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• qsv : Make the hevc idr_interval consistent with the h264 one

  17 octobre 2017, par Luca Barbato

  qsv : Make the hevc idr_interval consistent with the h264 one
  According to the MediaSDK documentation the idr_interval value has
  
  a different meaning depending on the codec :
      0 in H264 means make every I-frame IDR, in HEVC it means to have
  
      it only at the beginning.
      1 in H264 means every other I-frame is not-IDR, in HEVC it means
  
      that every I-frame is IDR.
  Keep the behaviour consistent between the two encoders by increasing
  
  by 1 internally the idr_interval value for HEVC.
  

  • [DBH] libavcodec/qsvenc_hevc.c

• avformat/utils : Move the reference to the packet list

  20 septembre 2019, par Andreas Rheinhardt

  avformat/utils : Move the reference to the packet list
  Up until now, ff_packet_list_put had a flaw : When it moved a packet to
  
  the list (meaning, when it ought to move the reference to the packet
  
  list instead of creating a new one via av_packet_ref), it did not reset
  
  the original packet, confusing the ownership of the data in the packet.
  
  This has been done because some callers of this function were not
  
  compatible with resetting the packet.
  This commit changes these callers and fixes this flaw. In order to
  
  indicate that the ownership of the packet has moved to the packet list,
  
  pointers to constant AVPackets are used whenever the target of the
  
  pointer might already be owned by the packet list.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/utils.c

• Piping input AND output of ffmpeg in python

  5 mars 2019, 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 :’