All, The DSS2 code base seems to inadvertently prevent downscaling of video overlay frames. Attached is my attempt at a patch to resolve this issue. As I gather from the code, there is an attempt to limit the overlay output frame size (x, y, outw, outh) to the managers updated window (mc->x, mc->y, mc->w, mc->h). The problem is that the input frame size (w & h) is being used to instead of the output frame size (outw, outh). Due to this, when the input frame size is large than the output frame size, the input frame is being cropped, thus no downscaling occurs. My patch corrects this issue and also attempts to properly scale the input frame size if indeed the output frame is cropped. In my particular case, the output frame size is never cropped, so I have not explicitly tested these equations, but I believe they are mathematically correct. With this patch overlay downscaling is functional. Steve.
0001-Proper-Scaling-Fix.patch
Description: 0001-Proper-Scaling-Fix.patch
