Problem with target filesize in xvid

hi all,
been to this site alot lately and i like it alot, so no wonder that when i got stuck i came to ask for all your help ^_^.
first post so be patient ? here we go:

i can't seem to get the target size to work, i set it to 700MB (in kbs) and it gives me a 800+ file.
i reset the settings, installed the codec again (1.2.1, 1.2.1 patched and 1.22), even tries inside a virtualbox but nothing works.... any ideas ?
using avisynth as source for vdubmod, no audio track.
think thats enough info and if not ask.
please help.... im getting desperate and guessing different kbps numbers till i get the size i want and its 1337 annoying.

tnx.

You question is a bit confusing. What kind of file are you trying to convert to xvid?

Just a couple of ideas:
1. Is this a two pass variable bitrate encode you are trying? Single pass encoding rarely hits the mark for target size.
2. Have you tried using the bitrate caluculator in vdub, and also allowed for the size of your audio stream?

The bitrate calculator in AviDemux is the easiest of them all in my opinion.

sorry for the lack of data... here are some answers.

Quote:

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Originally Posted by lowellriggsiam

You question is a bit confusing. What kind of file are you trying to convert to xvid?

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its a avisynth output so vdubmod gets it as an RGB uncompressed avi i believe.

Quote:

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Originally Posted by midders

Just a couple of ideas:
1. Is this a two pass variable bitrate encode you are trying? Single pass encoding rarely hits the mark for target size.
2. Have you tried using the bitrate caluculator in vdub, and also allowed for the size of your audio stream?

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1.yes its a two pass encode.
2. yes ofcourse.

Quote:

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Originally Posted by hech54

The bitrate calculator in AviDemux is the easiest of them all in my opinion.

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i used the calculator that comes with xvid and i believe its quite accurate and takes into account overhead and all.

and on a general note (not to accuse anyone)... i wouldn't be asking unless i knew what i was doing and was really desperate ^_^

If you're asking for too much or too little compression Xvid will often miss the mark. Make sure your min and max quantizers are reasonable: min 2 (or 1), max 31.

Quote:

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Originally Posted by legion0

used the calculator that comes with xvid and i believe its quite accurate and takes into account overhead and all.

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Now try the one in AviDemux.
:D

Quote:

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Originally Posted by jagabo

If you're asking for too much or too little compression Xvid will often miss the mark. Make sure your min and max quantizers are reasonable: min 2 (or 1), max 31.

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i am trying to compress 42 minutes of video to a 700mb file, the calculator gives around 2000kbps which isn't too high or too little :(
EDIT: quants are good, they are defaulted to 2-31

Quote:

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Originally Posted by hech54

Quote:

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Originally Posted by legion0

used the calculator that comes with xvid and i believe its quite accurate and takes into account overhead and all.

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Now try the one in AviDemux.
:D

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just did, gave same results :(

i just did 2 encodes,
1. 42:20 long, i entered 1981kbps as desired bitrate and the result was 2175kbps
2. 41:33 long, i entered 1816kbps as desired bitrate and the result was 2175kbps

what the hell is going on ???
btw 2175 is what i needed so it will fit in 700mb.

as each encode only takes me ~15 mins i dont mind going through 2-3 attempts till i gess the right number, but its a pain in the ass.

What is the resolution of your output ? I've seen this problem before on my own box,
but at the moment, I can't remember what I did to fix it!

Quote:

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Originally Posted by davexnet

What is the resolution of your output ? I've seen this problem before on my own box,
but at the moment, I can't remember what I did to fix it!

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720x400

Perhaps you installed a newer XviD without first uninstalling an older one. This can easily lead to incorrect sizings. My suggestion is to uninstall your XviD codec via Add/Remove programs and then install it again.

Quote:

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Originally Posted by manono

Perhaps you installed a newer XviD without first uninstalling an older one. This can easily lead to incorrect sizings. My suggestion is to uninstall your XviD codec via Add/Remove programs and then install it again.

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uninstalled xvid, all ripping/converting programs and codec pack, restart,
installed codecpack without xvid, then xvid 1.21 patched, then avisynth and vdubmod.

did this twice and still nothing.

I suspect some kind of corruption also. I have had problems like this in the past.
I've got a dual boot XP, on one system it works perfectly, and on the other it hangs at 99% encoded and I have
to kill it. I may try and investigate tomorrow.

On the working system, I did a test encode, 30 minutes of video. I multiplied 480MB (my target) by 1.024
and put that in the xvid calculator - came to 491520. Gave me a bit rate of 2104 (with 128 kbps CBR audio)

The finished file was within 1MB of 480MB. I tried the Divx calculator also, give me a bitrate of 2096, slightly more
conservative.

Never mind - my numbers didn't fit.

Try re-installing XVID, and disable the A/V during the operation.
Set the codec to defaults.
On the xvid config screen, 2nd "more" button from the top, set the location of the stats
file to desktop. Run the first pass.
On the 2nd pass, use the xvid calculator, enter 716800 for the size (700MB),
and enter your running time and audio bitrate as necessary.
Run the 2nd pass.

tried this too :( this is soooo frustrating :(

Try unchecking "packed bitstream" and see if it affects anything.

Quote:

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Originally Posted by davexnet

Try unchecking "packed bitstream" and see if it affects anything.

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interesting... will try

Open VDubMod and go Video->Compression->XviD MPEG-4 Codec->About and make sure you're using the included one. If not, uninstall what you have via Add/Remove Programs and get it back. You said you've tried several, but not which you're using at the moment. It should look like this: