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• ffprobe or avprove returning plain text errors in JSON output

  10 April 2013, by Justin Jenkins

  I'm running avprobe to get stream infomation about a video in JSON ...

  avprobe -loglevel quiet -show_format -show_streams file.m4v -of json

  This is basically the exact same thing as ffprobe or ffmpeg -i (and I get the same error.)

  ffprobe -loglevel quiet -show_format -show_streams file.m4v -print_format json

  The command works most of the time ... however, on occation I'll have a video that has an odd stream in it that is "unsupported" and I'll get back something like this (abbreviated.)

  Unsupported codec with id 94213 for input stream 2
  
  {  "format" : {
  
      "filename" : "file.m4v",
  
      "nb_streams" : 3,
  
      "format_name" : "mov,mp4,m4a,3gp,3g2,mj2" ...

  When I run the command I get back JSON + an error in plain text, which makes the result invalid JSON and I have to "clean it up" later.

  I'm suppressing errors from the output -loglevel quiet but the error still show up.

  How can I tell avprobe/ffprobe to not show this error and hence get back a proper JSON object?

  ---

  Longer Output Examples

  ffprobe, from source, MacOS

  ffprobe version 0.9.1-subsplash, Copyright (c) 2007-2012 the FFmpeg developers
  
    built on Feb  5 2012 01:35:36 with gcc 4.2.1 (Apple Inc. build 5664)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --as=yasm --extra-version=subsplash --disable-shared --enable-static --disable-ffplay --disable-ffserver --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libfaac --enable-libvorbis --enable-libtheora --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --arch=x86_64 --enable-runtime-cpudetect --enable-nonfree
  
    libavutil    51. 32. 0 / 51. 32. 0
  
    libavcodec   53. 42. 4 / 53. 42. 4
  
    libavformat  53. 24. 2 / 53. 24. 2
  
    libavdevice  53.  4. 0 / 53.  4. 0
  
    libavfilter   2. 53. 0 /  2. 53. 0
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.m4v':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2012-01-01 06:38:43
  
      encoder         : HandBrake 0.9.5 2011010300
  
    Duration: 00:30:47.53, start: 0.000000, bitrate: 1558 kb/s
  
      Chapter #0.0: start -0.066733, end 17.784433
  
      Metadata:
  
        title           : Chapter  1
  
  
  
  ...
  
  
  
      Stream #0:2(und): Subtitle: mov_text (text / 0x74786574)
  
      Metadata:
  
        creation_time   : 2012-01-01 06:38:43
  
        handler_name    : 
  
  Unsupported codec with id 94213 for input stream 2
  
  {
  
  
  
  ...

  avprobe, from source, Ubuntu Linux

  avprobe version 10_alpha1-6:10~~git20130307.4be368b-1~quantal1, Copyright (c) 2007-2013 the Libav developers
  
    built on Mar  7 2013 22:12:44 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.m4v':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2012-01-01 06:38:43
  
      encoder         : HandBrake 0.9.5 2011010300
  
    Duration: 00:30:47.53, start: 0.000000, bitrate: 1558 kb/s
  
      Chapter #0.0: start -0.066733, end 17.784433
  
      Metadata:
  
        title           : Chapter  1
  
  
  
  ...
  
  
  
      Stream #0.2(und): Subtitle: text / 0x74786574
  
      Metadata:
  
        creation_time   : 2012-01-01 06:38:43
  
  Unsupported codec with id 94213 for input stream 2
  
  {
  
  
  
  ...

