I have just set up a machine with mythtv and its humming along quite nicely. Unfortunately my recordings all have artifacts in them when I play them back.
The sort of effect I'm experiencing occurs primarily when there is a scene change, or a camera switch, like when you have two people talking to each other and the picture keeps cutting from one face to the other. I believe the proper term here is 'keyframes' but I'm not up on my compression terminology, so correct me if I'm wrong. Anyway, intensely dark portions of these frames (read: someone's black hair, the beret of the guy on MythBusters, etc.) hold what looks like random garbage until the object in question moves and these squares get rewritten with new color information. This occurs on a square-by-square basis (with lower quality settings it becomes very obvious that it occurs on a per-pixelated basis, similar to a poorly compressed picture). The artifacts can be as simple as a ghost of something from the image before, but often manifest as whitish lines on a darker background. I'm sorry I don't have a screen capture of this, but I'll try to get one tonight. I haven't tried using MPEG-4 yet because the box its running on is pretty wimpy. I *have* tried just about every level of quality on RTJPEG, every combination of deinterlacing filter (including no deinterlacing) and nothing seems to have helped. I'm out of ideas, personally, and if anyone has any hunches they would like me to follow up I'd be grateful. Machine Information: ~1GHz P3 256MB RAM Winfast TV 2000 XP (Expert - cx88 driver) Onboard AC97 audio chipset MythTV Version 0.18.1 (running on a Gentoo system, the actual ebuild is mythtv-0.18.1-r2) I've used this card without problems on another machine (and an earlier version of mythtv -- 0.15 I think?) Any other information or test results I'd be more than willing to provide. Thanks in advance... _______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
