Customizing ffmpeg and image magick parameters
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We use ffmpeg and image magick in the transcoder worker container to create web playable artifacts from the media you upload to Flow Production Tracking. Starting from version 10.1.0 of the transcoder worker, you can now override the parameters used to generate the media.
How to override parameters
First thing first, all the default commands are assign in the Dockerfile to there respective environment variables.
| Environment Variable | Default value | Description |
|---|---|---|
| TRANSCODER_TRANSCODE_CONVERT_PDF_TO_MOVIE | convert %{src_file} -background white -alpha remove -quality 100 -density 150 -resize x1080 -colorspace YUV %{temp_jpgs} | |
| TRANSCODER_TRANSCODE_FFMPEG_PDF_TO_MOVIE | ffmpeg -hide_banner -loglevel warning -i %{temp_jpgs} -pix_fmt yuv420p -r 24 -vf 'scale=trunc((a*oh)/2)*2:720' %{movie_file} | |
| TRANSCODER_TRANSCODE_CONVERT_PSD_TO_MOVIE | convert %{src_file}[0] -background white -alpha remove -quality 100 -density 150 -resize x1080 -colorspace YUV %{temp_jpgs} | |
| TRANSCODER_TRANSCODE_FFMPEG_PSD_TO_MOVIE | ffmpeg -hide_banner -loglevel warning -i %{temp_jpgs} -pix_fmt yuv420p -r 24 -vf 'scale=trunc((a*oh)/2)*2:720' %{movie_file} | |
| TRANSCODER_TRANSCODE_AUDIO_FROM_MP3 | ffmpeg -hide_banner -loglevel warning -i %{src_file} -strict -2 -vn -c:a libvorbis -ar 44100 -f %{format} %{dest_file} | |
| TRANSCODER_TRANSCODE_AUDIO_FROM_OTHER | ffmpeg -hide_banner -loglevel warning -i %{src_file} -strict -2 -vn -c:a libvorbis -ar 44100 -f %{format} %{dest_file}.mp3 && ffmpeg -hide_banner -loglevel warning -i %{dest_file}.mp3 -strict experimental -codec:a libmp3lame -f mp3 %{dest_file} && rm %{dest_file}.mp3 | Transcode the audio from another source than MP3 |
| TRANSCODER_TRANSCODE_H264_VCODEC | -vcodec libx264 -pix_fmt yuv420p -vf 'scale=trunc((a*oh)/2)*2:720' -g 30 -b:v 2000k -vprofile high -bf 0 -crf 26 | |
| TRANSCODER_TRANSCODE_H264_ACODEC | -strict experimental -acodec aac -ab 160k -ac 2 | |
| TRANSCODER_TRANSCODE_WEBM_VCODEC | -vcodec libvpx -vf 'scale=trunc((a*oh)/2)*2:720' -g 30 -b:v 2000k -speed 1 -quality realtime -cpu-used 0 -qmin 10 -qmax 42 | Here only the "vcodec" flag is overridable |
| TRANSCODER_TRANSCODE_WEBM_VCODEC | -acodec libvorbis -aq 60 -ac 2 -pix_fmt yuv420p | Here only the "acodec" flag is overridable |
If you want to override these default commands, all you have to do is redefine them in the docker-compose.yml file using the right syntax.
Example:
transcoderworker:
environment:
TRANSCODER_TRANSCODE_CONVERT_PDF_TO_MOVIE: <your_command>
TRANSCODER_TRANSCODE_H264_VCODEC: <your_command>
[...]
To apply your changes, recreate the container.
docker-compose up -d transcoderworker