Help With Recording Comparison Footage

I’ve been playing the original GoldSrc games for some time now and I just got to Half-Life. There is a strong difference between this game and the original and I want to record footage to clearly convey how I believe Black Mesa is holding itself back. Does anyone have any suggestions for recording software? I’ve got a 1080p monitor but I don’t want to record the entire screen, just 720p in a 720p-sized window.

Source has a built in recording feature, but it can be kinda janky.

I don’t record footage foten, so I’m sure osmeone else has better suggestion, but from me, I’ve used Bandicam before, though it can do a number on your FPS (not as bad as Fraps in my experience, but sometimes it can be a bit noticeable).
Also, OBS works surprisingly well, though quality isn’t always great.

Alright. I’m concerned about recording while playing Black Mesa, but if I knock down the resolution to 720p and turn off a few graphical settings I should be okay.

use the "record ", “stop”, and "playdemo " commands in the console to record gameplay, stop the recording, and play back the recording, respectively. If you look around, there are a few ways to render these demo files; Console commands or just recording with fraps, etc. while the demo plays back. This system is used in a bunch of other source games, so there is help out there.

Using this has little to no affect on gameplay or framerate.

That does not work in GoldSrc though.

Also I tried FRAPS a few years ago and had an awful time with it. I have no intention of using it.

If you have a newer NVIDIA card you could use ShadowPlay.

Or something like OBS, which you normally use to stream games, but can be used to record locally.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.