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• Can you split a file using ffmpeg directly from a db ?

  31 mars 2014, par Jeff

  I am splitting a file using ffmpeg and python. I am able split a file if I input a file path, but if I send in the file itself from my mongodb, it errors out. Is there a way to get ffmpeg to run using the file instead of the path to the file ?

  python code :

  args = [ffmpeg_binary,
  
                           "-v", "quiet",
  
                           "-y", "-i", video_file, "-vcodec", "copy", "-acodec", "copy",
  
                   "-ss", "00:00:00", "-t", "00:00:10", "-sn",
  
                   output_file_name ]
  
  
  
  pipe = sp.Popen(args)

  if video_file is a gridfs.grid_file.GridOut object or a (gridfs.grid_file.GridOut object).read(), I get :

  Traceback (most recent call last):
  
    File "C:/dev/youniversity/test.py", line 21, in <module>
  
      split_vid_from_file(vid_file)
  
    File "C:\dev\youniversity\src\lib\ffmpeg_lib.py", line 107, in split_vid_from_file
  
      pipe = sp.Popen(args)
  
    File "C:\Python27\lib\subprocess.py", line 709, in __init__
  
      errread, errwrite)
  
    File "C:\Python27\lib\subprocess.py", line 957, in _execute_child
  
      startupinfo)
  
  TypeError: must be string without null bytes or None, not str
  
  </module>

  How do I split the video directly from the DB ?

  EDIT : I found that you can do this :

  ... "-y", "-", ... 
  
  
  
  pipe = sp.Popen(args, stdin=sp.PIPE)

  but I don't want the user to type input, I want to pipe in the variable.

• avformat/hls : Split allowed_segment_extensions off allowed_extensions

  29 avril, par Michael Niedermayer

  avformat/hls : Split allowed_segment_extensions off allowed_extensions
  This allows the user to set only the one that is needed to ALL or a
  
  specific "wrong" extension like html
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/hls.c

• ffmpeg split video H264 stutters on Windows Media Player

  9 mars 2019, par Juan Foegen

  I am converting and splitting wmv and mp4 into new mp4 files. I am using ffmpeg to do the conversion with simply :
  ffmpeg -i inputfile.wmv -vcodec libx264 -ss 00:00:10 -t 00:00:15 outputfile.mp4

  So when I create my split video it plays fine on other video players, like VLC, but stutters when initially playing on Windows Media Player and even shows a blank screen for a moment and then after about 5 seconds, the video will play normally. If I then select play again without reloading, Windows Media Player will play the video fine, with no stuttering.

  If I REMOVE the start parameter when doing the conversion, then the resulting video will play without issues on all my players, INCLUDING Windows Media Player.

  I have tried changing the frame rate, the bit rate and altered different optimization options mentioned here - https://trac.ffmpeg.org/wiki/Encode/H.264

  I need the split video to play on Windows machines on Windows Media Player and on the web streamed using the video element. This is why I chose H264 codec and MP4.

  Has anyone had issues playing ffmpeg split videos using H264 codec with Windows Media Player ? I am using the latest version of ffmpeg. Anyone have any other suggestions on any different settings I could try to adjust ?

  Thanks