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• Merge video and audio with ffmpeg. Loop the video while audio is not over

  3 novembre 2016, par fstephany

  I’m trying to merge an audio file with a video file.
  I have two options :

  • Have a very small video file (e.g., 10 seconds) that loop while the audio file is not over.

  • Have a very long video file (longer than any of my audio file) on which I can attach the audio file. I would like to cut the video when the audio is finished.

  I’ve using the latter with the -t option of ffmpeg. It means I have to get the duration of the audio file to feed it into ffmpeg. Is it possible to avoid this step ?

  Any pointer for the first solution ?

• Playing RTSP stream in Android

  9 décembre 2014, par Kamil

  I’m trying to play video stream on Android device. Unfortunatelly I still get the same problem with MediaPlayer/VideoView. I’m searching for a few days, but still haven’t found any working solution.
  For test purposes I’m using MediaPlayer app from API Demos (API Demos/Media/MediaPlayer/Play Streaming Video).
  Here is code snippet for playing stream

  mMediaPlayer = new MediaPlayer();
  
  mMediaPlayer.setDataSource(path);
  
  mMediaPlayer.setDisplay(holder);
  
  mMediaPlayer.prepare();
  
  mMediaPlayer.setOnBufferingUpdateListener(this);
  
  mMediaPlayer.setOnCompletionListener(this);
  
  mMediaPlayer.setOnPreparedListener(this);
  
  mMediaPlayer.setOnVideoSizeChangedListener(this);

  When I try to play stream I get this info from logcat
  http://pastebin.com/5Uib5CH5

  This is configuration of ffserver streaming the video

  Port 8090
  
  BindAddress 0.0.0.0
  
  
  
  RTSPPort 7654
  
  RTSPBindAddress 0.0.0.0
  
  
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 10000
  
  
  
  CustomLog -
  
  NoDaemon
  
  <Feed feed1.ffm>
  
  
  
  File /tmp/feed1.ffm
  
  FileMaxSize 5M
  
  
  
  Launch ffmpeg -i mmsh://tempserv.cam/vid1
  
  
  
  ACL allow 127.0.0.1
  
  
  
  </Feed>
  
  
  
  <Stream rat1.mpg>
  
  Feed feed1.ffm
  
  Format rtp
  
  NoAudio
  
  VideoBitRate 56k
  
  VideoBufferSize 40
  
  VideoFrameRate 12
  
  VideoSize 176x144
  
  VideoGopSize 12
  
  VideoCodec libx264
  
  AVPresetVideo baseline
  
  </Stream>

  If anyone can advise me how to fix it, or at least indicate an mistake, I will be grateful.

• Getting realtime output from ffmpeg to be used in progress bar (PyQt4, stdout)

  8 mars 2017, par Jason O'Neil

  I’ve looked at a number of questions but still can’t quite figure this out. I’m using PyQt, and am hoping to run ffmpeg -i file.mp4 file.avi and get the output as it streams so I can create a progress bar.

  I’ve looked at these questions :
  Can ffmpeg show a progress bar ?
  http://stackoverflow.com/questions/1606795/catching-stdout-in-realtime-from-subprocess

  I’m able to see the output of a rsync command, using this code :

  import subprocess, time, os, sys
  
  
  
  cmd = "rsync -vaz -P source/ dest/"
  
  p, line = True, 'start'
  
  
  
  
  
  p = subprocess.Popen(cmd,
  
                       shell=True,
  
                       bufsize=64,
  
                       stdin=subprocess.PIPE,
  
                       stderr=subprocess.PIPE,
  
                       stdout=subprocess.PIPE)
  
  
  
  for line in p.stdout:
  
      print("OUTPUT>>> " + str(line.rstrip()))
  
      p.stdout.flush()

  But when I change the command to ffmpeg -i file.mp4 file.avi I receive no output. I’m guessing this has something to do with stdout / output buffering, but I’m stuck as to how to read the line that looks like

  frame=   51 fps= 27 q=31.0 Lsize=     769kB time=2.04 bitrate=3092.8kbits/s

  Which I could use to figure out progress.

  Can someone show me an example of how to get this info from ffmpeg into python, with or without the use of PyQt (if possible)

  ---

  EDIT :
  I ended up going with jlp’s solution, my code looked like this :

  #!/usr/bin/python
  
  import pexpect
  
  
  
  cmd = 'ffmpeg -i file.MTS file.avi'
  
  thread = pexpect.spawn(cmd)
  
  print "started %s" % cmd
  
  cpl = thread.compile_pattern_list([
  
      pexpect.EOF,
  
      "frame= *\d+",
  
      '(.+)'
  
  ])
  
  while True:
  
      i = thread.expect_list(cpl, timeout=None)
  
      if i == 0: # EOF
  
          print "the sub process exited"
  
          break
  
      elif i == 1:
  
          frame_number = thread.match.group(0)
  
          print frame_number
  
          thread.close
  
      elif i == 2:
  
          #unknown_line = thread.match.group(0)
  
          #print unknown_line
  
          pass

  Which gives this output :

  started ffmpeg -i file.MTS file.avi
  
  frame=   13
  
  frame=   31
  
  frame=   48
  
  frame=   64
  
  frame=   80
  
  frame=   97
  
  frame=  115
  
  frame=  133
  
  frame=  152
  
  frame=  170
  
  frame=  188
  
  frame=  205
  
  frame=  220
  
  frame=  226
  
  the sub process exited

  Perfect !