• Damaged h264 stream not working with ffmpeg but working with vlc or mplayer

  15 April 2013, by gregoiregentil

  I have a h264 file, coming from an rtsp stream, that is slightly damaged. Some frames are altered.

  ffmpeg reports:

  ffmpeg -i stream.mpg 
  
  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Apr  2 2013 17:00:59 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 90000.00 (180000/2)
  
  Input #0, mpegts, from 'a.mpg':
  
    Duration: 00:03:18.84, start: 93370.745522, bitrate: 2121 kb/s
  
    Program 1 
  
      Stream #0.0[0x44](): Video: h264 (Baseline), yuv420p, 640x480, 90k tbr, 90k tbn, 180k tbc
  
  At least one output file must be specified

  I can play the file with VLC or mplayer. Obviously, the damaged frames are "kind of blurred" but it's working. mplayer reports:

  mplayer stream.mpg
  
  MPlayer2 UNKNOWN (C) 2000-2011 MPlayer Team
  
  mplayer: could not connect to socket
  
  mplayer: No such file or directory
  
  Failed to open LIRC support. You will not be able to use your remote control.
  
  
  
  Playing stream.mpg.
  
  Detected file format: MPEG-2 transport stream format (libavformat)
  
  [lavf] stream 0: video (h264), -vid 0
  
  LAVF: Program 1 
  
  VIDEO:  [H264]  640x480  0bpp  90000.000 fps    0.0 kbps ( 0.0 kbyte/s)
  
  Load subtitles in .
  
  [ass] auto-open
  
  ==========================================================================
  
  Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
  
  Asking decoder to use 2 threads if supported.
  
  Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
  
  ==========================================================================
  
  Audio: no sound
  
  Starting playback...
  
  V:   0.0   0/  0 ??% ??% ??,?% 0 0 
  
  Movie-Aspect is undefined - no prescaling applied.
  
  VO: [xv] 640x480 => 640x480 Planar YV12 
  
  V:93370.7   0/  0 ??% ??% ??,?% 0 0 
  
  No pts value from demuxer to use for frame!
  
  Video pts after filters MISSING
  
  V:93370.7   0/  0 ??% ??% ??,?% 0 0 
  
  No pts value from demuxer to use for frame!
  
  Video pts after filters MISSING
  
  V:93370.7   0/  0 ??% ??% ??,?% 0 0 
  
  No pts value from demuxer to use for frame!
  
  Video pts after filters MISSING
  
  V:93370.7   0/  0 ??% ??% ??,?% 0 0 
  
  No pts value from demuxer to use for frame!
  
  Video pts after filters MISSING
  
  V:93370.7   0/  0 ??% ??% ??,?% 0 0 
  
  No pts value from demuxer to use for frame!
  
  Video pts after filters MISSING
  
  V:93370.7   0/  0 ??% ??% ??,?% 0 0 
  
  No pts value from demuxer to use for frame!
  
  Video pts after filters MISSING
  
  V:93370.7   0/  0 ??% ??% ??,?% 0 0 
  
  No pts value from demuxer to use for frame!

  When I try to re-encode the file with:

  ffmpeg -i stream.mpg -fflags +genpts -an -vcodec mpeg4 -r 65535/2733 stream.mp4

  ffmpeg seems to jump over the altered frames. The length of stream.mp4 << length of stream.mpg

  How could I fix this problem, i.e. having ffmpeg to output something similar to what mplayer and vlc output?

• ffmpeg run from shell runs properly, but does not when called from within .NET

  2 July 2013, by Bevin

  I'm attempting to use ffmpeg (compiled on Windows with Cygwin) in a C# program, by using the Process class to spawn an ffmpeg instance. However, I've hit a rather odd bug that doesn't make much sense.

  When I run ffmpeg directly from a shell (be it Cygwin's bash, PowerShell, cmd), ffmpeg can properly decode and reencode files without any issues:

  PS C:\audio> ffmpeg -i .\sound1.wav -acodec libvorbis -f ogg abc.ogg
  
  ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Apr  8 2013 15:10:40 with gcc 4.5.3 (GCC)
  
    configuration: --disable-encoder=vorbis --enable-libvorbis
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
  [wav @ 0x800538a0] max_analyze_duration 5000000 reached at 5015510 microseconds
  
  Guessed Channel Layout for  Input Stream #0.0 : stereo
  
  Input #0, wav, from '.\sound1.wav':
  
