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• ffmpeg -i an incoming file upload ? [closed]

  29 août 2020, par David542

  I'm not sure if this is more a JavaScript question or ffmpeg, but suppose I have a scenario where a user is uploading a 100GB file. And, before they upload it (or actually, as soon as we detect the first few frames or whatever), we want to make sure that it is a "valid" file — let's say for this question we want to verify that it is :

  


  

  • 29.97 fps

  


  • Video bitrate > X

  


  • Codec of com.apple.finalcutstudio.prores

  


  


  What would be the best way to do this ? I was thinking something like :

  


  

  1. A user clicks the upload button and selects their file.

  


  2. We upload the first 1MB of that file to our server — check that using ffmpeg (how to ignore errors or something with ffmpeg ?)

  


  3. If the file passes our initial checks we upload the entire video file. If not, we raise a warning to the end user and stop the upload.

  


  


  How could this process be done ? I am seeking a JavaScript snippet (JS Fiddle ?) and a backend snippet (to receive the partial input and issue the ffmpeg commands).

  


• avformat/ftp: use correct enum type

  20 août 2015, par Ganesh Ajjanagadde

  avformat/ftp: use correct enum type
  Fixes -Wenum-conversion from
  
  http://fate.ffmpeg.org/report.cgi?time=20150820031140&slot=arm64-darwin-clang-apple-5.1
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/ftp.c

• 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.