MPV is visually dropping frames

[aslpavel]

MPV is visually dropping frame (it is not really dropping them on the player side) this is not happening for the same file if I ran it in sway for example. I'm not really sure how to debug it, if you need more information please let me know

System Information

• niri version: niri 0.1.10-1 (unknown commit)

• Distro: Arch Linux

• GPU: AMD 780M as part of AMD Ryzen 7 7840U

• CPU: AMD Ryzen 7 7840U

[YaLTeR]

Well I'm not sure what I can do with this little info. I use mpv myself, works fine here.

[aslpavel]

I have recorded tracy profile, never used this tool before so I have no idea where to look
niri.zip

[aslpavel]

I have just enabled variable-refresh-rate and I do not know if it fixed things or just hid the problem. But visually it looks much smoother, I have created another tracy profiler for comparison
niri-1.zip

BTW tracy GUI crashes on niri but runs on sway:

$ tracy
wp_viewport#16: error 2: source rectangle extends outside of the content area

tracy.log

[YaLTeR]

Thanks for the Tracy recordings.

I have recorded tracy profile, never used this tool before so I have no idea where to look

There's barely any niri work visible here. I suspect the problem is in how mpv schedules frames on your setup.

I have just enabled variable-refresh-rate and I do not know if it fixed things or just hid the problem.

This also hints at that.

Maybe you have a weird mpv display-resample setting? I suggest turning it off, especially when watching with VRR.

BTW tracy GUI crashes on niri but runs on sway:

For me it sometimes crashes like that on niri, but most of the time it runs fine. I suspect there's a race condition in Tracy itself and mesa.