Vista's Windows Movie Maker does not come with a bitrate setting I needed for encoding small 320 x 240. Sometimes I could use the "Compress to:" setting and change the number to around 8-10 mb and the video size would change to 320 x 240 with a bitrate of around 330 - 440 kbps. That is an ideal spec for my web project. I was doing that for awhile but recently came to some videos which I could not use the "Compress to:" setting because at 320 x 240, the bitrate was 1003 kbps taking up 23 mb. I noticed the change when I was doing the encoding on the new fast computer I built. So Windows Movie Maker's "Custom setting:" is based on how fast or slow your computer is. Vs the old computer, which I still use, the new fast computer with overclocked Q6600, Windows Movie Maker's "Custom setting:" provided bitrate over 2x. It seems to think it's fast enough to play and encode at that bitrate for 320 x 240. I could not use that for my web project.
So I did some researching and found an article at Microsoft.com. It tells you how to make a custom movie maker profile setting for use with Windows Movie Maker. I followed the instructions in the article and it didn't work at first. The instruction they gave were wrong. The steps said to save the custom profile you make under Documents folder, I did that and WMM would not show my custom setting. I read more about this custom creation at another site and found that you have to create a folder called "Profile" under C:\Program Files\Movie Maker\Shared. That's right, you gotta create the folder yourself, it isn't there already. I did this and it worked. After finding this out, I went back to the Microsoft article, and submitted the correct information to them via at the bottom of the article "Was this helpful?". And guess what, they updated their instructions!
Basic steps to creating your own custom setting for WMM.
1. Download and install Windows Media Encoder 9 Series from the Microsoft website.
2. Open Windows Media Profile Editor
3. Enter a name like "384 kbps", enter description, check Audio and Video, select CBR or Quality VBR for both, add a target bitrate, then edit your video and audio options
4. Save and close, save to C:\Program Files\Movie Maker\Shared\Profiles (create Profiles folder)
5. Load Windows Movie Maker and to encode your videos with the custom setting, go to Publish Movie, and at the settings, Select More settings and select your profile (the name you entered in Windows Media Profile Editor)