PS VITA / PsTV need help to find homebrwe or solutions for music and videos play back !

[zieg]

unlike psp , ps vita don't have sleeptimer feature to turn off your music , i'm looking for homebrew or plugin that can turn off task or power when the time's up ! secondly , about videos playback , is there any solution to play videos while turn off screen? apreciate your help ! thanks you for reading !