Possibly a useful doc for ya then: https://developer.mozilla.org/en-US/docs/Web/Media/Formats/V... . And beyond that it depends on the OS, so windows/linux/mac/ios/android/etc will all vary.

Some of this is also probably due to using ffmpeg directly, tbh. It's very happy to produce irrational combinations of things that are technically allowed by specs but not implemented anywhere in practice, often exacerbated by it trying to preserve metadata / colorspace / etc where technically possible.