as an example: I have 2 MKV videos with 3 audio streams (English, French and Mandarin) 2 subtitle streams (English and Mandarin)
The streams can appear in any order. like on the first video, Mandarin is the first audio stream but on the 2nd it's using French. Same situation with subtitle.
what I want to auto-select the Mandarin audio and English subtitle without having to specify the stream number (like using -map perhaps?).
Is this possible? If yes, how?