cropping problems

[jsdspif]

when I crop in virtualdub , either as I capture or after when I process it with a filter to crop , it looks fine on a burnt dvd on my computer but playing the dvd on my tv it gets some very obvious artifacts . If I don't crop things work out fine . I can also use the image mask function and that's ok also , but if I do any cropping it won't play properly on tv . I've tried a lot of different settings but I can't get it to play correctly on tv . I capture with huffy and then do my filtering and save it with huffy and then burn to dvd . Without any cropping things work fine , but if I do any cropping it doesn't play correctly on my tv . I thought some one may know what I'm doing wrong .

[jagabo]

DVD requires a 720x480 frame size. If you crop a video it will usually be stretched back to 720x480 to make a DVD. With interlaced video that will cause comb artifacts if the software doesn't handle it properly. If there's junk at the edges of the frame that you want to get rid of mask it out instead of cropping. Use the Fill filter in VirtualDub.

[jsdspif]

fill works a lot better but also doing nr filtering it still seems to throw in artifacts occasionally . I wish I could "get inside " virtualdub and in the mask image in the capture filter change it so it doesn't take any off the top and a little more off the bottom , because that seems to have no negative impact on playing the dvd back on my tv , where if I use the capture cropping it does seem to have a negative impact .

[jagabo]

If you are getting artifacts after filtering with the original frame size (ie, using fill to black out noise at the bottom of the frame, or whatever) -- that's a filtering problem. You may be using non interlace aware filters. Even interlace aware filters can cause artifacts. It's an inherent problem with interlaced video.