Hi here are a few images to help:
First the resolution setup:
This is what the preview look like, Isadoras NDI is on the right, my c++ NDI is on the left, both are 150*5 resolutions:
When I use the Isadora stream and scale it up I get these jagged edges (the black bars on the right of the stream and also the stream is rotated 90°:
My 150 * 5 stream under the same scaling (it does miss the bottom row of pixels, but I guess NDI wants only even numbers of rows and columns:
I guess this does not happen at all scales, but for these small streams Isadora does not seem to output NDI correctly.
Fred