Help with 720p

[engnz]

I'm using PDVD7 decoder hardware acceleration to playback my H.264 media over my 8600GT card (Forceware 169.21).

It works fine with 1080i but I get dropped frames with 720p. Same problem using PDVD and GBPVR to playback.

Since CPU is not a problem so I'm at a lost as to what else I can do to get 720p working. Any help or suggestions much appreciated.

[sub]

Pretty much the only things that are going to have an impact on this are the video decoder and/or video renderer, so try different combinations of these. Also try with hardware acceleration disabled to see if it makes any difference.

[stustunz]

whats your actual refresh rate set to ? 1280x720@50hz (has to be this not 60Hz)
also vertical sync under 3d settings should be forced on

when you say dropped frames what exactly does it look like
is it a jump
tear in the picture
a freeze
how often?

[sbiddle]

What OS and renderer combination are you using?

[engnz]

XPsp3 with VMR9 Custom renderer.

I need to clarify that I am viewing on my monitor not a TV. It is connected by DVI and has a resolution 1680x1050x60Hz. Dropped frames is noticeable as "jumping" in the video and I use fraps to measure the framerate which is never steady at 50fps.

It is much better in a small windowed mode at 50fps most of the time but pretty bad at full screen mode between 20-50. Forcing Vert Sync didn't make any difference.

How do I turn of Hardware Acceleration in GBPVR?

[sub]

How do I turn of Hardware Acceleration in GBPVR?

Its usually a setting in the video decoder you're using.

[stustunz]

you will get a jump every so often with 60hz
as it has to try and make the 25frames a second go into 60
needs to be 25 50 75 100 etc

the wait for vertical sync gets rid of tearing i wasnt sure exactly you meant by dropped frames

[engnz]

I can understand that 60Hz is not a multiple of 25 but how come then 1080i works perfectly and I'm getting 50fps consistently?

[stustunz]

interlacing maybe hides it better cause the frame rate that you see is effectively higher
which is the whole reason interlacing came about in the first place

[engnz]

Just an update. I've upgraded to the latest Nvidia drivers and all my problems went away