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• ffmpeg generate overlay complex filter for audio with background image

  8 janvier 2016, par user1793606

  I am experimenting with ffmpeg and would like to generate overlay complex filter for audio with background image. The code normally works, except for when adding -filter_complex "[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]" -map "[v]" -map 0:a
  it crashes. I found the example code at https://trac.ffmpeg.org/wiki/Waveform Any help is appreciated.

  Command '['c:/ffmpeg/bin\\ffmpeg.exe', '-y', '-loop', '1', '-r', '1', '-i', 'temp\\bg.png', '-i', 'test.mp3', '-filter_complex', '[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]', '-map', '[v]', '-map', '0:a', '-c:v', 'libx264', '-preset', 'ultrafast', '-tune', 'stillimage', '-crf', '15', '-pix_fmt', 'yuv420p', '-strict', 'experimental', '-c:a', 'aac', '-b:a', '256k', '-shortest', '-threads', '0', 'done/test.mp4']'

  EDIT 1 :

  I tested this with the new verson : ffmpeg -y -i input.mp3 -i background.png -filter_complex "[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]" -map "[v]" -map 0:a -c:v libx264 -c:a copy output.mp4

  It generates an output file, but only the waveform, no background included. My end goal is to generate the waveform over the background.

• How to make ffmpeg respect the "start_time" variable when combining cdg and mp3 ?

  5 juillet 2020, par Steffen Poulsen

  I'm trying to combine two .cdg and .mp3 files because I want to make a single .mkv file out of them.

  



  When I do it I get a .mkv file alright, but the audio is unfortunately not synced with the video.

  



  So, I was wondering why this is ? Apparently I must be missing a parameter on my command or something.

  



  What I do is this :

  



  ffmpeg -y -i song.cdg -i song.mp3 -pix_fmt yuv420p -vcodec libx264 -acodec copy song.mkv


  



  It works fine, but in this particular case the result is out of sync by 1.2 seconds. This varies per song, from 0 to a couple of seconds.

  



  However, if I do a ffprobe on the .cdg file I notice that this number is already present, as the "start_time" variable :

  



  ffprobe -v error -show_format -show_streams song.cdg
...
start_time=1.186667
...


  



  So, if I just use this number directly as this for the -itsoffset parameter :

  



  ffmpeg -y -itsoffset 1.186667 -i song.cdg -i song.mp3 -pix_fmt yuv420p -vcodec libx264 -acodec copy song.mkv


  



  Then the video and audio is in perfect sync.

  



  So, I am wondering - what parameter do I need to add to my command to have ffmpeg respect this variable ?

  


• macOS compile FFMpeg as static standalone binary

  27 octobre 2019, par ColdSteel

  I am trying to compile ffmpeg for macOS (from macOS) as static binary for several days with no luck.
  Here is a script I am running to compile the FFmpeg binary

  cd /Users/$USER/ffmpeg/macOSBuild
  
  basePath=/macOSdependencies/DependenciesOutput
  
  
  
  export LD_LIBRARY_PATH="/Users/romanlevin/ffmpeg/macOSdependencies/DependenciesOutputbasePath/SDL2/lib/“
  
  
  
  ../configure --disable-autodetect --pkg-config-flags="--static" --extra-cflags="-I$basePath/SDL2/include/" --extra-ldflags="-L/Users/romanlevin/ffmpeg/macOSdependencies/DependenciesOutput/SDL2/lib/" --prefix=/usr/local --enable-gpl --enable-version3 --enable-sdl2 --enable-static --disable-shared
  
  
  
  make clean
  
  make -j8

  However it is always linking SDL2 as dynamic lib.

  Please note I have compiled the SDL2 by myself and put it in the directory I am trying to add to ld

  

  However I also have SDL2 installed with brew, but I don’t want to use it.
  I want Ffmpeg to pick compiled SDL2.

  It does looking for my Compiled library but only asdylib in a hardcoded path - which means I can’t get a portable binaries :(.

  Could some1 open my eyes on what am I doing wrong please ?