vob to xvid problem

[blas]

hi

i am encoding with dvd2avi avisynth then vdub.
i've made many movies with this method.
now i tried to encode my last man standing dvd
iam doing the same thing as usual

xvid 2nd pass settings:

video size: 1100MB (because audio is 300MB)
well the result is:

quality is perfect but 820MB always instead of 1100. only this movie?
why is that
i tried my old newbie way so gknot but the same ~820MB too
please help me

[celtic_druid]

What is the average quant? Also what was the min quant setting set to? 2 or 1?

Last thing, how big was the first pass size?

[blas]

hi.

pass1.avi is 3,33MB (3,493,444).
pass2.avi is 806MB (845,503,684).

xvid options:
quantization tab:
min i-frame quantizer: 2
max i-frame quantizer: 6
min p-frame quantizer: 2
max p-frame quantizer: 6
min b-frame quantizer:
max b-frame quantizer:

global:
b-frame ctrl:
max b-frames: -1
b-frame quantizer ratio: 150%
b-frame quantizer offset: 75
b-frame treshold: 0

i dont know howto see avg. quant, if this helps i'll show you MPEG4MODIFIER videoinfo

Packed bitstream: No
QPel: No
GMC: No
Interlaced: No
Aspect ratio: Square pixels
Quant type: MPEG

I-VOPs: 1516 (1,04%)
P-VOPs: 143702 (98,96%)
B-VOPs: 0 (0,00%)
S-VOPs: 0 (0,00%)
N-VOPs: 0 (0,00%)

well only this last man standing dvd sucks..
i've encoded omen2 tonight with the same xvid settings and its perfect,
lms became too small again, i tried it 4 times.

thanks in advance celtic_druid
bye

[celtic_druid]

If the first pass is 3MB's it means that you discarded it. You will need to get the actual filesize from the stats file. Then maybe you will see that it is 806MB's or so.

You can't have a 2nd pass larger than the first without quant 1's as the first pass is all quant 2's.

[blas]

how you mean discarded it?

i cant change the quant value-s in the first pass
btw with all this setting i ripped many movies successfuly
what shall i do?

[celtic_druid]

By default XviD discards the first pass. The avi from the first pass doesn't actually contain any video data.

If it is simply a matter of the codec being saturated then the fact that you never ran into this before simply means that you never saturated the encoder before. In other words you never tried to make a 2nd pass larger than the first.

[blas]

whats the solution then?

"In other words you never tried to make a 2nd pass larger than the first."

well 1st pass is always <30MB and second is 2cd big with no audio of course.

[celtic_druid]

As I said that isn't the real size of the first pass. Also as I already explained if you want the second pass to be bigger than the first then you need to use quant 1's, however with the default overflow settings you may end up oversized. Another solution would be to use a higher res or higher quality quant matrix so as to increase the size of the first pass so that it is larger than the 2nd.

[blas]

iam using MPEG as matrix. thas okey for me.
i'll try to set quant to 1,31,1,31 then

but honestly, i still dont understand this first pass thing. the first pass avi is always small, shall i uncheck the discard first pass in the xvid options?

[celtic_druid]

Like I said if you don't have that option unchecked the first pass avi doesn't contain any video, therefor its size has nothing to do with the real first pass size, which you can get from the first pass stats file. No need to actually create a 1st pass. If you do you should also disable fast first pass.

If the 2nd pass is set larger than the real size of the 1st pass and quants are capped at 2 then the second pass will never hit the desired bitrate.