Mupen64Plus, "original" framerate, and VSync

zumpiez · 15 January 2017 03:37

This is a somewhat fiddly question, so bear with me

I was messing around with Rayman 2 this morning, and I was running into problems. Everything would be fine for a few minutes, then the audio started stuttering abruptly and the game ran at maybe half-speed. I could temporarily recover from this state by fastforwarding or toggling between windowed and full-screen, but after another minute or so it would regress. I dug around for a while, thinking that I was having performance issues with a shader or something like that, but I found that I can do either of two things to correct the problem:

In the Mupen64Plus core options, I can set the framerate to “fullspeed” (default “original”) – Retroarch reports a framerate that fluctuates in the 30s and 40s when this is set to “original”, but stays at a solid 60 if I set it to “fullspeed”. This is a fine workaround, but I prefer the more authentic look of “original”.

OR

I can turn off vsync. This is not ideal for obvious reasons, but the game plays at the correct speed and the sound doesn’t skip.

What’s going on here? Is the audio synchronization getting confused by Mupen’s reported framerate? It seems like there should be a way for Mupen to emulate the game at the “real” framerate while still drawing to Retroarch at 60fps. (I’m not literate on how Libretro delegates getting a frame from the core so forgive me if this is nonsense)

I tested this on the 10/28 Beta and the 12/25 nightly.

Any help on getting this working right is very much appreciated!

edit: Grammar.

Kaan · 15 January 2017 06:08

Bumping this, have the same issue.

nin2020 · 15 January 2017 08:59

I GOT IT!!!

How to run enulator at full speed

1.) Choose Rom and go in-game. 2.) Open the core menu through the iOS interface by touching any open space between the retroarch icon button. NOT the button itself!!! 3.) Open “Settings” and just scroll through the settings. Don’t make any changes 4.) Leave menu and resume emulation.

You will notice the scale of the resolution shrink a tiny bit (not enough to cause a huge difference), but you will have a PERFECT frame rate and refresh rate.