ivtv, mythtv, pvr-350

iIt is not possible to fast-forward at more than 3x or rewind without a picture freeze with the ivtv driver + tv-out checked in mythtv (this option allows to decode with the pvr-350, so that the CPU runs near 0%). Uncheck this option to fast-forward and rewind normally at all speed (sticky keys needs to be checked in mythtv).