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• ffmpeg multiple loglevel parameters

  9 juillet 2013, par django

  From the document at here
  ffmpeg has following loglevel parameters.

  Simple usage would be
  "ffmpeg -loglevel error rest_of_ffmpeg_options"

  How can I use 3 loglevels together ?
  I tried following but in this case error works while warning and fatal are ignored.
  Inshort which ever is first after -loglevel is the only level working.

  -loglevel error warning fatal

  -loglevel [repeat+]loglevel | -v [repeat+]loglevel

      ‘quiet’
  
  
  
          Show nothing at all; be silent. 
  
      ‘panic’
  
  
  
          Only show fatal errors which could lead the process to crash, such as and assert failure. This is not currently used for anything. 
  
      ‘fatal’
  
  
  
          Only show fatal errors. These are errors after which the process absolutely cannot continue after. 
  
      ‘error’
  
  
  
          Show all errors, including ones which can be recovered from. 
  
      ‘warning’
  
  
  
          Show all warnings and errors. Any message related to possibly incorrect or unexpected events will be shown. 
  
      ‘info’
  
  
  
          Show informative messages during processing. This is in addition to warnings and errors. This is the default value. 
  
      ‘verbose’
  
  
  
          Same as info, except more verbose. 
  
      ‘debug’
  
  
  
          Show everything, including debugging information. 

• -ss in ffmpeg causes black frames

  26 avril 2016, par Demonedge

  I use ffmpeg to cut a video into clips. By this command :

  ffmpeg -ss 00:00:00 -i video.mp4 -to 00:01:00 -c copy cut.mp4

  Ffmpeg has to cut at key frames, thus when I concatenate each clip back to the entire video, there are some repeated frames at the beginning of each clip. Then I found this command :

  ffmpeg -i video.mp4 -ss 00:00:00 -to 00:01:00 -c copy cut.mp4

  By putting -i first solves the above problem, but it introduces some frozen frames when I concatenate my video clips back into the whole video. In fact, I saw it introduces some black frames at the beginning of each clip, so when I concatenate these clips back, there are frozen frames.

  So is there any way that I can cut my video into clips accurately without introducing black frames or frozen frames in ffmpeg ?

• Any way to assign terminal output to variable with python ?

  15 août 2022, par Gordon Fontenot

  I need to grab the duration of a video file via python as part of a larger script. I know I can use ffmpeg to grab the duration, but I need to be able to save that output as a variable back in python. I thought this would work, but it's giving me a value of 0 :

  



  cmd = 'ffmpeg -i %s 2>&1 | grep "Duration" | cut -d \' \' -f 4 | sed s/,//' % ("Video.mov")
duration = os.system(cmd)
print duration


  



  Am I doing the output redirect wrong ? Or is there simply no way to pipe the terminal output back into python ?