Fixed browser impersonation issues, updated ffmpeg

[joesixpack]

• [X] I am the original author of this code and I am giving it freely to the community and Pinchflat project maintainers

[kieraneglin]

Hey there! Thanks for the submission (:

~~Would you mind telling me a little more about the yt-dlp -> yt-dlp_linux change? What's the practical impact of going from one to the other?~~

Edit: nevermind! I'm more up-to-speed on this and I see why this is needed now