Having two front cameras seems to lead to use one to get a cropped picture of the speaker for lecture composite and the other one for a full screen or sbs picture (uncropped).
This leads to a 3-source-transition lec(A,B) ↔ fs(C) that can not be solved by the current implementation.
As a possible solution there shall be a generic fading transition from c1(A,B) ↔ c2(C,D).
Having two front cameras seems to lead to use one to get a cropped picture of the speaker for lecture composite and the other one for a full screen or sbs picture (uncropped).
This leads to a 3-source-transition
lec(A,B)
↔fs(C)
that can not be solved by the current implementation.As a possible solution there shall be a generic fading transition from
c1(A,B)
↔c2(C,D)
.See transitions documentation for further explanation.