Hi!
I want to solve some problems that result in unshmooth videoplayback and jitter. No hardly stuttering video - only slightly really hardly noticable jitter that appears after seconds of smooth playback.
--> No problem if I show the video on a 19" Computer Screen - but if I use a beamer the jitter becomes a problem.
--> How to see the jitter? There are some situations realy sensitive for jitter:
- fast but uniform paning cameras (a church dome, paning up a building front - fast paning into pictures and documents like offen seen in documentary...)
At first: No, I don't have a slow old machine and wonder wy my 1080p video is stuttering - and NO I don't have the well known audio sync problems. And Yes the problem I'm speaking about is affecting all video players and different computer systems.
I tryed to analyze what could be the cause of this:
01) CPU
The problem occurs even if I try to playback an unc. AVI 320x240 on a Core2Duo 2.66GHz - it's not CPU dependent.
02) Encoding
The Problem occurs even on commercial standard DVD's and unc. small test AVI's without audio.
03) Audio Sync
I had read a lot of these audio sync problems - to be sure I had tested different sound cards like the Terratec AUREON with adjustable buffer - no change - switched the VLC audio off and used video without audio - no change...
04) Display Frame Rate
Something I hadn't found much information about was the display frame rate - if the display refresh don't match the video frame rate (or a multiple of it) the video is jittering by force because the player can't resynthesize the needed video frames for the display timing.
This is the only point that made any difference to my video playback - with 50Hz disply refresh rate a PAL video played much smoother than with 60Hz default display refresh. (another point is that most modern 24" TFT's don't support 1920x1080@50Hz via DVI/HDMI - unusable for PAL playback! - Any suggestions for an affordable 1080p PAL video control monitor?)
05) Bios Settings - Overal System Tuning
I'd checked all the settings - changed timing settings - but it hadn't any affect at all.
--> As I realized even RAM Player showed jitter with 30fps footage on a 60Hz display... what is going on here??? It has to be possible to draw an image every 16,6ms to the screen...
Any good hints for me?
Best regards
Danko