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• Piping input AND output of ffmpeg in python

  16 mai 2017, par bluesummers

  I’m using ffmpeg to create a video, from a list of base64 encoded images that I pipe into ffmpeg.

  Outputting to a file (using the attached code below) works perfectly, but what I would like to achieve is to get the output to a Python variable instead - meaning piping input and piping output but I can’t seem to get it to work

  My current code :

  output = os.path.join(screenshots_dir, 'video1.mp4')
  
  
  
  cmd_out = ['ffmpeg',
  
             '-y',  # (optional) overwrite output file if it exists
  
             '-f', 'image2pipe',
  
             '-vcodec', 'png',
  
             '-r', str(fps),  # frames per second
  
             '-i', '-',  # The input comes from a pipe
  
             '-vcodec', 'png',
  
             '-qscale', '0',
  
             output]
  
  
  
  pipe = sp.Popen(cmd_out, stdin=sp.PIPE)
  
  
  
  for screenshot in screenshot_list:
  
      im = Image.open(BytesIO(base64.b64decode(screenshot)))
  
      im.save(pipe.stdin, 'PNG')
  
  
  
  pipe.stdin.close()
  
  pipe.wait()

  This results in a working mp4, but I would like to avoid saving to local.

  Running the same code with changing output to '-' or 'pipe:1' and adding stdout=sp.PIPE results in an error

  [NULL @ 0x2236000] Unable to find a suitable output format for ’pipe :’

• ffmpeg - Not outputting Opus audio

  3 mars 2016, par Dustin

  I’m currently writing a small script that coverts an MP4 to Opus audio on the fly and sends it to Discord in golang. Initially my script would pass an MP4 as it was downloading to ffmpeg through stdin and then pass stdout to an Opus encoder, then to Discord (exactly like this). After learning I could build ffmpeg with Opus, I’d like to cut out the opus encoder I previous had and pass ffmpeg’s output directly to Discord.

  Previous, my ffmpeg command looked like this (with using the second opus encoder)

  ffmpeg -i - -f s16le -ar 48000 -ac 2 pipe:1

  Now, without the encoder and letting ffmpeg do all the work, this is what I’ve come up with so far.

  ffmpeg -i - -f s16le -ar 48000 -ac 2 -acodec libopus -b:a 192k -vbr on -compression_level 10 pipe:1

  With this command however the audio doesn’t get accepted by Discord’s server, meaning I’m suspecting opus audio isn’t coming out the other end. No errors outputted. Have I done something wrong with ffmpeg that could of caused this ?

• Not outputting Opus raw audio

  3 mars 2016, par Dustin

  I’m currently writing a small script that coverts an MP4 to Opus audio on the fly and sends it to Discord in golang. Initially my script would pass an MP4 as it was downloading to ffmpeg through stdin and then pass stdout to an Opus encoder, then to Discord (exactly like this). After learning I could build ffmpeg with Opus, I’d like to cut out the opus encoder I previous had and pass ffmpeg’s output directly to Discord.

  Previous, my ffmpeg command looked like this (with using the second opus encoder)

  ffmpeg -i - -f s16le -ar 48000 -ac 2 pipe:1

  Now, without the encoder and letting ffmpeg do all the work, this is what I’ve come up with so far.

  ffmpeg -i - -f s16le -ar 48000 -ac 2 -acodec libopus -b:a 192k -vbr on -compression_level 10 pipe:1

  With this command however the audio doesn’t get accepted by Discord’s server, meaning I’m suspecting opus audio isn’t coming out the other end. No errors outputted. Have I done something wrong with ffmpeg that could of caused this ?