I'm having ipod touch 4g. I've downloaded the player xtreme HD app from itune. xtreme player adding and playing only the recorded video. It hasn't added the synced movies.
iOS: Troubleshooting applications purchased from the App Store
Contact the developer/go to their support site if only one app.
Restore from backup. See:
iOS: How to back up
Restore to factory settings/new iPod
Retrieving data ...