I’m not sure if this is what you’re looking for…but if you have multiple video files and just want one with multiple audio streams, you can combine them into a single file using the free tool MKVToolNix. This assumes the videos are the same length to keep them in sync.
Not quite, but that is good option to keep in mind. Once I have a system going, should not be too bad if done gradually.
Really just wondering if there's a downloadable database of movie audiotracks.
Never stumbled upon audio tracks only. Just movies with multiple languages or foreign language tracks only. Grab those and remux as the other poster wrote.
What I did stumble upon are comedic audio commentary tracks which can be played alongside a movie. MST3000 and Rifftrax come to mind.
You can download the French movie and take the track with ffmpeg
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