After waiting a couple hours for an .avi file of mine to convert to mpeg-4 using PSP Video 9, I placed the mpeg-4 file in the VIDEO folder on my mem stick. The thumbnail is there on the XMB, it starts for half a second and then says "This video cannot be played."
I searched google and it seems its pretty common, but all of the guides make references to older CFWs such as 3.03 and 3.30. I was thinking perhaps its the 3.71 CFW thats causing the trouble? Has anybody got this working?