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• Passing python's file like object to ffmpeg via subprocess

  3 juillet 2012, par tejinderss

  I have a django FileField, which i use to store wav files on the Amazon s3 server. I have set up the celery task to read that file and convert it to mp3 and store it to another FileField. Problem i am facing is that i am unable to pass the input file to ffmpeg as the file is not the physical file on the hard disk drive. To circumvent that, i used stdin to feed the input stream of the file with the django's filefield. Here is the example :

  output_file = NamedTemporaryFile(suffix='.mp3')
  
  subprocess.call(['ffmpeg', '-y', '-i', '-', output_file.name], stdin=recording_wav)

  where recording_wav file is : , which is actually stored on the amazon s3 server.
  The error for the above subprocess call is :

  AttributeError: 'cStringIO.StringO' object has no attribute 'fileno'

  How can i do this ? Thanks in advance for the help.

  Edit :

  Full traceback :

  [2012-07-03 04:09:50,336: ERROR/MainProcess] Task api.tasks.convert_audio[b7ab4192-2bff-4ea4-9421-b664c8d6ae2e] raised exception: AttributeError("'cStringIO.StringO' object has no attribute 'fileno'",)
  
  Traceback (most recent call last):
  
    File "/home/tejinder/envs/tmai/local/lib/python2.7/site-packages/celery/execute/trace.py", line 181, in trace_task
  
      R = retval = fun(*args, **kwargs)
  
    File "/home/tejinder/projects/tmai/../tmai/apps/api/tasks.py", line 56, in convert_audio
  
      subprocess.Popen(['ffmpeg', '-y', '-i', '-', output_file.name], stdin=recording_wav)
  
    File "/usr/lib/python2.7/subprocess.py", line 672, in __init__
  
      errread, errwrite) = self._get_handles(stdin, stdout, stderr)
  
    File "/usr/lib/python2.7/subprocess.py", line 1043, in _get_handles
  
      p2cread = stdin.fileno()
  
    File "/home/tejinder/envs/tmai/local/lib/python2.7/site-packages/django/core/files/utils.py", line 12, in <lambda>
  
      fileno = property(lambda self: self.file.fileno)
  
    File "/home/tejinder/envs/tmai/local/lib/python2.7/site-packages/django/core/files/utils.py", line 12, in <lambda>
  
      fileno = property(lambda self: self.file.fileno)
  
  AttributeError: &#39;cStringIO.StringO&#39; object has no attribute &#39;fileno&#39;
  
  </lambda></lambda>

• python multiprocessing and ffmpeg corrupts files

  1er juillet 2012, par misterte

  I'm currently trying to convert several videos to three different outputs, all using ffmpeg : mp4, webm and jpeg. I also need to run this script in different directories and create within the directories webm, mp4 and jpeg subdirectories where the respective converted files are stored.

  I am running the following script inside a directory with 8 .mov test files in it. Files work ok as .mov.

  (It's a bit long, so here you can view it online)

  The script creates all files and directories. I can also note that all Consumer processes take tasks and complete them. The problem is resulting .mp4 and .webm files are corrupted.

  Here you can see an example output. It's a bit long, so I think it's best if I point out the part I think is relevant.

  ...
  
  [h264 @ 0x121815a00]no frame!
  
  Error while decoding stream #0.0
  
  [h264 @ 0x121815a00]AVC: nal size -6554108
  
  [h264 @ 0x121815a00]no frame!
  
  Error while decoding stream #0.0
  
  [h264 @ 0x121815a00]AVC: nal size 391580264
  
  [h264 @ 0x121815a00]no frame!
  
  ...

  This does not happen if I run ffmpeg straight from the console.

  ffmpeg -i movie.mov -b 500k -s 640x360 -padtop 60 -padbottom 60 movie_out.webm

  I can even run it in parallel shells and the output will not be affected.

  Can anyone see what the problem is ?

  thnx !

  A.

• ffmpeg memery leak with av_read_frame

  31 mai 2016, par Link

  I use av_read_frame in two ways below :

  1.

  for(;;){
  
          if (av_read_frame(pFormatCtx, packet) >= 0){
  
              av_packet_unref(packet);
  
          }
  
      }

  2.

     for(;;){
  
          packet = av_packet_alloc();
  
          if (av_read_frame(pFormatCtx, packet) >= 0){
  
              av_packet_free(&packet);
  
          }
  
      }

  Noting to do but read file and call free methods with FFMPEG APIs.
  Both have a memery leak problem.(1.72GB film file got 300MB memory increment)
  Anyone got rosulation ?