merges m4a with mp4 file. made for use with radeon relive recordings

combine.nu

# merges m4a with mp4 file. made for use with radeon relive recordings
def main [video_name: path] {
  let audio_name = $video_name | path parse | update extension m4a | path join
  let video_name = $video_name | path parse | update extension mp4 | path join

  let front = $video_name | path parse | update extension "" | path join
  let output = $front + " merged.mp4" | path join
  ffmpeg [-i $video_name -i $audio_name -c:v copy -filter_complex "[1:a] volume=2 [aud]; [0:a][aud] amix=inputs=2:duration=longest [audio_out]" -map 0:v -map "[audio_out]" $output]
}