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• avcodec/options_table : make AVCodecContext->profile search for child constants

  10 mai 2020, par Marton Balint

  avcodec/options_table : make AVCodecContext->profile search for child constants
  This change makes it possible for child encoders to define custom profile
  
  option names which can be used for setting the AVCodecContext->profile.
  Also rename unit name to something rather unique, so it won't be used elsewhere.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] doc/codecs.texi
  • [DH] libavcodec/options_table.h

• Search For Specific Values Result in Python

  5 mai 2020, par jamlot

  I am attempting to write a Python script that looks for black video and silent audio in a file, and returns only the time instances when they occur.

  



  I have the following code working using the ffmpeg-python wrapper, but I can't figure out an efficient way to parse the stdout or stderror to return only the instances of black_start, black_end, black_duration, silence_start, silence_end, silence_duration.

  



  Putting ffmpeg aside for those who are not experts, how can I use re.findall or similar to define the regex to return only the above values ?

  



  import ffmpeg 

input = ffmpeg.input(source)
video = input.video.filter('blackdetect', d=0, pix_th=0.00)
audio = input.audio.filter('silencedetect', d=0.1, n='-60dB')
out = ffmpeg.output(audio, video, 'out.null', format='null')
run = out.run_async(pipe_stdout=True, pipe_stderr=True)
result = run.communicate()

print(result)


  



  This results in the ffmpeg output, which contains the results I need. Here is the output (edited for brevity) :

  



  (b'', b"ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_3 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags=-fno-stack-check --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  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
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/otoolej/Documents/_lab/source/black-silence-detect/AUUV71900381_test.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 537199360
    compatible_brands: qt  
    creation_time   : 2019-11-14T04:12:49.000000Z
  Duration: 00:03:50.28, start: 0.000000, bitrate: 185168 kb/s
    Stream #0:0(eng): Video: prores (HQ) (apch / 0x68637061), yuv422p10le(tv, bt709, progressive), 1920x1080, 183596 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
    Metadata:
      creation_time   : 2019-11-14T04:12:49.000000Z
      handler_name    : Apple Video Media Handler
      encoder         : Apple ProRes 422 (HQ)
      timecode        : 00:00:00:00
    Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s (default)
    Metadata:
      creation_time   : 2019-11-14T04:12:49.000000Z
      handler_name    : Apple Sound Media Handler
      timecode        : 00:00:00:00
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
    Metadata:
      creation_time   : 2019-11-14T04:12:49.000000Z
      handler_name    : Time Code Media Handler
      timecode        : 00:00:00:00
Only '-vf blackdetect=d=0:pix_th=0.00' read, ignoring remaining -vf options: Use ',' to separate filters
Only '-af silencedetect=d=0.1:n=-60dB' read, ignoring remaining -af options: Use ',' to separate filters
Stream mapping:
  Stream #0:0 -> #0:0 (prores (native) -> wrapped_avframe (native))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
  Metadata:
    major_brand     : qt  
    minor_version   : 537199360
    compatible_brands: qt  
    encoder         : Lavf58.29.100
    Stream #0:0(eng): Video: wrapped_avframe, yuv422p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
    Metadata:
      creation_time   : 2019-11-14T04:12:49.000000Z
      handler_name    : Apple Video Media Handler
      timecode        : 00:00:00:00
      encoder         : Lavc58.54.100 wrapped_avframe
    Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s (default)
    Metadata:
      creation_time   : 2019-11-14T04:12:49.000000Z
      handler_name    : Apple Sound Media Handler
      timecode        : 00:00:00:00
      encoder         : Lavc58.54.100 pcm_s16le
[silencedetect @ 0x7fdd82d011c0] silence_start: 0
frame=  112 fps=0.0 q=-0.0 size=N/A time=00:00:05.00 bitrate=N/A speed=9.96x    
[blackdetect @ 0x7fdd82e06580] black_start:0 black_end:5 black_duration:5
[silencedetect @ 0x7fdd82d011c0] silence_end: 5.06285 | silence_duration: 5.06285
frame=  211 fps=210 q=-0.0 size=N/A time=00:00:09.00 bitrate=N/A speed=8.97x    
frame=  319 fps=212 q=-0.0 size=N/A time=00:00:13.00 bitrate=N/A speed=8.63x    
frame=  427 fps=213 q=-0.0 size=N/A time=00:00:17.08 bitrate=N/A speed=8.51x    
frame=  537 fps=214 q=-0.0 size=N/A time=00:00:22.00 bitrate=N/A speed=8.77x    
frame=  650 fps=216 q=-0.0 size=N/A time=00:00:26.00 bitrate=N/A speed=8.63x    
frame=  761 fps=217 q=-0.0 size=N/A time=00:00:31.00 bitrate=N/A speed=8.82x    
frame=  874 fps=218 q=-0.0 size=N/A time=00:00:35.00 bitrate=N/A speed=8.71x    
frame=  980 fps=217 q=-0.0 size=N/A time=00:00:39.20 bitrate=N/A speed=8.67x    
...  
frame= 5680 fps=213 q=-0.0 size=N/A time=00:03:47.20 bitrate=N/A speed=8.53x    
[silencedetect @ 0x7fdd82d011c0] silence_start: 227.733
[silencedetect @ 0x7fdd82d011c0] silence_end: 229.051 | silence_duration: 1.3184
[silencedetect @ 0x7fdd82d011c0] silence_start: 229.051
[blackdetect @ 0x7fdd82e06580] black_start:229.28 black_end:230.24 black_duration:0.96
frame= 5757 fps=214 q=-0.0 Lsize=N/A time=00:03:50.28 bitrate=N/A speed=8.54x    
video:3013kB audio:43178kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[silencedetect @ 0x7fdd82d011c0] silence_end: 230.28 | silence_duration: 1.22856
\n")


  



  What is the most efficient way to parse the output data to find/return only those result values so I can build further logic from them in my code ? In this case, I would want only the following values returned :

  



  silence_start : 0
  
silence_end : 5.06285
  
silence_duration : 5.06285

  



  black_start:0
  
black_end:5
  
black_duration:5

  



  silence_start : 227.733
  
silence_end : 229.051
  
silence_duration : 1.3184

  



  black_start:229.28
  
black_end:230.24
  
black_duration:0.96

  



  silence_start : 229.051
  
silence_end : 230.28
  
silence_duration : 1.22856

  



  I think there is a way to get only those values using ffprobe, but I couldn't get that to work within the wrapper method. Possible I would have to run ffprobe as a subprocess and parse that result somehow. That would be a total re-do though.

  


• avformat/matroskaenc : Improve mimetype search

  3 novembre 2019, par Andreas Rheinhardt

  avformat/matroskaenc : Improve mimetype search
  Use the mime_types of the corresponding AVCodecDescriptor instead of
  
  tables specific to Matroska. The former are generally more encompassing :
  
  They contain every item of the current lists except "text/plain" for
  
  AV_CODEC_ID_TEXT and "binary" for AV_CODEC_ID_BIN_DATA.
  The former has been preserved by special-casing it while the latter is
  
  a hack added in c9212abf so that the demuxer (which uses the same tables)
  
  sets the appropriate CodecID for broken files ("binary" is not a correct
  
  mime type at all) ; using it for the muxer was a mistake. The correct
  
  mime type for AV_CODEC_ID_BIN_DATA is "application/octet-stream" and
  
  this is what one gets from the AVCodecDescriptor.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c