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• stream video file as bytes into stdin

  21 décembre 2017, par M Leonard

  I am creating a process in which python opens a video file, and streams it into the stdin of an ffmpeg command. I think I have the right idea, but the way that the file is being opened is not working with stdin. Here is my code so far :

  def create_pipe():
  
  
  
      return Popen([    'ffmpeg',
  
                        '-loglevel', 'panic',
  
                        '-s', '1920x1080',
  
                        '-pix_fmt', 'yuvj420p',
  
                        '-y',
  
                        '-f', 'image2pipe',
  
                        '-vcodec', 'mjpeg',
  
                        '-r', self.fps,
  
                        '-i', '-',
  
                        '-r', self.fps,
  
                        '-s', '1920x1080',
  
                        '-f', 'mov',
  
                        '-vcodec', 'prores',
  
                        '-profile:v', '3',
  
                        '-aspect', '16:9', '-y',
  
                        'output_file_name' + '.mov'], stdin=PIPE)
  
  
  
  
  
  
  
  in_pipe = create_pipe()
  
  with open("~/Desktop/IMG_1973.mov", "rb") as f:
  
      in_pipe.communicate(input=f)

  This yields the error :

  TypeError: a bytes-like object is required, not '_io.BufferedReader'

  What would be the right way to open/stream a video file into this pipe ? I also needs to be a stream, rather than reading the whole thing into memory.

  PS. please ignore that I could natively open the file in ffmpeg... I am creating a wrapper, and it’s better if I can control the input.

• Splitting two channels of a WAV file into separate stereo files using ffmpeg

  20 mai 2022, par niedral

  When activating RAW audio on a GoPro camera, you will get a WAV file with 4 channels. Channels 1 and two are the left and the right channel of the audio. Actually, I have no idea what channels 3 and 4 are doing. For me they are empty.
Now I want to have the channels 1 and 2 as dedicated WAV files even turned into a stereo format.
At the moment I achieved this with a two-step process using the ffmpeg command line tool like :
Splitting the channels into separate files

  


  ffmpeg -y -i source.wav -c pcm_s32le -filter_complex 'channelsplit=channel_layout=4.0[C1][C2][C3][C4]' -map '[C1]' channel1.wav -c pcm_s32le -map '[C2]' channel2.wav -map '[C3]' channel3.wav -map '[C4]' channel4.wav

  


  and then convert the mono files into stereo

  


  ffmpeg -y -i channel1.wav -c pcm_s32le -ac 2 channel1-stereo.wav

  


  My question is now if I can do this in one step and even just ignore the two channels I don't care about ?

  


  Right now I need to create temporary files for all four channels and then do a second step to convert the two channels I'm interested in into stereo.

  


• mov : Rework the check for invalid indexes in stsc

  13 juillet 2016, par Vittorio Giovara

  mov : Rework the check for invalid indexes in stsc
  There are samples with invalid stsc that may work fine as is and
  
  do not need extradata change. So ignore any out of range index, and
  
  error out only when explode is set.
  Found-by : Matthieu Bouron <matthieu.bouron@stupeflix.com>
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DBH] libavformat/mov.c