Frame rate of the Display is not automatically adjusted to the movie

[Stylistic]

Hello

PowerDVD 19, Kodi 18.4 and VLC 3.0.8 are installed on my HTPC with Windows 10 1903.
The players of PowerDVD19 and Kodi adjust the frame rate at the start of the same movie, from 60fps to 23,976fps, at the end of the movie from 23,976 to 60fps.
With these two players, it works automatically, nothing has to be changed manually at the HTPC, which would also be very annoying.

A movie with a frame rate of 23,976fps is also forwarded to the TV with 23,976fps and not, as the VLC player does, with 60fps.

So it's not the HTPC or HDIM cable, but the VLC player, which simply doesn't adjust the TV's frame rate (fps) to match the movie's FPS.
Only the frame rate (fps) of the movie is adjusted to the current frame rate (60fps) of the TV. But this makes the movie longer or shorter and there are jitters.

So what PowerDVD17/18/19 and Kodi can do, the VLC player should be able to do that as well?

Probably it is trivial to set a hook in the settings too little or too much.

The question is only where or is it a bug in the VLC player 3.0.8?

[Rémi Denis-Courmont]

Adjusting the monitor frame rate is not going to fix jitter because the monitor is not in perfect sync with the computer clock or the audio DAC clock, whichever is used as the reference.

[Stylistic]

Thank you for the hint.
Sorry, I mean, every few seconds the movie jerks.
But the question is:
Why is the TV (display) frame rate not automatically adjusted to the movie?
With Power DVD and Kodi it works without problems.
The frame rate change at the start of the movie, from 60fps to 23,976fps, at the end of the movie from 23,976 to 60fps.
Only the VLC player plays a 23.976fps movie at 60fps.
Is it always like this in the VLC player?
Why?
Can this be changed?

[IceCool]

Hello.
I have same question. How to automatically adjust display refresh rate to match movie FPS with VLC player?

[Rémi Denis-Courmont]

In theory, that's only possible if your display controller and monitor support variable frame rate. But VLC does not currently implement support for that rare feature as yet (patch welcome).

[IceCool]

In theory, that's only possible if your display controller and monitor support variable frame rate. But VLC does not currently implement support for that rare feature as yet (patch welcome).

It is not a rare feature. PowerDVD, MPC-HC, Leawo player, DVDFab player has it. That's players i know. I am sure there is other players with that feature.

[IceCool]

Plus Kodi and MadVR.

[Rémi Denis-Courmont]

I've never seen a display with actual VFR support, so it is rare as far as I am concerned. Not that it makes any differences what your or my opinion is on the matter.

[Lukke]

I've never seen a display with actual VFR support, so it is rare as far as I am concerned. Not that it makes any differences what your or my opinion is on the matter.

Are you kidding? All TVs and computer displays can play a lot of different framerates - at least 23,97 fps, 24 fps, 25fps, 29,97 fps, 30 fps, 59,97 fps, 60 fps! When your TV is capable to play let's say only maximum at 4K@30fps and you play movie in 23,97fps - guess what happens. It will stutter as hell. When I was using MPC-HC, I was able to set automatic framerate change of the TV. So when the movie switched to fullscreen, MPC-HC changed TV framarate to 23,97fps so everything was running smoothly. I am curious if this functionality is in VLC as well. If not - that's crucial for me not to use VLC.

If anyone has an idea how to do it, please tell. Thank you!

[Rémi Denis-Courmont]

Do you even know what VFR means? Because you sure seem not to.

This is a niche feature that requires dedicated support from both the display controller and the monitor, and was originally intended for video games, not video playback.

And patches are welcome anyway.

[bakedlays5447]

Sorry for exhuming this thread but I’m compelled to say that, if by VFR you mean variable refresh rate, I don’t think that has anything to do with the discussion. This is not an issue of trying to change the refresh rate while you are playing a movie. It’s a matter of different videos playing at different frame rates. If you’re watching a movie on Netflix on your TV, it plays at 24fps; if you’re watching a TV show, it plays at 30fps. You don’t need a special TV to do this. The issue people are having is VLC not communicating with their TVs to have the refresh rate align with the frame rate of the video they’re trying to play, something streaming apps and other media players can do easily by default. This has nothing to do with variable refresh rate, as videos have a constant frame rate.

[Rémi Denis-Courmont]

Most media players sync on the audio clock, not the display. So no, even if VLC could adjust the refresh rate, jitter would still occur.

And again, patch welcome.