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• ffmpeg not working after update to Mavericks

  26 février 2015, par Hudson Buddy

  After recently updating to Mavericks 10.9.5, my installation of ffmpeg has been bugging out

  Error:

  dyld: Library not loaded: /usr/local/lib/libx264.142.dylib
    Referenced from: /usr/local/bin/ffmpeg
    Reason: image not found
  Trace/BPT trap: 5
  

  Any thoughts? I'm not very familar with manual compiling and I installed ffmpeg through Homebrew.

  I tried uninstalling and doing:

  brew install ffmpeg --HEAD
  brew install ffmpeg --build-from-source
  

  but it spits back a ./configure error

  ==> ./configure --prefix=/usr/local/Cellar/ffmpeg/2.4.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample
  If you think configure made a mistake, make sure you are using the latest
  version from Git.  If the latest version fails, report the problem to the
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  Include the log file "config.log" produced by configure as this will help
  solve the problem.
  
  READ THIS: https://github.com/Homebrew/homebrew/wiki/troubleshooting
  
  These open issues may also help:
  gpac 0.5.0 doesn't build against ffmpeg 2.4.1 (https://github.com/Homebrew/homebrew/issues/32978)
  

• libx264 bitrate to high for streaming

  26 février 2015, par KevinA

  I'm using libx264 to encode video captured at 1080p 24fps from a video camera. The output of the encoder goes to Live555 for streaming. I cannot get the bitrate below 30 mb/s.

  My Current Settings for x264 are:

  if (x264_param_default_preset(&m_pParam, "ultrafast", "zerolatency") != 0){
      return false;
  }
  int fps = 24;
  m_pParam.i_threads = 1;
  m_pParam.i_fps_num = fps;
  m_pParam.i_fps_den = 1;
  m_pParam.i_width = m_iWidthOut;
  m_pParam.i_height = m_iHeightOut;
  
  // One keyframe per X frames:
  m_pParam.i_keyint_max = 60;
  
  //Rate control:
  m_pParam.rc.i_rc_method = X264_RC_CRF;
  m_pParam.rc.f_rf_constant = fps - 5;
  m_pParam.rc.f_rf_constant_max = fps + 5;
  //m_pParam.i_sps_id = 7;
  //For streaming:
  m_pParam.b_repeat_headers = 1;
  m_pParam.b_annexb = 1;
  m_pParam.b_intra_refresh = 1;
  
  if (x264_param_apply_profile(&m_pParam, "main") != 0) {
      return false;
  }
  
  return true;
  

  Changing the preset seems to only slow the encoding rate and consequently the frame rate.

  How can I get the bitrate below 30mb/s so I can stream to something like a phone?

• ffmpeg 10.04 Could Not Find Codec Parameters [closed]

  12 février 2015, par Dmitry

  I am getting an error while executing the command ffmpeg -i /path/to/video.mp4 :

    ffmpeg version git-2012-07-24-93342de Copyright (c) 2000-2012 the FFmpeg developers
        built on Jul 24 2012 23:55:41 with gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
        configuration: --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-swscale --enable-vdpau --enable-version3 --enable-libtheora --enable-libvorbis --enable-libvpx --enable-x11grab
        libavutil      51. 65.100 / 51. 65.100
        libavcodec     54. 44.100 / 54. 44.100
        libavformat    54. 20.100 / 54. 20.100
        libavdevice    54.  2.100 / 54.  2.100
        libavfilter     3.  3.100 /  3.  3.100
        libswscale      2.  1.100 /  2.  1.100
        libswresample   0. 15.100 /  0. 15.100
        libpostproc    52.  0.100 / 52.  0.100
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2a1b240] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), 1280x720): unspecified pixel format
      Consider increasing the value for the 'analyzeduration' and 'probesize' options
      /path/to/video.mp4: could not find codec parameters
  

• Does ffmpeg fate testing include x264 encoding test also ?

  5 février 2015, par Shivraj Patil

  Ffmpeg fate tests all the decoders(hevc, h264, etc). If I use x264 libraries so as to encode the video, does the fate tests x264 encoder also? If yes how should I check the same?

• LSB replacement (n & 1) | b causing segmentation fault : 11

  2 février 2015, par progdo

  I'm trying to to apply LSB replacement on int16_t. But it only accepts 0 bit, if I replace with 1 bit, it gives me segmentation fault. Any help? Specifically, I'm modifying x264 dct coefficients,

  h->dct.luma4x4[2][2] = ((h->dct.luma4x4[2][2]) & ~1) | 1
  

  Some how it gives me segmentation fault. It was ok with 0 bit.