l use retro arch to play older titles would that be ok for a speedrun
You must use Project64 1.6 or 1.7. All other emulators and versions (such as Mupen64/Bizhawk/Project64 2.0+) are banned. You must use the default settings for emulation (e.g. Changing the graphics plugin to do GIM is not allowed).
So no, you cannot use RetroArch.
Recently, many longer runs submitted as Twitch highlights have had parts of their audio muted due to Twitch's automatic copyright detection, the most frequent case being long sections of Lost Woods music. Some vods will even give a network error at these parts which can cause several minutes of foot