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• tools/target_dec_fuzzer : Remove mjpeg hack

  21 avril, par Andreas Rheinhardt

  tools/target_dec_fuzzer : Remove mjpeg hack
  ff_mjpeg_decoder is now referenced directly by the relevant
  
  decoders, so that the linker sees the dependency and
  
  just does the desired thing. So remove the hack.
  (Btw : The preprocessor does not do string comparisons, instead
  
  undefined tokens in #if checks evaluate to 0, making the check
  
  true regardless of the actual codec fuzzed (and leading to
  
  linker errors if the mjpeg decoder is disabled).)
  Reviewed-by : Kacper Michajlow <kasper93@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] tools/target_dec_fuzzer.c

• FFMPEG FDKAAC and Python

  3 avril 2024, par Eric Barker

  Been banging my head against the wall for days on this. I'm writing a python program to take a 48kHz WAV file, convert it to 44.1kHz and encode it to HE-AAC via FDKAAC. FDK cannot convert to sample rates, so I'm using FFMPEG as the wrapper and piping it through FDKAAC. In a perfect world, I'd make a custom build of FFMPEG with FKD, but I've run into loads of issues on our Windows Server 2019 machine trying to build out FFMPEG, so I'm using vanilla FFMPEG with FDK piped in.

  


  I can get the command to work perfectly from a command prompt :

  


  ffmpeg -progress pipe:2 -i  -f wav -ar 44100 - | fdkaac -p 5 -b 64000 -o 


  


  But when I try to split it in Python for a Popen, it tries to evaluate the arguments and fails because ffmpeg doesn't have a "-p" argument :

  


  cmd = ['ffmpeg', '-progress', 'pipe:2', '-i', inFile, \
    '-f', 'wav', '-ar', '44100', '-', '|', \
    'fdkaac', '-p', '5', '-b', '64000', '-o', outFile]
fdkProcess = subprocess.Popen(cmd,
            stdout=subprocess.PIPE,
            universal_newlines=True)
for line in fdkProcess.stdout:
    print(line)


  


  RESULT :

  


  Unrecognized option 'p'.
Error splitting the argument list: Option not found


  


  I'll admit, I don't fully understand the pipeline process, and how to split commands via the "|" flag, and have them properly feed into stdout for the subprocess function to work correctly. I'm fairly new to python, and very new to programmatically capturing the output of a process like ffmpeg.

  


• avformat/movenc : Make check actually check what is intended

  20 février 2024, par Andreas Rheinhardt

  avformat/movenc : Make check actually check what is intended
  Also fixes a Clang warning :
  
  "overlapping comparisons always evaluate to false
  
  [-Wtautological-overlap-compare]"
  Reviewed-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/movenc.c