Ryan on Nostr: MP4 can do multiple audio tracks afaik. MP4 can do multiple audio tracks afaik.https://superuser.com/questions/903257/mkv-to-mp4-with-2-soundtrack-audiohttps://www.reddit.com/r/ffmpeg/comments/ecb74d/remuxing_mkv_video_with_dual_audio_into_mp4/