DVDx Xvid 2pass outputs wrong filesize

[Jaded101]

I have racked my brains and searched all over websites, forums, and newsgroups to find some answer to this. DVDx's homepage is a joke. The software is free but you have to pay 12 bucks to get the guide, faq, and in their forums??? What a crock.

Anyways, as my subject states, whenever I use 2pass and input the target filesize I want, it comes short, not just by a little but a lot. I wanted a 1400MB file, instead I got 1000MB. I have fiddled with DVDx's options to every combination I can think and still get the same result. All I want is to use Xvid 2pass and Lame MP3 128Kbps for audio. It works fine with 1pass but the quality is not decent enough for me. I have tried testing on small bonus clips (obviously I'm not going to wait a few hours everytime to test this) and if I do only video, it STILL does not encode to the right size (I recalculated for no audio, etc). If I do a store to WAV, then for example if I want a 50MB file, the video will be some 30MB and the WAV will be 20MB even though I input the filesize as 50MB it counts the audio into that for some dumb reason.

I do not have this problem using other software such as DVD2AVI and Virtualdub, but I like DVDx because it combines the steps making it easier...maybe that's the damn problem. Please provide assistance if you have some insight. Since I had a hard time finding anything related to my problem, I think this is something I'm doing wrong.
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Everything is set properly. It enodes the whole movie just fine, just not to the specified file I tell it to.

I'm using Nic's Xvid and I know how to do math. The calculator tells me exactly what size I should be making it and I'm inputting everything correctly.

Here is exactly what I do. Open up the DVD file to encode, audio is set to LPCM-44.1KHz. Output frame-NTSC29.97. Detect prog. 24KHz selected. No subtitles. iDCT set to FPU (I like the quality). A/V Sync checked. RAM Size is 512MB (I have 1GB so no, memory is not even an issue). No deinterlace filter.

For output, Audio set to 128KBps Lame MP3. XVid 1pass settings: 2-pass-1stpass, ultrahigh, quartelpixel, chroma motion, global motion, video stats same as 2pass-2ndpass. On 2ndpass, same as above, target file size for example 50MB file, 48,214KB, discard 1stpass (set for both 1st and 2nd, all the guides I read have this enabled). I use RGB24, Zoom is at full, Bicubic, Volume at infinite, that's it.

If I messed up somewhere in there or missed an option please let me know since no one has this problem with DVDx, it has to be me.

[jntaylor63]

I would give autogk a try.
For the quality and ease of use, it can't be beat for DVD to XviD.

However, you should always plan for some overhead when encoding video.

[Gazorgan]

Sometimes you just can't. I mean it simply doesn't need 1400 MB's to do the movie. This is true when you use 320x240 resolution on shorter (90 minute) movies.