que enc encoding getting blocks of pixels

[resohed]

using 8000cbr & slow & extreme ac3 384 2 pass. captured as 720 x 480 uncompressed avi from sony vcr. at times it all looks good and then blocks will appear & then dissappear

[gadgetguy]

We need more information.
Since VCR is an analog device, what method did you use to create the uncompressed avi? Is it really uncompressed or is it DV-AVI (Type 1 or Type 2)? Did you drop any frames in the process? Did you review the avi before attempting the encode? What are you encoding to? What are you playing the encoded video in when you see the blocks? Can you locate the "blocky" frame(s) when stepping frame by frame? Why 2 pass for 8000cbr? What slow and extreme settings have you set?

[resohed]

since i posted this i tried all the que enc settings the same but checked use vbr. the blocks seem to not be there now when encoding the same segment .
settings i used for que enc:
8000 cbr-high quality-2 pass-mpeg2- (under advanced options)- extreme & slow settings-interlaced incoding-top field first-9800 max bitrate-ac3 384 audio

as i say i checked the use vbr box & reencoded with better results. when i check each file with media info it says the first(blocky) has bit rate 8000 cbr & the second with vbr has 9800 bit rate cbr. why would it say the vbr file has cbr of 9800? is that 9800 total including audio? i seem to recall that 9800 total is high mark for dvd campatabilty right? would a 1 pass be just as good with a high bitrate? how much do you think i'm gaining with slow & extreme settings? it does take forever. 15 minutes takes about 2 hours or so on 3 ghtz conputer. i captured from composite to 7800gt nivedia card. used virtual vcr. media info says the avi is uncompressed yuv 16bpp. i don't think i've been dropping that many frames. used power dvd 5 to view. what does it mean when the que enc encoder says there are x amount of possible overflows after encoding?

[gadgetguy]

why would it say the vbr file has cbr of 9800?

I don't know unless it's reporting the max bitrate.

is that 9800 total including audio?

Yes the combined audio and video max for DVD is 9800. QuEnc will allow for higher values than this if your video is not destined for DVD so you should use a bitrate calculator to determine the correct bitrate.

i seem to recall that 9800 total is high mark for dvd campatabilty right?

yes

would a 1 pass be just as good with a high bitrate?

it depends on the source, but if you are very close to the max then nothing can be gained by using vbr and 2-pass.

how much do you think i'm gaining with slow & extreme settings?

Probably very little. In the readme notes the author advises against using this setting as experimental.

what does it mean when the que enc encoder says there are x amount of possible overflows after encoding?

I've never received that message but I would assume that it's pointing out that at some points in the encoded video the combined audio and video bitrate exceeds the DVD specs. It's just warning you in case your destination is DVD.