PSP MPEG-4 Video Renaming, Copying, and other stuff utility released (PSPUpdates)
Simple PSP Copy
Do you have alot of AVC encoded MP4's? Are they named improperly for play on the PSP? Well, maybe you don't but
Berklee did. To ease his suffering he's created a simple renaming tool for your videos and emailed us about it:

I had a very simple problem that needed a very simple solution. I had a
number of AVC-encoded video files that I wanted to copy to my PSP. But
I simply kept forgetting to rename the video files after copying them,
so there was no way I could play them back.
Simple PSP
Copy helps with the renaming. It can copy multiple AVC video files to
your PSP and automatically rename them for you. Just unzip the files
and double click SimplePSPCopy.exe.
If it doesn't work, you could try to install these Visual Basic Runtime files from Microsoft first. That should fix it.
You can download this file from PSP Updates' new QuickJump Download site [here].