set start and end playback of recorded TV shows?

with programming changes often a show starts or finishes late or early. To ensure it records all of the show we need to set the DVR settings to start and finish recording a minute or two early / late. This is kinda standard for things like media centre, and other DVR solutions.

However, this means if I want to keep videos in my plex library they constantly have excess adverts or other programs at the start or end.

Is it possible to set the start time of a video playback… end would also be good, but not as useful.