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• vp9 : set color range to MPEG for intraonly profile 0

  19 août 2017, par James Zern

  vp9 : set color range to MPEG for intraonly profile 0
  this is undocumented in the vp9 bitstream and decoding specification
  
  doc, but matches libvpx
  Reviewed-by : "Ronald S. Bultje" <rsbultje@gmail.com>
  
  Signed-off-by : James Zern <jzern@google.com>
  

  • [DH] libavcodec/vp9.c

• avfilter/af_headphone : increase max ir length

  25 septembre 2017, par Paul B Mahol

  avfilter/af_headphone : increase max ir length
  Signed-off-by : Paul B Mahol <onemda@gmail.com>
  

  • [DH] libavfilter/af_headphone.c

• How to duplicate an audio file or trim it to a specific length in ffmpeg ?

  21 octobre 2023, par Руслан Лысенко

  I want to combine a video file (with audio) and an audio file together to get one output file.

  


  Most importantly, I need to do the following.

  


  If the length of the video file is longer, then you need to increase the length of the audio file to this length.

  


  If the audio file is longer than the video file, then make the audio file shorter to match the length of the video.

  


  Example :

  


  Video 2 minutes 5 seconds

  


  Audio 1 minute -> duplicated to 2 minutes 5 seconds.

  


  If

  


  Video 1 minute

  


  Audio 2 minutes 5 seconds -> trimmed to 1 minute.

  


  But, I can't even increase the length of the audio file.

  


  export async function overlayAudio(id: number, music: Music) {
  console.log('start')
  const videoPath = path.join(__dirname, `../../../uploads/movie/${id}/result/movie/predfinal.mp4`);
  
  if (music === null) {
    return videoPath.match(/\\uploads(.*)/)[0];
  } else {
    const audioPath = path.join(__dirname, `../../../${music.audio}`);
    const outputVideoPath = path.join(__dirname, `../../../uploads/movie/${id}/result/movie/output.mp4`);
    const matchPath = outputVideoPath.match(/\\uploads(.*)/);
    const cmd = `ffmpeg -i ${videoPath} -i ${audioPath} -filter_complex "[0:a]volume=1[a];[1:a]volume=0.2[b];[b]apad[looped_audio];[a][looped_audio]amix=inputs=2:duration=longest" -c:v copy -c:a aac -strict experimental -shortest ${outputVideoPath}`;

    try {
      await execPromise(cmd);
      console.log('end!')
      return matchPath[0];
    } catch (error) {
      console.error('Error:', error);
      throw error;
    }
  }
}