Let me add my two cents - without hurrying anyone, just to add some perspective into consideration.
I managed to find an app which seems to download multiple 5.1 audio tracks per video (all tracks, if selected) and manages videos in bulk (e.g. per season or per show), but I use it usually only for this, as it's not decrypting (but reencoding) video stream and it's buggy. AnyStream, on the other side, simply downloads tracks and decrypts them if necessary, but sometimes I've got a choice:
- to have a single file with all subtitles and single audio track
- or try struggling with the other program, possibly setting up AnyStream to save subs in TTML (SRT seems to be buggy, as it doesn't save some languages properly) and playing with some muxing software.
Considering that I'm trying to have possibility to watch content on "dumb" or offline devices, I sometimes watch movies in different combination:
- In original, especially if it's a particular English variant or other language I know, possibly with captions
- With assistive description for low-vision/blind viewers, if the original track supports one
- In my native language, if available (usually with subs of "forced" type)
- Combo of previous two points - my language with assistive description
I would like to see additional audio support, as it is considered in feature wishlist thread, because right now I have either a single file per video (but with single audio only), or I have to play with external tools, possibly with several manual edits (e.g. when some subs are forced). Basically what I would like to achieve is to have single video with all needed audio tracks and all subs - just for my comfort of watching on my "dumb" or older devices, when I, for example, I can't understand or properly see something and need audio clarification (many NF shows have audio track with assistive description in movie's original language), possibly with proper language/feature label and "forced" tag, if possible).
I prefer using devices as long as I can without putting too much effort, but I'm writing it because I see I'm not alone in using older ones - many people with disabilities used Windows XP long after its support ended, nowadays I still see people with Windows 7 or 8.1 because switching to Windows 10 is too cumbersome for them. The other thing is an experience as native as possible - I would like to see an option where VoD services are gathered in single interface with unified control, but until then (if it ever happens) I prefer to download movies/shows I like and watch it my way. Without struggling with hell of format mess and all the muxers.
Sorry for long post, hope I did not bother too much. Just wanted to point why the feature may be important.