    Metadata:
  
      encoder         : Lavf54.63.104
  
    Duration: 00:00:05.76, bitrate: 1411 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  Output #0, ogg, to 'abc.ogg':
  
    Metadata:
  
      encoder         : Lavf54.63.104
  
      Stream #0:0: Audio: vorbis, 44100 Hz, stereo, fltp
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s16le -> libvorbis)
  
  Press [q] to stop, [?] for help
  
  size=      55kB time=00:00:05.74 bitrate=  78.5kbits/s
  
  video:0kB audio:51kB subtitle:0 global headers:4kB muxing overhead 0.817473%

  The file plays fine, and I can encode to WAV or any other format I like. However, when I call ffmpeg from C# with the following code:

  string tempfile = Path.GetTempFileName();
  
  FileStream tempfilestr = File.OpenWrite(tempfile);
  
  input.CopyTo(tempfilestr);
  
  
  
  ProcessStartInfo pstart = new ProcessStartInfo("ffmpeg", string.Format("-i \"{0}\" -v verbose -y -f wav -", tempfile));
  
  pstart.CreateNoWindow = true;
  
  pstart.ErrorDialog = false;
  
  pstart.RedirectStandardOutput = true;
  
  pstart.RedirectStandardError = true;
  
  pstart.UseShellExecute = false;
  
  
  
  
  
  Process proc = new Process();
  
  proc.StartInfo = pstart;
  
  proc.Start();
  
  StreamReader stdout = proc.StandardOutput;
  
  StreamReader stderr = proc.StandardError;
  
  
  
  outtempfilestr = File.OpenRead(outtempfile);
  
  MemoryStream output = new MemoryStream();
  
  
  
  stdout.BaseStream.CopyTo(output);
  
  
  
  try {
  
      proc.Kill();
  
  }
  
  catch(InvalidOperationException) { }
  
  catch(Win32Exception) { }
  
  
  
  File.Delete(tempfile);
  
  
  
  return output.ToArray();

  This randomly produces errors in the output:

  ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Apr  8 2013 15:10:40 with gcc 4.5.3 (GCC)
  
    configuration: --disable-encoder=vorbis --enable-libvorbis
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
  [wav @ 0x80053860] parser not found for codec pcm_s16le, packets or times may be invalid.
  
      Last message repeated 1 times
  
  [wav @ 0x80053860] max_analyze_duration 5000000 reached at 5015510 microseconds
  
  Guessed Channel Layout for  Input Stream #0.0 : stereo
  
  Input #0, wav, from 'C:\Users\Bevin\AppData\Local\Temp\tmp1CCE.tmp':
  
    Duration: 00:00:05.20, bitrate: 1411 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  [graph 0 input from stream 0:0 @ 0x8011f320] tb:1/44100 samplefmt:s16 samplerate:44100 chlayout:0x3
  
  Output #0, wav, to 'pipe:':
  
    Metadata:
  
      ISFT            : Lavf54.63.104
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s16le -> pcm_s16le)
  
  Press [q] to stop, [?] for help
  
  Multiple frames in a packet from stream 0
  
  [pcm_s16le @ 0x8005c160] Invalid PCM packet, data has size 3 but at least a size of 4 was expected
  
  Error while decoding stream #0:0: Invalid data found when processing input
  
  No more output streams to write to, finishing.
  
  size=     896kB time=00:00:05.20 bitrate=1411.3kbits/s    
  
  video:0kB audio:896kB subtitle:0 global headers:0kB muxing overhead 0.008719%

  Note that these errors don't always occur. Sometimes they happen for certain files, sometimes they don't. I've tried various combinations of stream redirects and temp files, none of them work. I've also verified the integrity of the temp files, and it all checks out. I've even extracted the temp file before it was deleted, and decoded it in shell without a hitch.

  Any ideas?

  Edit: I've tried running ffmpeg from a shell script that's run through C#. It gives the same issues. Compiling ffmpeg via MinGW gives the same issue as well.