Would like a pass for an m3u source that is time delayed about 4 minutes. Optimally Start recording 4 minutes late, end recording 4 minutes late. I thought I had it set up in the server, but the AppleTV app shows as starting 3 minutes early, not 3 minutes late. I say 3 minutes because there is no 4 minute option, which is also an issue. Thanks
You should just be able to edit the start and stop times of the pass. I've never tried to edit or even view this info outside of the web interface so I don't have any idea on how it looks on ATV.
Some good info in the Advanced Passes section Advanced Passes - Channels Community
Creating or Editing an Advanced Pass on the DVR allows you to enter Custom padding in seconds.
Negative Start padding starts it late.
Negative End padding ends it early.
Advanced Passes Padding - #2 by chDVRuser