Jay_S
08-28-07, 04:37 PM
Good afternoon,
I have the Optoma HD70 1280x720 DLP projector. My modest and almost obsolete HTPC employs a Radeon 9600XT graphics card, and I have powerstrip installed. The 9600XT is connected to the projector via DVI-HDMI cable.
I have been living with 1280x720, 60Hz for a while, and it's ok. But (of course!) I think it can be better. So I'm trying to reduce judder. I believe that I can do this by setting Powerstrip's vertical refresh rate at an exact multiple of film's 24 FPS (or 23.976 FPS). Based on other posts in these forums, I believe my HD70 can output 48 Hz.
I believe Powerstrip is capable of MUCH more than I actually need it to do. What I mean is - without powerstrip, my HTPC can output 1280x720, 60Hz no problem to the projector, and everything is pixel perfect. I don't need to adjust resolutions or porches - I just need to be able to set 48 Hz vertical refresh rates.
With powerstrip, I can manually set 47.952 Hz and it will lock onto that frequency. I've also tried manually setting 48 Hz and it adjusts up and locks to 48.001 Hz. When I "apply" either of these frequencies, the HD70 will re-sync and display "1280x720, 48Hz".
But I think this just means that my projector can ACCEPT 48 Hz, not that it's technically outputting 48 Hz.
I can't hear the colorwheel spin down when changing refresh rates, but my ears are not so good anymore.
The question: Is there any way for me to objectively determine if the projector is outputting at 48 Hz?
I tried Re-Clock in combination with PowerStrip and got MORE "judder". Although reclock + ffdshow + limitedsharpen + etc is probably just too much for my lowly P4 (CPU usage averaged 70-80%), and what I am calling "judder" may have been dropped frames.
I also tried using re-clock WITHOUT powerstrip, sending 1280x720, 50Hz to the projector (which it also syncs to). The video is nice and smooth, but the pitch-shifting is too distracting.
Any suggestions?
Jay
I have the Optoma HD70 1280x720 DLP projector. My modest and almost obsolete HTPC employs a Radeon 9600XT graphics card, and I have powerstrip installed. The 9600XT is connected to the projector via DVI-HDMI cable.
I have been living with 1280x720, 60Hz for a while, and it's ok. But (of course!) I think it can be better. So I'm trying to reduce judder. I believe that I can do this by setting Powerstrip's vertical refresh rate at an exact multiple of film's 24 FPS (or 23.976 FPS). Based on other posts in these forums, I believe my HD70 can output 48 Hz.
I believe Powerstrip is capable of MUCH more than I actually need it to do. What I mean is - without powerstrip, my HTPC can output 1280x720, 60Hz no problem to the projector, and everything is pixel perfect. I don't need to adjust resolutions or porches - I just need to be able to set 48 Hz vertical refresh rates.
With powerstrip, I can manually set 47.952 Hz and it will lock onto that frequency. I've also tried manually setting 48 Hz and it adjusts up and locks to 48.001 Hz. When I "apply" either of these frequencies, the HD70 will re-sync and display "1280x720, 48Hz".
But I think this just means that my projector can ACCEPT 48 Hz, not that it's technically outputting 48 Hz.
I can't hear the colorwheel spin down when changing refresh rates, but my ears are not so good anymore.
The question: Is there any way for me to objectively determine if the projector is outputting at 48 Hz?
I tried Re-Clock in combination with PowerStrip and got MORE "judder". Although reclock + ffdshow + limitedsharpen + etc is probably just too much for my lowly P4 (CPU usage averaged 70-80%), and what I am calling "judder" may have been dropped frames.
I also tried using re-clock WITHOUT powerstrip, sending 1280x720, 50Hz to the projector (which it also syncs to). The video is nice and smooth, but the pitch-shifting is too distracting.
Any suggestions?
Jay