:00.000 -t 00:02:36.990 -i 1206.avi /
  
  %commands% 12-concat.mp4

  My goal here is that I can set commands (and/or other variables) once in the script, instead of having to change it each time the command has more or less inputs.

• How do I use this FFMPEG command in python script ?

  8 juillet 2020, par Reshma Walhekar

  I am trying to extract a single frame at every second from a video , Using this command on command line using ffmpeg ffmpeg -i input_file.mp4 -r 1 %04d.jpg

  


  I am able to do this task using ffmpeg on command line.

  


  But I want to use same command in python script, how do I do that and what should be the code ?
I am very new to this field.