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• ffmpeg decode h264 to bgra raw video for fbdev

  19 juillet 2018, par bkvaluemeal

  I’m trying to stream video between two Raspberry Pis. I have video encoding working just fine, but the decoding is proving to be a challenge. No matter what I do it seems that the video is always in the yuv420p color space and thus incompatible with fbdev. My end goal is to display the raw video on /dev/fb0 without any X server running. Could someone point me in the right direction ?

  This is the command I’m using to encode.

  ffmpeg -s 1280x720 -c:v h264_mmal -i /dev/video0 -b:v 1M -f mpegts udp:<ip>:<port>
  
  </port></ip>

• Can't install FFMPEG on OS X Mavericks

  15 novembre 2013, par CristianOrellanaBak

  I have an error when install FFMPEG through homebrew on OS X Mavericks running this command brew install ffmpeg :

  Error: ffmpeg dependency x264 was built with the following
  
  C++ standard library: libstdc++ (from clang)
  
  
  
  This is incompatible with the standard library being used
  
  to build ffmpeg: libc++ (from clang)
  
  
  
  Please reinstall x264 using a compatible compiler.
  
  hint: Check https://github.com/mxcl/homebrew/wiki/C++-Standard-Libraries

  The complete history is : I has installed FFMPEG on Mountain Lion (that worked fine), but when upgrade it to Mavericks, FFMPEG fails to create an video in my Ruby on Rails app : Ruby on Rails : FFMPEG fails after upgrade Mountain Lion to Mavericks

  Some idea or recommendation ??

  Thank you very much !

• Ruby on Rails : FFMPEG fails after upgrade Mountain Lion to Mavericks

  25 octobre 2013, par CristianOrellanaBak

  yesterday I upgrade my OS fom Mountain Lion to Mavericks and all goes well until recently.

  We are developing a Ruby on Rails v3.2.13 application for manage videos (only MP4), which worked fine until yesterday with Mountain Lion. Today (with Mavericks) I try to upload a video but get the following error in the console :

  Running transcoding...
  
  ffmpeg -y -i /Users/ME/Documents/workspace/rails/rails3-devise/public/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.mp4 -ss 0 -s 180x110 -vframes 1 -f image2 -aspect 1.6363636363636365 /Users/Me/Documents/workspace/rails/rails3-devise/public/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.png
  
  
  
  Transcoding of /Users/Me/Documents/workspace/rails/rails3-devise/public/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.mp4 to /Users/Me/Documents/workspace/railspublic/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.png succeeded
  
  
  
  Running transcoding...
  
  ffmpeg -y -i /Users/Me/Documents/workspace/rails/public/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.mp4 -ss 0 -s 180x110 -vframes 1 -f image2 -aspect 1.6363636363636365 /Users/Me/Documents/workspace/rails/rails3-devise/public/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.png
  
  
  
  Failed encoding...
  
  ffmpeg -y -i /Users/Me/Documents/workspace/rails/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.mp4 -ss 0 -s 180x110 -vframes 1 -f image2 -aspect 1.6363636363636365 /Users/Me/Documents/workspace/rails/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.png
  
  
  
  ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Sep 28 2013 20:09:07 with Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc --enable-libass --enable-ffplay --enable-libspeex --enable-libschroedinger --enable-libfdk-aac --enable-libopus --enable-frei0r --enable-libopenjpeg --extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.1/include/openjpeg-1.5 '
  
    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
  
    libpostproc    52.  2.100 / 52.  2.100
  
  [mp3 @ 0x7fd493820c00] Format mp3 detected only with low score of 1, misdetection possible!
  
  [mp3 @ 0x7fd49380a000] Header missing
  
      Last message repeated 1 times
  
  [mp3 @ 0x7fd493820c00] decoding for stream 0 failed
  
  [mp3 @ 0x7fd493820c00] Could not find codec parameters for stream 0 (Audio: mp2, 0 channels, s16p): unspecified frame size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [mp3 @ 0x7fd493820c00] Estimating duration from bitrate, this may be inaccurate
  
  /Users/Me/Documents/workspace/rails/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.mp4: could not find codec parameters
  
  
  
  Errors: no output file created.

  I reinstall the dependencies of ffmpeg, but the problem persists.

  Any ideas or suggestions to solve the problem ?
  Thank you very much !

  EDIT NOTE : I notice this when run brew upgrade :

  ==> Upgrading ffmpeg
  
  ==> Installing ffmpeg dependency: libass
  
  Error: libass dependency fontconfig was built with the following
  
  C++ standard library: libstdc++ (from clang)
  
  
  
  This is incompatible with the standard library being used
  
  to build libass: libc++ (from clang)
  
  
  
  Please reinstall fontconfig using a compatible compiler.
  
  hint: Check https://github.com/mxcl/homebrew/wiki/C++-Standard-Libraries