Recherche avancée

Sur d’autres sites (12956)

• configure : When disabling a library disable all the related components

  5 octobre 2015, par Luca Barbato

  configure : When disabling a library disable all the related components
  This way is sufficient to use the component specific configure variable
  
  and not guard against the global library configure variable in code
  
  that is outside it (e.g. checkasm).
  

  • [DBH] configure

• Swift Get video stream duration

  14 mars 2019, par Jordane H

  I have a problem with a video which has an audio stream longer than the video stream according to ffmpeg command line :

  ffmpeg -i input.mp4 -vcodec copy -an -f null -   <--- video stream duration
  
  ffmpeg -i input.mp4 -acodec copy -an -f null -   <--- audio stream duration

  For example, the the first command gives a list of data including the stream duration of 3.64 and the second 3.80.

  I need to retrieve the video stream duration on Swift. I tried this :

  guard let videoAssetTrack = asset.tracks(withMediaType: AVMediaType.video).first else {
  
      return
  
  }
  
  
  
  let duration: CMTime = videoAssetTrack.timeRange.duration
  
  let durationTime = CMTimeGetSeconds(duration)

  It gives me 3.80, not the value I was expecting.

  Thank you for your attention, I hope you can help me on this case.

• 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.