If you use the "turbo" feature to fast forward a game while recording an AVI, all of the frames of video get recorded correctly, but the audio will be unusable (fast-forwarded / garbled / truncated).
I think turbo is too skipy for AVI, it has quite some features for additional speedup. So using maximum speed for AVI is more like the intended way, not turbo.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
I think turbo is too skipy for AVI, it has quite some features for additional speedup. So using maximum speed for AVI is more like the intended way, not turbo.
Closing this and moving it to my personal fork to remember for later.
https://github.com/bbbradsmith/fceux/issues/2