As a test for a video encoding device, I am taking a news feed off of a Dish Network satellite dish decoder, RCA out to my video encoder.
Everything looks fine except occasionally when the news switches over to a remote reporter in the field.
Watching on TV, the picture looks fine.
Watching the product of the encoder - it goes pixelized and degrades as though a snowstorm just blew over my dish.
How could there be any signal difference at all between the studio and the remote reporter after those signals have been combined, uplinked, downconverted and translated to RCA (Video, Left ,Right)?
Shouldn't the signal be completely homogeneous by the point it comes out of a Consumer Grade Dish Network decoder?  I can't figure out what my encoder is struggling with that my TV would not.

Adder: I just viewed the effect again, only with a cut-away to a commercial. The effect does not carry through transitions, it clears immediately at the next commerical or other on screen change..