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• Can FFmpeg encode multiple files at once ?

  28 décembre 2016, par ivan

  I’m working on a shell script to encode the audio files in a given directory and output .flac files to another directory. My proof of concept loops through each file one by one and runs it through ffmpeg. I suspect there’s a way to pass the whole list of input files to ffmpeg in a single command, but haven’t been able to figure it out.

  My current version looks like this :

  #!/bin/sh
  
  
  
  encode_album() {
  
      local artist=$1; shift
  
      local album=$1; shift
  
      local in_dir="${HOME}/Music/raw-imports/${artist}/${album}"
  
      local out_dir="${HOME}/Music/library/${artist}/${album}"
  
  
  
      mkdir -p "${out_dir}"
  
  
  
      find "${in_dir}" -type f -name *.aiff | while IFS= read -r in_file; do
  
          local track_name=$(basename "${in_file}" .aiff)
  
          local out_file="${out_dir}/${track_name}.flac"
  
  
  
          encode_track "${in_file}" "${out_file}"
  
      done
  
  }
  
  
  
  encode_track() {
  
      local in_file=$1; shift
  
      local out_file=$1; shift
  
  
  
      null ffmpeg -i "${in_file}" -codec:a flac "${out_file}"
  
  }
  
  
  
  encode_album "Rolf Lislevand" "La Mascarade"

  This works, but do I need to feed these files into ffmpeg one by one, or is it capable of accepting a batch of files and processing them ?

• Can FFmpeg encode multiple files at once ?

  22 mai 2021, par ivan

  I'm working on a shell script to encode the audio files in a given directory and output .flac files to another directory. My proof of concept loops through each file one by one and runs it through ffmpeg. I suspect there's a way to pass the whole list of input files to ffmpeg in a single command, but haven't been able to figure it out.

  



  My current version looks like this :

  



  #!/bin/sh

encode_album() {
    local artist=$1; shift
    local album=$1; shift
    local in_dir="${HOME}/Music/raw-imports/${artist}/${album}"
    local out_dir="${HOME}/Music/library/${artist}/${album}"

    mkdir -p "${out_dir}"

    find "${in_dir}" -type f -name *.aiff | while IFS= read -r in_file; do
        local track_name=$(basename "${in_file}" .aiff)
        local out_file="${out_dir}/${track_name}.flac"

        encode_track "${in_file}" "${out_file}"
    done
}

encode_track() {
    local in_file=$1; shift
    local out_file=$1; shift

    null ffmpeg -i "${in_file}" -codec:a flac "${out_file}"
}

encode_album "Rolf Lislevand" "La Mascarade"


  



  This works, but do I need to feed these files into ffmpeg one by one, or is it capable of accepting a batch of files and processing them ?

  


• How to overlay a png to piped video source with audio mixed in via ffmpeg ?

  5 janvier 2018, par Christopher Stevens

  I’m successfully streaming silent video with music added from my Raspberry Pi (Raspbian) to YouTube via ffmpeg, with the help of this GitHub gist and this post :

  raspivid -o - -t 0 -vf -hf -w 1280 -h 720 -fps 25 -b 4000000 | \
  
  ffmpeg -i music.wav \
  
  -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental \
  
  -f flv rtmp://a.rtmp.youtube.com/live2/STREAMKEY

  The last step of my project to add a transparent, full width/height png overlay to the video (1280x720 size in my case). I’ve seen a few related answers such as this one and this one.

  With the added complexity of piping in a camera feed, mixing in an audio source and outputting to a video stream, I haven’t succeeded in adding the image overlay. Where/how would I add a transparent image overlay in the example above ?