Thank you so much for the detailed explanation. That clarified a lot! I then searched Google for the map syntax you provided, and it turns out to be from the `--help` option of ffmpeg.
I had always believed the help information was available online. Now I know I have to read `ffmpeg --help`. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
