[HELP] What are the prerequisites for Level 4.2?

[Selur]

I'm currently running an encode using Filtering -> Speed Change -> Change speed: 50 fps selected, though will that alter audio?

The will change the output frame rate. And no it will not change the audio.

I couldn't figure out a way of easily encoding a small segment through the GUI (like -ss 00:03:00 -t 00:00:30), forgive my ignorance.

"Config->Internals->Cut Support" needs to be enabled, to allow settings start&end time in the Base-tab.

Cu Selur