[mythtv] AddInheritence errors in mythfrontend log

[David Shay]

Just started getting these errors in the log file for mythfrontend:

AddInheritance(A         ) Error, future=frame

They range from A to H, at first in letter order, then seemingly randomly.

I am using an Epia M10000 with XvMCVLD for the Via CLE266 on files recorded
from a PVR-250.  Seems to be creating more pre-buffering pauses as well.
I'm aware there've been a ton of done work around this, but let me know if I
can help with providing more info to debug.