MPG to AVI file size problem

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MPG to AVI file size problem

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Leon399

Suspended due to non-functional email address

11. August 2003 @ 13:58

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Hoping I explain this right and maybe someone can offer a suggestion on what is wrong..if in fact anything is wrong.

I have a group of MPG video files that are about 450-500 megs in length, each about 42-50 minutes of video. What I do is take the MPG and convert it to a 350 meg Divx AVI file. This has worked fine for me on a number of the files. I convert, and my finished product is an avi file of 350 megs or close enough not to matter.

The problem, However, It seems that with a few of the MPG files, no matter what I do, or what I try, I can not encode to more then a 200 meg avi file. Maybe a little more then 200, or a little less depending on the file, but no where near what I encoded it to be. I an not a newbie at this, though not an expert by any means but I can't figure this one out. No matter what conversion program I use, no matter what bitrates I enter, I still get a 200 meg avi file. I even demuxed the MPG with Tmpgenc and tried the encode that way and still got the 200 meg file size. Would anyone know why this is happening? As I said, some of the MPG's convert fine so I can't figger it!
Any advice appreciated.

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afonic

Suspended permanently

13. August 2003 @ 05:37

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Hi!
Well actually in DivX you can choose the bitrate of the file. It is bigger bitrate = better quality, but also bigger bitrate = bigger file size. What you can do is to download a DivX Bitrate Calculator where you will put the movie length, the desired file size and it will tell you the bitrate you have to use. You can change the bitrate at the DivX settings (usually your program must have a Configure button or something). If you can't find a calculator I have one here: YOU WERE WARNED
Enjoy!

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This message has been edited since posting. Last time this message was edited on 14. August 2003 @ 07:23

powerdup

Senior Member

14. August 2003 @ 02:02

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Another reason is that the movie is saturated which means that the divx codec has used every bit that you allowed and has created a file at maximum quality which also means maximum filesize. So that means no matter what bitrate you use itll stay the same.
Some solutions:

Increase the resolution.

Disable B-frames if your using them.

If your using smoothing filters, try and add an extra sharpening filter into the mix otherwise get rid of the smoothing filter altogether.

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afterdawn.com > forums > archived forums > mpeg-1 and mpeg-2 encoding (avi to dvd) > mpg to avi file size problem


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