So I have MKV/MP4 with multiple audio tracks and multiple subtitle tracks.
I want to remux the video so only 1 audio and subtitle is present. On OS X, I currently use a tool called MP4Tools/MKVTools.
It lets me select/tick which tracks I want in the output file. (apologies since I cannot find a video on my Mac that has multiple audio/subtitles).
As can be seen from the screen (one with red line), subtitles are process in 2 ways. burned (video will be reencoded) and mux (video will NOT be reencoded). --I would like to have both options. And video and audio both have a passthrough option which I would like to have.--
I've looked at the MP4tools "package" and it seems it's just a frontend to ffmpeg. I'm hoping there's something similar in Linux/Ubuntu.