就我所知，那應該是5.0.4版的Bug(你用的是這版吧？)
更新到5.0.5看看∼

DivX Version 5.0.5 (http://www.divx.com/divx/)
released 2003-04-24

**Fixed:
A bug that would cause the codec to encode every frame as an I-Frame when used with certain applications (e.g., AVIUtil, DVD2AVI, and some video capture applications).

贊助商連結

原來真是DivX 5.04版本作怪，轉用DivX 5.05 之後就解決了，謝謝你的回覆！