Why do most AVI's and WMV's seem to not work on the PS3?

[ctalkeb]

Vashyo said:
I use Java ps3 media server to stream video to my ps3.

Though I have to disconnect from the internet otherwise the video lag will make it unwatchable.

Disconnect your computer? Or the PS3? I only get lag when trying to watch 1080p material with subtitles.