YUV gives bad quality(?)

[Northpack]

Hi,

I am pretty new to this material, so hopefully I don't bother you with this question... i've a problem with GKnow. Well, as I first heard of SBC encoding I tried it the hard way via DVD2AVI -> VFAPI -> Nandub. It was a mess to went trough all of this configuration stuff, but in the end the resulting movie was pretty nice. After done that, I heard of GKnot and so I had to try it that way. I was fairly impressed of GKnot's abilities to compound all this stuff... great work! But here's my problem: I tried to encode the same movie (Seven Years in Tibet) as i did with Nandub before, so i made everything as described on the appropriate guides. At the end I got a movie on a little smaller resulution compared to the previous one (the compressibility test suggested so :cool: ) but unfortunately with clearly worse quality. That was not what I'd expected! The whole Movie was much too bright, the colors looked washed-out. As I loaded the stat files of both trials into the compressibility test, the first one gave out a 15% higher value! Obviously that results from the difference in brightness, but where does this difference results from? I know that GKnot does not convert to RGB colorspace. I strongly assume that this is causing the differences... but is it realy possible, that YUV output looks _so_ much worse compared to RGB? :confused:

Thanks for the attention (and sorry for my english... :o),

Northpack

[manono]

Hi-Your English is better than that of most on the boards, so I wouldn't apologize about that.

I'm not positive that this applies, but when you made your .d2v for the VFAPI method, you used the RGB colorspace, right (Video-Colorspace-RGB in DVD2AVI)? But when you made your .d2v for GKnot, did you switch it to YUV?

[TheWEF]

actually the colorspace setting in dvd2avi makes no difference at all.

unfortunately some people have playback(!)-problems with yuv-divx (the one encoded with fast recompress).

a) try to change your desktops color-depht.
b) get a new gfx-driver.
c) try a different player (sometimes bsplayer does the trick, sometimes it causes all the problems).
d) buy a new gfx-card.
...

good luck!

wef.

[Demone]

I dunno the entity of the problem, but I noticed that in bsplayer, forcing the RGB in the Preferences->Video, eliminates some background
shit(green, violet pixels and blocks attenuate), btw try to use Windows Media Player to see if u got the same problem there too.

[MaTTeR]

Originally posted by TheWEF
actually the colorspace setting in dvd2avi makes no difference at all.

unfortunately some people have playback(!)-problems with yuv-divx (the one encoded with fast recompress).

a) try to change your desktops color-depht.
b) get a new gfx-driver.
c) try a different player (sometimes bsplayer does the trick, sometimes it causes all the problems).



I can vouch for this as well. One of the above options will fix your issue. For me I simply changed the desktop color depth and relaunched BSplayer, all was fine.