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• PyQt-thread. Get dynamically output

  1er janvier 2020, par ZPro

  I use PyQt-thread for parallel conversion of mp3 files to aac via ffmpeg.
  Here is my code :

  class SubprocessThread(QThread):
  
      signal = pyqtSignal('PyQt_PyObject')
  
  
  
      def __init__(self, command, args):
  
          QThread.__init__(self)
  
          self.command = command
  
          self.args = args
  
  
  
      def __del__(self):
  
          self.wait()
  
  
  
      def run(self):
  
          output = subprocess.check_output('{0} {1}'.format(self.command, self.args), shell=True).split()
  
          self.signal.emit(output)

  And here is example of usage :

  threads = []
  
  
  
  for part in parts.keys():
  
      args = "-i \'{0}.mp3\' -c:a aac -b:a {1}k \'{2}.m4a\'".format(
  
          os.path.join(tmp_dir, str(part)),
  
          int(self.bitrate_cbx.currentText()),
  
          os.path.join(tmp_dir, str(part)))
  
      print(args)  # debug
  
      ffmpeg_thread = SubprocessThread('ffmpeg', args)
  
      ffmpeg_thread.signal.connect(self.on_data_ready)
  
      threads.append(ffmpeg_thread)
  
      ffmpeg_thread.start()
  
      self.threads_count += 1

  I want to make progress bar, based on conversion, but ffmpeg always updates last string in his output (when conversion in progress).
  Here is an example of ffmpeg output while files are converting :

  user@host$ ffmpeg -i '/home/user/001.mp3' -c:a aac -b:a 128k -vn '/home/user/test.m4a' 
  
  ffmpeg version n4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.2.0 (GCC)
  
    configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Input #0, mp3, from '/home/user/001.mp3':
  
    Metadata:
  
      encoder         : Lavf57.41.100
  
      title           : test
  
      artist          : test
  
      album_artist    : test
  
      album           : test
  
      composer        : test
  
      genre           : test
  
      date            : 2018
  
    Duration: 00:12:38.02, start: 0.025056, bitrate: 192 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 192 kb/s
  
      Metadata:
  
        encoder         : Lavc57.48
  
      Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 500x500 [SAR 1:1 DAR 1:1], 90k tbr, 90k tbn, 90k tbc (attached pic)
  
      Metadata:
  
        comment         : Cover (front)
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mp3 (mp3float) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, ipod, to '/home/user/test.m4a':
  
    Metadata:
  
      date            : test
  
      title           : test
  
      artist          : test
  
      album_artist    : test
  
      album           : test
  
      composer        : test
  
      genre           : test
  
      encoder         : Lavf58.29.100
  
      Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc58.54.100 aac
  
  size=   12107kB time=00:12:38.01 bitrate= 130.8kbits/s speed=79.2x 

  How can I receive this data (string, that begins from "size=...") from my parallel QThreads to calculate overall progress ?

• jpeglsenc : Mark codec as init-thread-safe and init-cleanup

  24 avril 2015, par Vittorio Giovara

  jpeglsenc : Mark codec as init-thread-safe and init-cleanup
  Fixes a memory leak on init failure.
  

  • [DBH] libavcodec/jpeglsenc.c

• hqx : Mark codec as init-thread-safe and init-cleanup

  7 avril 2015, par Vittorio Giovara

  hqx : Mark codec as init-thread-safe and init-cleanup
  

  • [DBH] libavcodec/hqx.c