I used Media Go, and did some of the tricks to get an unsupported video files to work on my PSP.
This is all my steps that I did, when I first got my unsupported video files to work on my PSP. It works 100% with all my video files onto my PSP Portable
Things you will need:
*Media Go Download*
*Keep Vid for downloading Youtube URL Videos*
Step 1: Find videos you like on Youtube
Go to Youtube, and find your favorite videos you like. Then hit right-click on your mouse, and copy the Youtube URL
Step 2: Downloading your favorite Youtube videos
Go to www.keepvid.com
Then hit right-click on your mouse, and paste your Youtube URL codes in your Keep Vid URL box, then hit Download button.
Step 3: Downloading Media Go
Step 5: Drag and Drop your video files
Your video files will show up unsupported data on your PSP portable.
Step 6: Using Media Go with downloaded video
What you want to do next is open Media Go. Right-click on video files on your PSP, and hit transfer to Library. Then delete the video files on your PSP.