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• avutil/internal : remove FF_ALLOCx{_ARRAY}_OR_GOTO macros

  2 juin 2020, par Limin Wang

  avutil/internal : remove FF_ALLOCx_ARRAY_OR_GOTO macros
  These functions have a terrible design, let us fix them before extending
  
  them.
  
  First design mistake : no error code. A helper function for testing
  
  memory allocation failure where AVERROR(ENOMEM) does not appear is
  
  absurd.
  Second design mistake : printing a message. Return the error code, let
  
  the caller print the error message.
  Third design mistake : hard-coded use of goto.
  http://ffmpeg.org/pipermail/ffmpeg-devel/2020-May/262544.html
  Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
  

  • [DH] libavutil/internal.h

• fftools/ffmpeg_dec : abort if avcodec_send_packet() returns EAGAIN

  22 mai 2023, par James Almer

  fftools/ffmpeg_dec : abort if avcodec_send_packet() returns EAGAIN
  As the comment in the code mentions, EAGAIN is not an expected value here
  
  because we call avcodec_receive_frame() until all frames have been returned.
  
  avcodec_send_packet() returning EAGAIN means a packet is still buffered, which
  
  hints that the underlying decoder is buggy and not fetching packets as it
  
  should.
  An example of this behavior was in the libdav1d wrapper before f209614290,
  
  where feeding it split frames (or individual OBUs) would result in the CLI
  
  eventually printing the confusing "Error submitting packet to decoder : Resource
  
  temporarily unavailable" error message, and just keep going until EOF without
  
  returning new frames.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] fftools/ffmpeg_dec.c

• subprocess.run output is empty (python 3.8)

  26 juillet 2022, par Marino Linaje

  I'm trying to capture the output of a command with the following code :

  


  lines = subprocess.run(['ffmpeg', '-hide_banner', '-nostats', '-i', in_filename, '-vn', '-af', 'silencedetect=n={}:d={}'.format(silence_threshold, silence_duration), '-f', 'null', '-'], capture_output=True, text=True, shell=True, check=True, encoding='utf-8').stdout 
print (lines)


  


  But lines is an empty string and nothing is printed.
When capture_output=True is removed, the correct output is showed (without printing it).

  


  I tested many combinations, including removing all the subprocess.run parameters and only include capture_output=True with the same result.

  


  I also tested with few argument for a minimal example : subprocess.run(['ffmpeg', '-version'], capture_output=True, text=True, shell=True, check=True, encoding='utf-8').stdout

  


  Also tested stdout=subprocess.PIPE and stderr=subprocess.PIPE as subprocess.run arguments instead of capture_output=True

  


  I can't figure out what is happening. Thanks in advance !