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• Ffmpeg : mixed audio is played louder and louder, how to set a constant intensity ?

  29 août 2020, par JarsOfJam-Scheduler

  I have these items :

  


  

  • A video (my_video_with_music.webm)

  


  • Three sounds (tmp_music/forest_15s.wav, tmp_music/forest2_15s.wav and tmp_music/creak_15s.wav)

  


  • A background music (tmp_music/original_music.mp3)

  


  


  I mix all these files in two steps. First, I mix the video with the background music. Then, I mix this output with the sounds. A video with the music and the sounds, let name it "THE_VIDEO", is output.

  


  My problem is that "THE_VIDEO" increases in loudness along the video. At the beginning, it's not very loud. At the end of the video, it's very loud. I don't know why. I would want to have a constant loudness (not too loud, not too low).

  


  How can I do it ? Note that the original music file and sounds files don't increase in loudness : they have themselves a constant intensity. So it's actually FFMPEG that increases it when mixing them with the video.

  


  Sources

  


  Mixing the background music with the video (this command doesn't trigger the bug !) :

  


  C:/Users/x/Downloads/ffmpeg/bin/ffmpeg.exe -i my_video.webm -stream_loop -1 -i tmp_music/original_music.mp3 -c:v copy -shortest -fflags +shortest -max_interleave_delta 100M  my_video_with_music.webm


  


  Adding the sounds (this is the command that triggers the bug !) :

  


  C:/Users/x/Downloads/ffmpeg/bin/ffmpeg.exe -i my_video_with_music.webm -i tmp_music/forest_15s.wav -i tmp_music/creak_15s.wav -i tmp_music/forest2_15s.wav -filter_complex [1]adelay=7000|7000[a1];[1]adelay=37000|37000[a2];[1]adelay=88000|88000[a3];[2]adelay=118000|118000[a4];[0][a1][a2][a3][a4]amix=5 -c:v copy my_video_with_music_with_songs.webm


  


• TypeError : 'function' object is not subscriptable Python with ffmpeg

  25 novembre 2019, par S1mple

  clips = []
  
  
  
  def clipFinder(CurrentDir, fileType):
  
      clips.clear()
  
      for r,d,f in os.walk(CurrentDir):
  
          for file in f:
  
              if fileType in file:
  
                  clips.append(r+file)
  
      random.shuffle(clips)
  
  
  
  def removeVods(r):
  
      for f in clips:
  
          if 'vod' in clips:
  
              os.remove(r+f)
  
  
  
  def clipString():
  
      string = 'intermediate'
  
      clipList = []
  
      clipNum = 1
  
      for f in clips:
  
          clipList.append(string+str(clipNum)+'.ts'+'|')
  
          clipNum+=1
  
      string1 = ''.join(clipList)
  
      string2 = string1[0:len(string1)-1]
  
      return string2
  
  
  
  def concatFiles():
  
      clipFinder('***', '.mp4')
  
      removeVods('***')
  
      i = 0
  
      intermediates = []
  
      for f in clips:
  
          subprocess.call(['***', '-i', clips[i], '-c', 'copy', '-bsf:v', 'h264_mp4toannexb', '-f', 'mpegts', 'intermediate'+ str(i+1) +'.ts'])
  
          i += 1 
  
      clipsLength = len(clips)
  
      subprocess.call['***', '-i', '"concat:' + clipString() + '"', '-c', 'copy', '-bsf:a 
  
      aac_adtstoasc', 'output.mp4']

  I am trying to make a clip concatenator, but the last subprocess call won’t run and gives me the error shown in the question.

  Problematic code :

  subprocess.call(['***', '-i', '"concat:' + clipString() + '"', '-c', 'copy', '-bsf:a aac_adtstoasc', 'output.mp4'])

  all places with * were paths such as :
  /davidscomputer/bin/ffmpeg/

• ffmpeg - Live stream to web browser [on hold]

  21 octobre 2016, par Sreejith C M

  I was looking for a solution to stream my desktop live on my Windows system and found out ffmpeg is a good solution using dshow and everything is working fine and well. I’m using a C# wrapper for ffmpeg to record my desktop and I can save it in a local file.

  The problem I have is that, I have to watch the stream on my Web browser ( Chrome / Firefox ). I can’t use Media Server’s like wowza, red5 and also can’t use ffserver.

  I tried the ffmpeg wiki https://trac.ffmpeg.org/wiki and documentation but couldn’t figure out how to do this.

  Please help me to figure out this, how I can do this.