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• How to wrap a C library parameter ?(Creating x264 .Net wrapper)

  6 décembre 2016, par Rella

  so in dll we have x264_param_t structure\object and a function for its setting up x264_param_apply_profile. in C we use such code to set it up

  x264_param_t param;
  
  x264_param_default_preset(&param, "veryfast", "zerolatency");
  
  param.i_threads = 1;
  
  param.i_width = width;
  
  param.i_height = height;
  
  param.i_fps_num = fps;
  
  param.i_fps_den = 1;
  
  // Intra refres:
  
  param.i_keyint_max = fps;
  
  param.b_intra_refresh = 1;
  
  //Rate control:
  
  param.rc.i_rc_method = X264_RC_CRF;
  
  param.rc.f_rf_constant = 25;
  
  param.rc.f_rf_constant_max = 35;
  
  //For streaming:
  
  param.b_repeat_headers = 1;
  
  param.b_annexb = 1;
  
  x264_param_apply_profile(&param, "baseline");

  I want to create wrapper for such.. thing. so I have libx264.dll and visual studio 2010 pro.

  How can I create .Net C# wrapper for it ?

  I am a beginner in P\Invoke stuff so I do not get a lot of it...

  what I want to achive is is frame by frame level of working with x264... By now I need only encoding parts... And all needed sample code for doing it in C is in How does one encode a series of images into H264 using the x264 C API ? . So I need to write a wrapper only for stuff mentioned there... So I am asking - how to create a wrapper on Parameter and on Function that sets up thap param. And I would love to see how to call that wrapper back from c#. So if you could provide any code in support I’d be glad to see it.

• How to wrap a C library parameter ?(Creating x264 .Net wrapper)

  6 décembre 2016, par Rella

  so in dll we have x264_param_t structure\object and a function for its setting up x264_param_apply_profile. in C we use such code to set it up

  x264_param_t param;
  
  x264_param_default_preset(&param, "veryfast", "zerolatency");
  
  param.i_threads = 1;
  
  param.i_width = width;
  
  param.i_height = height;
  
  param.i_fps_num = fps;
  
  param.i_fps_den = 1;
  
  // Intra refres:
  
  param.i_keyint_max = fps;
  
  param.b_intra_refresh = 1;
  
  //Rate control:
  
  param.rc.i_rc_method = X264_RC_CRF;
  
  param.rc.f_rf_constant = 25;
  
  param.rc.f_rf_constant_max = 35;
  
  //For streaming:
  
  param.b_repeat_headers = 1;
  
  param.b_annexb = 1;
  
  x264_param_apply_profile(&param, "baseline");

  I want to create wrapper for such.. thing. so I have libx264.dll and visual studio 2010 pro.

  How can I create .Net C# wrapper for it ?

  I am a beginner in P\Invoke stuff so I do not get a lot of it...

  what I want to achive is is frame by frame level of working with x264... By now I need only encoding parts... And all needed sample code for doing it in C is in How does one encode a series of images into H264 using the x264 C API ? . So I need to write a wrapper only for stuff mentioned there... So I am asking - how to create a wrapper on Parameter and on Function that sets up thap param. And I would love to see how to call that wrapper back from c#. So if you could provide any code in support I’d be glad to see it.

• ffmpeg : Time information does not match video duration

  8 novembre 2017, par Harry Developer

  I’m using tvheadend to record broadcasts to disc (running ubuntu). Later, I’m playing the files using players like MX Videoplayer or IJK player. Sometimes, the time information of the media files is weired. E.g., using

  ffprobe -i some-file.ts

  shows a lenght of 10 hours or even 20 hours, although the recording is only 2 hours long. Is this a ffmpeg bug ? What can be done to get the correct media length ?

  Here is the ffprobe output of the original file after recording it on disc :

  ffprobe version N-85175-ga434657 Copyright (c) 2007-2017 the FFmpeg developers
  
    built with gcc 4.9.2 (Raspbian 4.9.2-10)
  
    configuration:
  
    libavutil      55. 59.100 / 55. 59.100
  
    libavcodec     57. 90.100 / 57. 90.100
  
    libavformat    57. 72.100 / 57. 72.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 83.100 /  6. 83.100
  
    libswscale      4.  7.100 /  4.  7.100
  
    libswresample   2.  8.100 /  2.  8.100
  
  [mp3 @ 0x24caef0] Header missing
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 3 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 1 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 1 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 9 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 1 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 11 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 318 times
  
  [mpegts @ 0x247cd40] decoding for stream 4 failed
  
  [mpegts @ 0x247cd40] start time for stream 3 is not set in estimate_timings_from_pts
  
  [mpegts @ 0x247cd40] PES packet size mismatch
  
      Last message repeated 2 times
  
  [mpegts @ 0x247cd40] Could not find codec parameters for stream 4 (Audio: mp3, 0 channels, s16p): unspecified frame size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mpegts, from '30d0b11f21ce831b56cc306d9c4a18c0.backup':
  
    Duration: 10:03:33.54, start: 60774.296367, bitrate: 1883 kb/s
  
    Program 12101
  
      Metadata:
  
        service_name    : ?RTL Television
  
        service_provider: ?Unitymedia
  
      Stream #0:0[0x20b]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Stream #0:1[0x20c](ger): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, stereo, s16p, 192 kb/s
  
  Stream #0:2[0x20d](ger): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 384 kb/s
  
  Stream #0:3[0x60f](ger): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
  
    No Program
  
  Stream #0:4[0x210]: Audio: mp3, 0 channels, s16p

  Here is the output of ffprobe somefile -show_entries stream=index,start_time,duration -of compact -v 0 :

  program|stream|index=0|start_time=88858.718567|duration=8129.120000
  
  stream|index=1|start_time=88858.104267|duration=8129.496000
  
  stream|index=2|start_time=88858.104289|duration=8129.498833
  
  stream|index=3|start_time=60774.296367|duration=36213.542200
  
  
  
  stream|index=0|start_time=88858.718567|duration=8129.120000
  
  stream|index=1|start_time=88858.104267|duration=8129.496000
  
  stream|index=2|start_time=88858.104289|duration=8129.498833
  
  stream|index=3|start_time=60774.296367|duration=36213.542200
  
  stream|index=4|start_time=60774.296367|duration=8129.520000