I've got all of my demos from my run and want to record them for my yt. I've done this with tf2 demos, using lawena. I'm 99% sure you can't use lawena with Portal. What's a good alternative for doing so? And does it have a queue option? (So I can add up all of my demos and record them)
use the command startmovie and run the demos using playdemo
This is a helpful guide i used when making a segmented run https://wiki.sourceruns.org/wiki/Source_Video_Creation
The only way to do it clean is to do what hat said. The clodo strat is that you record your game with OBS/XSplit/Mishira/Bandicam Playing many demos at a time isn't something I would recommend.
It was recently discovered that it is possible to set your mouse sensitivity to a value so high that the game considers it infinite, leading to several new glitchy techniques being discovered.
The rules have now been amended to ban these new techniques in both Inbounds No SLA Legacy and Glitchless.