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

  2 juillet 2013, par 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.

• Desktop streaming to Wowza server using ffmpeg

  24 avril 2013, par Gergely Lukacsy

  Recently, I'm trying to utilize ffmpeg for streaming live desktop screen to a Wowza media server.

  I have partial success on the subject so far :

  I've managed to record desktop screen using the UScreenCapture directx dshow filter, and I'm also able to send this record to the server.
  However, when I'm trying to send the screen directly to the server, it fails every time. The player is buffering pretty slowly, and shows a blank screen when it's done (the counter keeps counting).

  So, here are the working methods

  for recording screen :

  ffmpeg -f dshow -i video="UScreenCapture" -r 25 -vcodec libx264 output.flv

  and for streaming video :

  ffmpeg -re -i  -map 0 -c copy -vbsf h264_mp4toannexb -f mpegts udp://stream.server.xyz:52000?pkt_size=1024

  And this is the code I'm using :

  ffmpeg -f dshow -i video="UScreenCapture" -s width x height -r framerate -vcodec libx264 -pix_fmt yuv420p -b:v bitrate -an -vbsf h264_mp4toannexb -f mpegts udp ://your.destination.url:PORTNUMBER ?pkt_size=some_bytes

  As far as I can remember, it worked well before I upgraded wowza.

  Some additional info :

  • OS : win7 sp1 64bit
  • ffmpeg N-49610-gc2dd5a1 (Zeranoe FFmpeg build 2013 Feb 5)
  • UScreenCapture : x64 Edition Version 2.0.14
  • Wowza 3.5.2 running on a Debian linux 2.6.32-5-amd64
  • Flowplayer : 3.2.15

  Looking trough the Wowza log files, something caught my attention. It seems when I'm streaming desktop screen, the server somhow gets uncomplete packets, but when I'm streaming a video file, the error doesn't occurs.

  RTPDePacketizerMPEGTS.handleRTPPacket
  
  WARN server comment 2013-04-11 11:26:24 - - - - - 152629.665 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:27 - - - - - 152632.782 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:31 - - - - - 152636.383 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:38 - - - - - 152643.484 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:47 - - - - - 152653.088 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:52 - - - - - 152657.587 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:56 - - - - - 152661.624 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:27:05 - - - - - 152670.805 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472

  What causes this error ? Any ideas ?

  Thanks in advance !

• FFmpeg error message when processing

  19 avril 2013, par FlyingCat

  Hi I am using FFmpeg to get the image from several video files.

  I got my ffmpeg codes ready but I got the following error when I exec my codes.

  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 17:02:36 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.
  
  
  
  //files info...
  
  //files info...
  
  
  
  Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format 'yuvj420p'
  
  
  
  //file info...
  
  
  
  [buffer @ 0x1513c40] Buffering several frames is not supported. Please consume all available frames before adding a new one.
  
   Last message repeated 75 times
  
  
  
  [image2 @ 0x1513460] Could not open file : /test/project
  
  av_interleaved_write_frame(): Input/output error

  I only show the error messages that have color highlighted.

  My codes

                 $ffmpeg ="/usr/bin/ffmpeg";
  
  
  
                 $image_source_path = '/test/project/test.mp4';
  
                 $ALL_PLACE_WIDTH = 300;
  
                 $ALL_PLACE_HEIGHT = 300;
  
  
  
                 $image_cmd = " -r 1 -ss 00:00:10 -t 00:00:01 -s ".$ALL_PLACE_WIDTH."x".$ALL_PLACE_HEIGHT."   -f image2 " ;
  
  
  
                 $dest_image_path = '/test/project';
  
  
  
                 $str_command= $ffmpeg  ." -i " . $image_source_path . $image_cmd .$dest_image_path;
  
                 shell_exec($str_command);

  It seems my linux want to me switch avconv. I am not sure how to fix these errors. Can someone give me a hint about it ? Thanks so much !