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• Realtime output from ffmpeg and livestreamer using subprocess.Popen

  6 mars 2016, par Roger B

  In ffmpeg and livestreamer i only get a few lines in realtime then i get the rest of them when the process is done...

  I have tried two codes :

  from subprocess import *
  
  p = Popen('ffmpeg -i infile.mp4 outfile.mp4', stderr=STDOUT, stdout=PIPE)
  
  for line in iter(p.stdout.readline(), b'')
  
     print line.rstrip()

  and

  from subprocess import *
  
  p = Popen('ffmpeg -i infile.mp4 outfile.mp4', stderr=STDOUT, stdout=PIPE)
  
  while p.poll is None:
  
     line = p.stdout.readline()
  
     print line.rstrip()

  Both of them prints first :

  ffmpeg version N-72805-g913685f Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
  enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
  ibilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopenc
  
  ore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --ena
  
  ble-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable
  
  -libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enabl
  
  e-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable
  
  -libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --e
  
  nable-lzma --enable-decklink --enable-zlib
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.10.100
  
    Duration: 01:34:36.14, start: 0.021333, bitrate: 6205 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720,
  
   5938 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, flt
  
  p, 256 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [mp4 @ 05013ce0] Codec for stream 0 does not use global headers but container fo
  
  rmat requires global headers
  
  [mp4 @ 05013ce0] Codec for stream 1 does not use global headers but container fo
  
  rmat requires global headers
  
  Output #0, mp4, to 'b.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.36.100
  
      Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720, q
  
  =2-31, 5938 kb/s, 30 fps, 30 tbr, 15360 tbn, 15360 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 256
  
   kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help

  Then when the convert process is done the rest of the log turns up...

  How can i get all stdout in realtime ??

  EDIT :

  If i use a text file to write to it get all in realtime.

  from subprocess import *
  
  out_file = open('stdout.txt','a')
  
  Popen('ffmpeg -i infile.mp4 outfile.mp4', stderr=STDOUT, stdout=out_file)

  But i want it print out stdout in realtime..

  Why does it work in realtime to a file but not direct print ?

• ffmpeg throws conversion error, but only if the triggering web request is made from safari ?

  22 novembre 2022, par Kyoshiro Kokujou Obscuritas

  I'm using ffmpeg to do an on-the-fly conversion of audio files to ensure high compatibility. i'm converting them to OGG. and all of this is done by a .NET 6 REST service.
This service is then accessed by a javascript Frontend.
Now the problem. The exact same request runs through without any problems on Windows + Firefox, but it does not on Safari. In Safari it says something about "unknownConversion failed"

  


  it's the same file, it's the same name, and to make sure there are no weird invisible characters i used the Microsoft File API to convert it to a proper file path.

  


  code looks like this

  


  var ffmpeg = new Process();
        var startInfo = new ProcessStartInfo("D:\\Programme\\ffmpeg\\bin\\ffmpeg.exe",
            $"-i \"{path.FullName}\" -c:a libopus -f ogg -")
        {
            RedirectStandardError = true,
            RedirectStandardOutput = true,
            RedirectStandardInput = true,
            UseShellExecute = false,
            CreateNoWindow = true
        };
        ffmpeg.EnableRaisingEvents = true;
        ffmpeg.StartInfo = startInfo;
        ffmpeg.ErrorDataReceived += OnErrorDataReceived;
        ffmpeg.Exited += OnFinished;

        ffmpeg.Start();
        ffmpeg.BeginErrorReadLine();

        return File(new BufferedStream(ffmpeg.StandardOutput.BaseStream), "audio/ogg");


  


  Complete Logs : https://pastebin.com/tTUcsjuT

  


• mpegts : Update the PSI/SI table only if the version change

  28 avril 2015, par John Högberg

  mpegts : Update the PSI/SI table only if the version change
  If a PAT is finished while a PMT section filter is opened but
  
  not yet finished, the PMT section filter is closed and all
  
  the received data is discarded.
  This is usually not an issue but some multiplexers (With very
  
  quick PAT/PMT repetition settings) consistently emit a PMT
  
  section start, then a PAT, and then the rest of the PMT,
  
  causing the aforementioned behavior to result in no PMT being
  
  finished.
  In the most pathologic situation the stream information are lost
  
  and the probe fallback miscategorizes subtitles as mp3 audio.
  Avoid the issue through eliminating redundant PSI/SI table
  
  updates by checking their version field, which is required by
  
  the standard to be incremented on every change no matter how
  
  minor.
  CC : libav-stable@libav.org
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DH] libavformat/mpegts.c