https://www.youtube.com/watch?v=CMMwj2H8Vb4
-recorded Live
msi afterburner
-Set microphone record as the same button as mumble's push to talk. if you bound it to a mouse button, you need a seperate software. I use something called "push to talk solution for windows 7 and 8"
-choose encoder/frame rate/etc...
I have enough space and CPU/disk speed to use a lossless encoder (UT Video / Lagarith).
You can use x264vfw, but that's horribly out dated. Use OBS if you don't have disk space.
-Hide overlay on recording
-hotkey
-record
If you need to encode to h264 / x264, use obs but I'm not sure how it handles push to talk.