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• Hardware acceleration RPI4 FFmpeg

  10 avril 2020, par Roman Honcharenko

  I'm trying to get to work hardware acceleration on my Raspberry pi 4-64. I'm using FFmpeg and AFAIK hwaccel can be reached by using OpenMAX or V4L2-M2M.
After '—enable-omx' and 'enable-omx-rpi' for FFmpeg, build fails with error : 'OMX_Core.h not found'. If I will provide manually omx headers, then it will compile but FFmpeg encoding will fail due to missing libraries : bcm_host.so and libopenmaxil.so

  



  I have tried reverting to userland by DISABLE_VC4GRAPHICS = "1", it produced bcm_host.so, but not libopenmaxil.so. I have tried different combinations of virtual providers and graphics settings but without success.
Is it possible to access omx hardware acceleration on RPI4-64 ?

  



  Steps to reproduce the issue :

  



  1.Download latest Poky distro, meta-openembedded, meta-raspberrypi

  



  2.Enable omx, omx-rpi support for FFmpeg

  



  3.Link headers for FFmpeg

  



  4.Build and try to use h264_omx

  



  How do I get missing library libopenmaxil.so and everything I need for hwaccel ?

  



  poky master : commit 5d47cdf448b6cff5bb7cc5b0ba0426b8235ec478

  



  meta-openembedded master : commit daa50331352c1f75da3a8ef6458ae3ddf94ef863

  



  meta-raspberrypi master : commit 8d163dd

  



  BTW, by using V4L2-M2M, I'm getting green shadows on the resulting video. Maybe can someone point me in the right direction ?

  


• Unable to install ffmpeg on CircleCi Ubuntu 14.04

  28 juillet 2017, par Mateusz Urbański

  I have Ruby on Rails project which uses CircleCI for continuous deployment. I’m trying to install ffmpeg because I need this to make all of my specs green. Unfortunately I’m not able to do that. I’ve read a lot of different topics but I didn’t find any solution for that. Currently I’m installing ffmpeg in the following way :

  cd ~/ffmpeg_sources
  
  wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
  
  tar xjvf ffmpeg-snapshot.tar.bz2
  
  cd ffmpeg
  
  PATH="$PATH:$HOME/bin" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
  
    --prefix="$HOME/ffmpeg_build" \
  
    --extra-cflags="-I$HOME/ffmpeg_build/include" \
  
    --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
  
    --bindir="$HOME/bin" \
  
    --extra-libs="-ldl" \
  
    --enable-gpl \
  
    --enable-libass \
  
    --enable-libfdk-aac \
  
    --enable-libfreetype \
  
    --enable-libmp3lame \
  
    --enable-libopus \
  
    --enable-libtheora \
  
    --enable-libvorbis \
  
    --enable-libvpx \
  
    --enable-libx264 \
  
    --enable-nonfree \
  
    --enable-x11grab
  
  PATH="$PATH:$HOME/bin" make
  
  sudo make install
  
  sudo make distclean
  
  hash -r

  I didn’t see any errors in the console but when I run my specs some of them failing because of missing ffmpeg library. How can I solve this problem ?

• ffmpeg video created from images looks faded [closed]

  17 avril 2024, par Oscar Franco

  I'm creating a video from a series of png images I have generated. However, on the final video the colors look faded. Is there anyway to preserve the look of the images ?

  


  Here is a sample image, it might be a little hard to tell due to compression but the hue of the green changes.

  


  

  


  

  


  Here are some of the commands I've used trying to get the colors to match :

  


  ffmpeg -framerate 60 -pattern_type glob -i 'capture/*.png' -c:v libx264 -preset slower -pix_fmt yuv420p -color_range tv -colorspace bt709 -color_primaries bt709 -color_trc iec61966-2-1 out.mp4


  


  ffmpeg -framerate 60 -pattern_type glob -i 'capture/*.png' -c:v h264 -x264opts colormatrix=bt709 out.mp4