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• swscale/swscale : combine the input/output checks in sws_frame_setup()

  22 janvier, par James Almer

  swscale/swscale : combine the input/output checks in sws_frame_setup()
  Cosmetic change in preparation for the next commit.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libswscale/swscale.c

• 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 :’

• Copy chapters in MP4 input stream to output stream in ffmpeg

  18 juin 2017, par WheresWardy

  I’m using ffmpeg to copy two MP4 input streams into one output container and I’m having trouble maintaining the chapter indexes from both files into the output stream.

  I have two files, specified by streams.txt which is in the correct format, that both contain an H.264 video stream, an AC-3 audio stream and an AAC audio stream, and am concatenating the two files using the following ffmpeg command :

  ffmpeg -f concat -safe 0 -i streams.txt -map 0:0 -map 0:1 -map 0:2 -c:v copy -c:a:0 copy -c:a:1 copy output.mp4

  This correctly produces the output file that I want, with both files combined into an output file with all three streams. I am however having trouble adding the chapters from both input files into the output one. I understand that I’m supposed to use the -map_metadata option, but I’m having trouble with the format of it that doesn’t produce the following error message :

  Invalid chapter index 0 while processing metadata maps.