Hey wait a minute hold the phone!
I did everything that's indicated, but my damn program (PSP VIDEO 9) doesn't convert my MP4 videos, heres the deal:
I did every step to "transscode new video", selected my profile and start transcoding, but GOD knows why, when I tried to copy it to my psp, there's no video transcoded in "MY PC" box! It does not appear! And I've checked my destination folder, and it matches with the "my pc" copy box! what did I did wrong???

Please! Any help will be regarded!!!
