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View Full Version : Fix chroma from ATI's tuner


ajp_anton
10th May 2010, 22:35
I've captured some video game footage with an old Radeon card's ViVo (using composite video in).

The chroma behaves a little weird though, with a 4-frame pattern.
How do I deinterlace the video and get the chroma stable?

Sample (20 frames, huffyuv):
http://www.multiupload.com/9GDSSZ5R9F

Lyris
11th May 2010, 00:55
Is this a PAL-60 signal? If so, I never worked out how to get around that.

ajp_anton
11th May 2010, 01:41
It's PAL60 yes. So it's a known and unfixable problem?
The best I've been able to do is

separatefields.converttoyv12.weave

and then deinterlace.
Note that a simple converttoyv12(interlaced=true) will screw up the chroma horribly.

Lyris
14th May 2010, 00:36
I think it's more to do with the fact that PAL60 is non-standard (someone correct me if that's wrong).

rfmmars
14th May 2010, 00:44
I think it's more to do with the fact that PAL60 is non-standard (someone correct me if that's wrong).

Yes there be color problems trying to use Pal with a 60 vertical field. No different than the problems with NTSC 50

ajp_anton
14th May 2010, 04:28
I don't really care why PAL60 isn't properly supported by the tuner, I just need a way to deal with it.
I have two other tuners that handle PAL60 just fine. Their only problem is their low quality. For everything except PAL60 ATI has a much better image, and even with PAL60 when capturing still images and averaging the frames (average out the chroma flickering), the ATI tuner is unbeatable.

What I wrote in my last post does a pretty good job, the flickering is not really visible on "normal" content at 60fps. I was just wondering if there was a "better" way.