@mitu Thanks. I found out that I can record N64 using the retroarch menu and setting Use GPU Recording to on (although it is extremely choppy and unplayable). Does someone know what is the ffmpeg option equivalent to the retroarch Use GPU Recording to put in the custom recordconfig file? I tried hwaccel = auto but it does not seem to work.
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first