an additional step between decoding and encoding:
@example
- _________ __________ ______________
-| | simple | | | |
-| decoded | fltrgrph | filtered | encoder | encoded data |
-| frames | ----------> | frames | ---------> | packets |
-|_________| |__________| |______________|
+ _________ ______________
+| | | |
+| decoded | | encoded data |
+| frames |\ _ | packets |
+|_________| \ /||______________|
+ \ __________ /
+ simple _\|| | / encoder
+ filtergraph | filtered |/
+ | frames |
+ |__________|
@end example