|
|
| nmace85 |
| Posted: Dec 10 2002, 02:21 AM |
 |
|
Unregistered
|
i'm capturing video from a VCR(old home movies) with virtualdub. i'm capturing with the Huffyuv codec. so after it's captured i can run it through virtualdub and apply filters and such and as long as it's not a filter that requires it to be recompressed....i don't loose quality right? or can it be compressed(still with huffyuv) and not loose quaity?
my second question is a little more complicated. i'm capturing at 720X480 and then feeding it through Tmpgenc to compress/resize it to a VCD file. this video isn't of the greatest quality in the world. what filters would you recommend i apply to it before it's converted to a mpg? there is an annoying little line across the bottom. is there anyway to get rid of that? what about re-sizing it to a 4:# ratio?
i'm still getting all of this video stuff straight in my head. i know just enough to know that i don't know nearly enough 
Nathan |
|
| Morsa |
| Posted: Dec 10 2002, 06:14 AM |
|
|
Moderator of the Vdub support board
Group: Moderators
Posts: 640
Member No.: 246
Joined: 9-September 02
|
You can compress a source with huffyuv as many times as you want without degrading quality as far as you use RGB not YUV. |
|
| S_O |
| Posted: Dec 11 2002, 01:38 PM |
|
|
Vdubmod Alpha Testing Team
Group: Vdubmod Alpha Testing Team
Posts: 102
Member No.: 57
Joined: 25-July 02
|
| QUOTE | | You can compress a source with huffyuv as many times as you want without degrading quality as far as you use RGB not YUV. |
You mean when I first compress from YUV2 (the output of my tv-card) -> Huffyuv I loose quality? I thought it´s lossless? Or do you mean when I convert from RGB -> YUV I lose quality? There I lose quality of course, also I cannot see any difference and later it´s compressed to YUV in XviD/DivX anyway. |
|
| Morsa |
| Posted: Dec 11 2002, 07:12 PM |
|
|
Moderator of the Vdub support board
Group: Moderators
Posts: 640
Member No.: 246
Joined: 9-September 02
|
If you compress to huffyuv a source in YUV2 using YUV2, it is supposed not to loose quality.
But if you convert to RGB and then to yuv2, changing between colorspaces several times you are loosing quality.
I mean, if you are using Virtualdub in full processing mode remember that it uses RGBA as its internal colorspace, so if you use huffyuv thru Vdub compressing in YUV2 you are in fact loosing quality in every recompression.This thing doesn't apply if you use Huffyuv in RGB. |
|
