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afterdawn.com > forums > archived forums > divx / xvid > xvid bitrate/filesize problems
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xvid bitrate/filesize problems
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aaron23
Junior Member
_ 		13. October 2005 @ 15:03 _ Link to this message    Send private message to this user   
Hey there,

I have been using your Xvid guide "Xvid with Ac3 surround sound" to create my dvd movie rips. i have be doing this for ages and encodes heaps of movies, they all came out sweet. i got a new motherboard and reinstalled windows + encoding tools, when i try and encode movies, i now cant get the destined filesizes (i usually encode 700mb) and i have also noticed that the bitrates are larger than my input bitrate i enter into the Xvid codec (i have tried several times and ended up with the same results).

any help would be great.

thanks Aaron
[ + quote]
celtic_d
AfterDawn Addict
_ 		13. October 2005 @ 19:19 _ Link to this message    Send private message to this user   
Are you doing a 2 pass encode and setting the 2nd pass to larger than the first? This can result in oversized output as the default settings result in too many I frames. Personally I wouldn't recommend making a 2nd pass larger than the first anyway.

What exactly are your steps/setttings though and what build/version of XviD?
[ + quote]
aaron23
Junior Member
_ 		16. October 2005 @ 00:58 _ Link to this message    Send private message to this user   
i am doing 2 passes, i use the following XviD codec:

XviD MPEG4 video codec

12:53:36, Jun 6 2004

xvidcore.dll version 1.0.0 ("xvid-1.0.0")

(Koepi's 1.0.1 CVS Build)

there is no bitrate specified in the 1st pass, i can only enter a bitrate in the 2nd pass.

i follow that XviD guide on afterdawn.com's website. I open the video > crop/resize/deinterlace etc > i select "first pass 2 pass" (dont do anything else) > save job > i select "second pass 2 pass" use the bitrate calculator to determine bitrate and copy it to bitrate section in XviD codec > save job > then i run job control.

i dont understand what is going on i formatted my comp and started fresh and i am still getting 850Mb files when i select the output file bitrate as 700MB.

thanks aaron
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celtic_d
AfterDawn Addict
_ 		16. October 2005 @ 05:02 _ Link to this message    Send private message to this user   
I am aware that you can't enter a bitrate for the first pass. It is encoded at a constant quantizer or 2.

I'd suggest updating XviD. If you wait a little longer there should be a new official release out though.

If you didn't discard the first pass, have a look at it and see how big it is. Otherwise look at the stats file generated and see how big the first pass would have been.

What are your quant settings though? If you have them capped to 2->31 or basically anything that doesn't allow 1, then your problem isn't because your 2nd pass is larger than the first since that only effects encodes where quant 1 is enabled.
[ + quote]
Related links
Download XviD codec from here.
 
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