Download options _might_ work, but depends on what formats are available: --prefer-free-formats Prefer free video formats unless a specific one

Download options _might_ work, but depends on what formats are available: --prefer-free-formats Prefer free video formats unless a specific one is requested If opus is provided, you could probably download it this way, but I think your best bet is the post-processing method (which of course isn't perfect): -x, --extract-audio Convert video files to audio-only files (requires ffmpeg or avconv and ffprobe or avprobe) --audio-format FORMAT Specify audio format: "best", "aac", "flac", "mp3", "m4a", "opus", "vorbis", or "wav"; "best" by default; No effect without -x