Xvid Issues

[handtruck]

OK.. I'm doing everything right.. I think.

I'm inputing a video into VirtualDubmod (actually an avisynth script, I don't think it's importatnt, but I want to give all the info).

I'm doing a 2 pass xvid conversion. I do the first pass as "Twopass - 1st pass" and the second pass as "Twopass - 2nd pass" with a target bitrate of 1200 kbps. However, the final size comes out too big. This even happens if I enter as a target size (300000 KB). The files are coming out as 550000-600000. Note: there is NO audio (I combine them later), so that is NOT the issue.

So what could cause xvid to generate file sizes that are so much bigger than what I ask them for?

Please help, this is driving me nuts!

[junkmalle]

Xvid sometimes gets stuck at a fixed bitrate. I think it happens if you switch to single pass quantization mode then back to 2 pass VBR. The only solution I've found so far is to uninstall the codec the reinstall it. I suspect there's a simple registry setting that could be fixed but I haven't yet found it.

[handtruck]

The thing is is that it doesn't do a fixed bitrate all the time... If I make the Target Bitrate lower, it actually works... Any ideas?

[junkmalle]

Uninstall and reinstall the codec.

[handtruck]

I've tried that and still no luck.

Here's the most recent example:

On a simple second pass (after the 1st pass was completed), I asked for the target size of the second pass to be 300000 KB (no audio).. The resulting size was 377434... This is driving me nuts! I usually ask for 300000 KB and I've had results as high as 575000.

Anything anyone can do would be nice... Could it be the avisynth script? It's the same one for the 1st and 2nd pass so I'm clueless at this point.

[junkmalle]

Try deleting the entire XVID section under HKEY_CURRENT_USER\Software\GNU in the Registry.

Make sure your vidoe.stats file is accessible.

[celtic_druid]

The installer should delete that key anyway, I know mine does.

How big is/would have been the first pass in each case? Larger or smaller than the set 2nd pass size?

[junkmalle]

The installer should delete that key anyway

I know that (it always deletes the key on my system and fixes the problem). I was guessing that something wasn't working right, he reinstalled without first uninstalling, or he "uninstalled" by using some other program which just unregistered the codec.

[celtic_druid]

My installer clears the key on install. Pretty sure that Koepi's does to, not sure about Nic's. Still pressing load defaults can't hurt.

[junkmalle]

My installer clears the key on install. Pretty sure that Koepi's does to, not sure about Nic's. Still pressing load defaults can't hurt.

Koepi's clears the key too -- I just checked.

[manono]

What quant ranges are you using? If you restrict them too much, you can get oversized. And if you have the minimum as quant 1, you should probably change that to 2.

[handtruck]

The registry key is definitely deleted on uninstall (I checked)

It's weird, even if I make a smaller target bitrate (700 instead of 1100), the file size is still bigger than it's supposed to be, but smaller than if I had put 1100.

video.pass is accessible and the same location for the first and second pass (The last modified date changes when I do a first pass).

[handtruck]

How do I change the quant range? Do you think this would help?

[junkmalle]

I know you said earlier that there is no audio but have you checked your output files to verify there really is no audio in them? It sounds very much like they do include audio, hence the larger size.