avid_dk wrote:
clafournaise wrote:
Is it a fair summary to this thread that everyone having wobbly picture problems EITHER:
1) Has a TV that doesn't support 720p, AND/OR
2) Is using an HDMI to DVI bridge device?
Just for further clarification on point one, *a TV that doesn't support 720p with an HDMI connection*.
Yes to #2 but NO to #1. I've sent 720p signals to my DVI input many times. I've done it with computers where I set the resolution myself (both Linux and Windows PCs) and I've done it with a DirecTV receiver where you can select the resolution of the output signal to anything from 480p up to 1080p (I used it as both 720p and 1080i at times and both worked fine).
So, I get the wavy lines and my TV does support 720p.
I'm going to spend some time, see if I can consult with someone that knows more about these signals and what might cause this artifact. I'm fairly certain that attempting to play a 720p signal on a TV that only supports 1080i would result in either a black screen or a truly unviewable video. You can see from my Youtube clip that this is quite viewable. My gut says that we have a signal timing issue. I've had analog signals hooked up to projectors before and observed something similar when the timing of the signal was outside that supported/expected by the device.
Also, despite the fact that the video is digital I'm pretty sure there's still some pretty basic video signal timing parameters necessary to keep the devices in sync (front-back porch pixels, blanking lines, etc) and if one of those was non-standard then it's possible we'd get something that was close to correct but would not be rendered perfectly on our TV because it was slightly out-of-sync. But I'm talking way over my head here! I have only a passing practical knowledge of these things and can't say for certain any of it applies in this situation.
Seth