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• FFMPEG reconnect input if error

  15 septembre 2016, par Alkitab Suhano

  I’m finding a way to make ffmpeg reconnect if any error occurered. For my case I restream from hls to rtmp for example

  ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2000 -i "input" -c:v copy -c:a aac -ar 44100 -ab 128k -ac 2 -strict -2 -f flv rtmp://output

  FFMpeg always disconnected every 10 minutes. I searched on google and can’t find stable solution for this job.

  P.S. OS is linux (Centos 7 64bit)

  Thank you,
  Akitab

• Run ffmpeg without outputting configuration information ?

  28 mars 2014, par Matt Joiner

  I'm invoking ffmpeg with subprocess.Popen, and trying to capture the stderr output and write it to logging.

  args = ['ffmpeg', '-i', path]
  
  if start:
  
      args += ['-ss', start]
  
  if end:
  
      args += ['-t', end]
  
  args += [
  
      '-vcodec', 'copy',
  
      '-acodec', 'copy',
  
      '-scodec', 'copy',
  
      '-f', 'mpegts',
  
      '-y', '/dev/stdout']
  
  self.child = subprocess.Popen(
  
      args,
  
      stdin=open(os.devnull, 'rb'),
  
      stdout=subprocess.PIPE,
  
      stderr=subprocess.PIPE)

  ffmpeg generates a lot of configuration information like the following :

  FFmpeg version 0.6.2-4:0.6.2-1ubuntu1,
  Copyright (c) 2000-2010 the Libav
  developers built on Mar 22 2011
  15:55:04 with gcc 4.5.2
  configuration :
  —extra-version=4:0.6.2-1ubuntu1 —prefix=/usr —enable-avfilter —enable-avfilter-lavf —enable-vdpau —enable-bzlib —enable-libgsm —enable-libschroedinger —enable-libspeex —enable-libtheora —enable-libvorbis —enable-pthreads —enable-zlib —enable-libvpx —disable-stripping —enable-runtime-cpudetect —enable-vaapi —enable-gpl —enable-postproc —enable-swscale —enable-x11grab —enable-libdc1394 —enable-shared —disable-static WARNING : library configuration
  mismatch libavutil configuration :
  —extra-version=4:0.6.2-1ubuntu2 —prefix=/usr —enable-avfilter —enable-avfilter-lavf —enable-vdpau —enable-bzlib —enable-libdirac —enable-libgsm —enable-libopenjpeg —enable-libschroedinger —enable-libspeex —enable-libtheora —enable-libvorbis —enable-pthreads —enable-zlib —enable-libvpx —disable-stripping —enable-runtime-cpudetect —enable-vaapi —enable-libopenjpeg —enable-gpl —enable-postproc —enable-swscale —enable-x11grab —enable-libfaad —enable-libdirac —enable-libfaad —enable-libmp3lame —enable-librtmp —enable-libx264 —enable-libxvid —enable-libdc1394 —enable-shared —disable-static libavcodec configuration :
  —extra-version=4:0.6.2-1ubuntu2 —prefix=/usr —enable-avfilter —enable-avfilter-lavf —enable-vdpau —enable-bzlib —enable-libdirac —enable-libgsm —enable-libopenjpeg —enable-libschroedinger —enable-libspeex —enable-libtheora —enable-libvorbis —enable-pthreads —enable-zlib —enable-libvpx —disable-stripping —enable-runtime-cpudetect —enable-vaapi —enable-libopenjpeg —enable-gpl —enable-postproc —enable-swscale —enable-x11grab —enable-libfaad —enable-libdirac —enable-libfaad —enable-libmp3lame —enable-librtmp —enable-libx264 —enable-libxvid —enable-libdc1394 —enable-shared —disable-static libavutil 50.15. 1 / 50.15. 1
  libavcodec 52.72. 2 / 52.72. 2
  libavformat 52.64. 2 / 52.64. 2
  libavdevice 52. 2. 0 / 52. 2. 0
  libavfilter 1.19. 0 / 1.19. 0
  libswscale 0.11. 0 / 0.11. 0
  libpostproc 51. 2. 0 / 51. 2. 0

  Prior to finally outputting the stuff I'd like to log :

  Seems stream 0 codec frame rate
  differs from container frame rate :
  47.95 (66893/1395) -> 23.98 (66893/2790) At least one output file
  must be specified

  Is there an option to prevent this excessive output ? Should I be doing it differently ?

• Use opencv to encode into flv, playable by flash player

  13 février 2012, par Hemang Shah

  I've compiled ffmpeg with libx264 using configure options given at 1.

  This results in the following codecs being available in ffmpeg :

  $ ffmpeg -codecs | grep "264\|flv"
  
  ffmpeg version 0.10 Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Feb 10 2012 13:54:15 with gcc 4.6.1
  
  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab
  
  libavutil      51. 34.101 / 51. 34.101
  
  libavcodec     53. 60.100 / 53. 60.100
  
  libavformat    53. 31.100 / 53. 31.100
  
  libavdevice    53.  4.100 / 53.  4.100
  
  libavfilter     2. 60.100 /  2. 60.100
  
  libswscale      2.  1.100 /  2.  1.100
  
  libswresample   0.  6.100 /  0.  6.100
  
  libpostproc    52.  0.100 / 52.  0.100
  
  DEVSD  flv             Flash Video (FLV) / Sorenson Spark / Sorenson H.263
  
  D V D  h264            H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  D V D  h264_vdpau      H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (VDPAU acceleration)
  
  EV    libx264         libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  EV    libx264rgb      libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 RGB

  After this, I compiled opencv. Here is partial cmake result :

  --   Video I/O:
  
  --     DC1394 1.x:                 NO
  
  --     DC1394 2.x:                 NO
  
  --     FFMPEG:                     YES
  
  --       codec:                    YES
  
  --       format:                   YES
  
  --       util:                     YES
  
  --       swscale:                  YES
  
  --       gentoo-style:             YES
  
  --     GStreamer:                  YES
  
  --     UniCap:                     NO
  
  --     PvAPI:                      NO
  
  --     V4L/V4L2:                   /1
  
  --     Xine:                       NO

  Now, using opencv's VideoWriter, I tried to encode into flv with the following FOURCC codes :
  FLV1, X264

  While the FLV1 results in a video file not playable by flash player, but playabe by vlc ; X264 produces no results at all.
  Here is the console output for X264, resulting in a 0 byte file.

  Output #0, flv, to 'd.flv' :
  Stream #0.0 : Video : [0][0][0][0] / 0x0000, yuv420p, 320x240, q=2-31, 4915 kb/s, 90k tbn, 24 tbc

  Do you see anything amiss or incorrect ?
  thanks,