One Pass VBR v.s. Constant Quality

[kustomkla80]

Hello
I am using DVD2SVCD, and would like to know for a 1 hour 48 minute long movie, which would look better for putting it on 2 cdr's? Also what settings should I use to hopefully fill 80 minute cd's (I know it can't be 100% predicted). Should I frameserve or not?
Thanks.

[fossil]

if you make good SVCD it should take about 60 mintues of video on each CD. so i say span in on 2 cd would make really good svcd

[mrj03]

Hello
I am using DVD2SVCD, and would like to know for a 1 hour 48 minute long movie, which would look better for putting it on 2 cdr's? Also what settings should I use to hopefully fill 80 minute cd's (I know it can't be 100% predicted). Should I frameserve or not?
Thanks.

I've made 100+ movies using DVD2SVCD with GREAT success..... I use 2-pass VBR and set all the BITRATE CD Sizes to 800.

[kustomkla80]

Thanks, but I've used two pass vbr in tmpgenc and multipass vbr (4) in cce, but I want to try constant quality and one pass and want to know the ideal settings for them.

[sterno]

There are no "ideal" settings for one-pass VBR or CQ modes. If you want to more or less exactly fit your movie to two CDs you must test by using some file-size prediction method to determine the setting you need. Size prediction can be pretty good, but don't expect the same accuracy you would have with 2-pass VBR.

The forums at http://www.kvcd.net/ include a lot of information on size prediction because the kvcd stuff all uses CQ encoding, but you don't have to use those templates to do it. It seems to work well enough as long as you're not trying to IVTC the material at the same time.

[puertorican138]

You could use a bitrate calculator in the Tools Section to figure out the average bitrate for a 108 minute movie on 2 CD's.

Hope That Helps!!! :P

[puertorican138]

Here's the Official DVDRHelp Bitrate Calculator:

https://www.videohelp.com/calc.htm

Hope That Helps!!! :P

[puertorican138]

FitCD is the best bitrate calculator for VCD/SVCD.

[kwag]

It seems to work well enough as long as you're not trying to IVTC the material at the same time.

Hi sterno,

KVCD prediction works perfectly well with 24fps sources IVCT'ed or not
The prediction formula is tightly coupled to the max frames per GOP of 24. So it will work the same with a .d2v (Force FILM) or with a 24fps source.
If you're using TMPEG, you might want to drop 2-pass mode and use CQ instead. TMPEG's CQ mode is far superior in quality than it's own 2-pass more 8)

-kwag

[sterno]

The 2-3 times I tried to use size prediction with Decomb or GreedyHMA on a TV capture I aimed for an output of about 700MB and ended up with something between 500MB and 600MB.

[kwag]

The 2-3 times I tried to use size prediction with Decomb or GreedyHMA on a TV capture I aimed for an output of about 700MB and ended up with something between 500MB and 600MB.

You were probably using less sample snapshots than the number required. Possibly decomb or GreedyHMA fooled Sampler (if that is what you were using ) and took less samples than the ones required for accurate prediction from your capture. Try the manual method below instead of sampler. Add this to the end of your .avs script:

###--------------------- Start Of File Size Prediction ----------------------###

IL = Framecount / 150 # interval length in frames
SL = round(Framerate) # sample length in frames
SelectRangeEvery(IL,SL)
## MPEG size = ((Total frames/Framerate)/150) * (MPEG sample file size * .98 ) ##

###------------------------End File Size Prediction--------------------------###

That should give you about ~2% final size precision

-kwag