VDPAU vsync performance, dependent on h.264 features

ir123 · 07-31-09, 12:04 AM

I haven't done extensive testing but as far as I can tell, a certain type of tearing in videos seems to happen or get exacerbated when you use too many reference frames in h.264 encoding. Maybe also dependent on the hardware not being fast enough? While being watched full screen on hdtv dimensions, I can observe some steady tearing near the top in dvd sized movies I ripped into avc1 with high number of reference frame (and perhaps also b-frames) encoding. I compare to videos ripped with 3 reference frames and it doesn't nearly as much, if at all. The video card is I think a value card and hardly the best (9600 GSO), but could a faster one overcome this or no? Any idea?

ir123 · 08-25-09, 04:47 PM

So nobody knows about frame references and b-frames and how it relates to vdpau performance?

play3r · 08-25-09, 05:19 PM

Try:

Section "Extensions"
Option "Composite" "Disable"
EndSection

in your xorg.conf

ir123 · 08-25-09, 06:01 PM

I know about that; I don't see much difference in anything.

Also I find it strange that 1080p videos are smooth while some dvd rips in h.264 (with high frame refs) stutter a bit and suffer the tearing, so it could be just the implementation, not a hardware speed issue, or it could be something totally unrelated, but then again what do I know; apparently the same as others.

07-31-09, 12:04 AM	#1
ir123 BANNED Join Date: Jun 2008 Posts: 92	VDPAU vsync performance, dependent on h.264 features I haven't done extensive testing but as far as I can tell, a certain type of tearing in videos seems to happen or get exacerbated when you use too many reference frames in h.264 encoding. Maybe also dependent on the hardware not being fast enough? While being watched full screen on hdtv dimensions, I can observe some steady tearing near the top in dvd sized movies I ripped into avc1 with high number of reference frame (and perhaps also b-frames) encoding. I compare to videos ripped with 3 reference frames and it doesn't nearly as much, if at all. The video card is I think a value card and hardly the best (9600 GSO), but could a faster one overcome this or no? Any idea?

08-25-09, 04:47 PM	#2
ir123 BANNED Join Date: Jun 2008 Posts: 92	Re: VDPAU vsync performance, dependent on h.264 features So nobody knows about frame references and b-frames and how it relates to vdpau performance?

08-25-09, 05:19 PM	#3
play3r Registered User Join Date: Jan 2009 Posts: 10	Re: VDPAU vsync performance, dependent on h.264 features Try: Section "Extensions" Option "Composite" "Disable" EndSection in your xorg.conf

08-25-09, 06:01 PM	#4
ir123 BANNED Join Date: Jun 2008 Posts: 92	Re: VDPAU vsync performance, dependent on h.264 features I know about that; I don't see much difference in anything. Also I find it strange that 1080p videos are smooth while some dvd rips in h.264 (with high frame refs) stutter a bit and suffer the tearing, so it could be just the implementation, not a hardware speed issue, or it could be something totally unrelated, but then again what do I know; apparently the same as others.