That is one method, but if you have codecs, you CAN record directly into AVI - or rather, you COULD - I heard steam cut out AVI support.
IF you have no issue with non=AVI format, you can use other codecs and get outputs in different formats I *BELIEVE* [don't quote me on this YET].
If you have quicktime, you CAN use the h264 codecs - which, on a Mac, I am forced to use - with the resulting output being an MP4 [720P].
ALSO, if not noted before, do note things like:
- How in demo playback, if recording TTT, you need to click the buttons for the Detective/Traitor upgrades, and how if you hold down tab to see the player list in game while recording a demo, it will do that in the playback on its own [and how using txtchat doesn't show the box/record-ee typing into the box, just the output in case anybody questions why that is so].
ALSO, I would recommend a naming convention to make it easy to find demos if you record a LOT of demos.
I use:
"dem_[gamemode]_[mapname]_[date in MM-DD-YY]_[timestamp in HH:MM[AM|PM]"
but whatever you use works too.