Mpv: Vsync Jitter is always zero.

Created on 11 Sep 2019 · 3Comments · Source: mpv-player/mpv

mpv version and platform

mpv 0.29.0-385-g6e6ec33168 Copyright © 2000-2019 mpv/MPlayer/mplayer2 projects
 built on UNKNOWN
ffmpeg library versions:
   libavutil       56.35.100
   libavcodec      58.56.101
   libavformat     58.32.104
   libswscale      5.6.100
   libavfilter     7.58.102
   libswresample   3.6.100
ffmpeg version: N-94826-g558265d4bc

Reproduction steps

Shift+I to see the Vsync Jitter.

Expected behavior

Display the actual value.

Actual behavior

It is always zero.

Log file

https://0x0.st/zJUP.txt
2019-09-11 10-01-59 的螢幕擷圖

core video no-bug

Source

laichiaheng

Most helpful comment

This is not a bug. This is expected behavior since presentation feedback was implemented (it will really go that low).
Maybe we ought to increase the amount of significant digits in stats.lua though?

xantoz on 21 Sep 2019

👍2

All 3 comments

Doesn't it temporarily increase when you do seeking, window resizing etc.?
I suppose it is due to new Mesa OML sync for EGL:
https://github.com/mpv-player/mpv/commit/10a1b9808253dc67e19db2a0c4c360788b9e668e
Seems to be more robust than before regarding mistimed frames, so perhaps there is some truth to the lower jitter (not sure if constant 0 is realistic though).

aufkrawall on 17 Sep 2019

Yes, it increases when I'm seeking or resizing window.

laichiaheng on 17 Sep 2019

This is not a bug. This is expected behavior since presentation feedback was implemented (it will really go that low).
Maybe we ought to increase the amount of significant digits in stats.lua though?

xantoz on 21 Sep 2019

👍2

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