Framerate problems

[vanfanel]

Hi there,

This core is showing a strange framerate behaviour.

Some background information:

-I am running RetroArch on KMS/DRM and on Wayland, in both cases with VSYNC ON and max_swapchan = 1 or 2, using the GLES or Vulkan video drivers.
-The core is rock-solid 60FPS, and for these experiments I even took it down to 320x200 internal resolution.
-There's nothing on this system interfering with the audio system, and RetroArch uses ALSA directly, there's no other sound server on my test systems.
-I have a ~60Hz HDMI monitor and RetroArch video is calibrated with only a 0.2% deviance.

This is the only core that behaves this way, that's why I am reporting:

-When Framerate is set to AUTO, movement is always smooth but some audio effects like opening doors sound full of a crackling noise.
-When Framerate is set to 60, audio is perfect but movement shows a small desyncronization once in a while.

So it seems to be a "pick your poison" situation with this core.
My guess is that 60 Framerate forces an exact 60.0000Hz timing, which is not well synchronized with RetroArch.
No idea on what's wrong with the AUTO Framerate, possibly something related to audio resampling only affecting this game, and only when Framerate is set to AUTO.

[inactive123]

I've noticed this issue now with 'Framerate' when set to 'Auto'. I believe @jdgleaver is going to look into this tomorrow.