mac/vulkan: set --macos-render-timer to feedback by default

[m154k1]

This changes frame timing mode to presentation feedback by default on macOS.

From #13825:

in the long run this is supposed to be the default
on my end this works a lot better on higher refresh rate displays (>120hz)

[github-actions]

Download the artifacts for this pull request:

Windows

• mpv-aarch64-pc-windows-msvc
• mpv-i686-w64-mingw32
• mpv-x86_64-pc-windows-msvc
• mpv-x86_64-w64-mingw32

macOS

• mpv-macos-13-intel
• mpv-macos-14-arm
• mpv-macos-15-arm

[Akemi]

i don't really have a big sample size (besides myself). what are your experience with macos-render-timer=feedback? is it considerable better than the current default or the other modes?

[m154k1]

what are your experience with macos-render-timer=feedback? is it considerable better than the current default or the other modes?

I've been using it since it was added, and it works perfectly.
The one thing that is definitely noticeable - it has zero vsync jitter with --video-sync=display-* on low refresh rate displays (other modes have ~0.01-0.03 jitter).

--video-sync=display-* still doesn't work on the built-in 120Hz display regardless of the mode, but I don't think it's needed here.

[Akemi]

yeah, the vsync jitter is normal, it's supposed to be 'perfectly' timed.

what is the problem with 120hz built-in display? i am not aware of it and it does work on my end. is it worth opening an issue for that?

i am not sure if we should change the default just yet and am still contemplating. need some time to think about it and weigh the pro and cons.

[m154k1]

what is the problem with 120hz built-in display?

It drops a lot of frames when running with --video-sync=display-*.

is it worth opening an issue for that?

Nah, there's no point in using it on >=120Hz and --video-sync=audio works fine.

[hooke007]

Probably #11122
I can reproduce it on mac too with the lower refresh rate.

[Akemi]

i don't want to keep this in limbo any longer. there are still some slight weirdness i noticed with feedback and i want to investigate those a bit more. going to close this and put off that change.