On Mon, 20 Sep 2004 13:39:12 +0800 Derek Fountain <[EMAIL PROTECTED]> wrote:
> The HOWTO says that "-d 2 is already better than VHS video (a > *lot*!)." Does that mean that if I'm capturing from a VHS source I > will gain nothing from using -d 1, and should always use -d 2? Or > does it mean that given a theoretically perfect source, capturing > with -d2 and then playing back would give a better picture than > capturing with a VHS VCR and playing back? The latter I would say. > I am capturing from VHS tape and intend to have the output display > on a monitor at about 512x384. To date I've captured using -d 1 and > scaled down. If -d 1 gives no benefit when capturing from VHS, would > I do better to capture at -d 2 and scale up? (By "do better" I > really mean "reduce processing time" - this old PIII-500 box takes > an overnight run to achieve pretty much anything :o}) What I do is use an old timebase corrector to clean up the signal then capture at D1. Then I deinterlace and denoise, crop off any noise at the edges then scale down to around D2. The worse the quality the more I scale down. The result usually looks better than the original VHS playback. You could capture at D2 but once you've cut off the edges you will have a very small video indeed. Scaling down serves to further reduce noise and improves sharpness. You should only scale up on playback. Timebase correctors are pretty expensive but "signal conditioners" or "copy enhancers" are almost as good and much cheaper. Martin ------------------------------------------------------- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 24. Go here: http://sf.net/ppc_contest.php _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
