Playback timing wrong on PVR350

Since 0.19, I (and several others) have noticed that timing is broken during playback on the PVR350. It may only affect people in PAL-land.

• Jumping forwards takes you backwards
• Returning to a bookmark positions you before the bookmark
• Shows continue playing beyond the length of the show as displayed by the OSD

The time distortion gets progressively worse as playback continues. Jumping or returning to a bookmark resets the distortion back to zero. There is a trac ticket about this bug here.