no- delays on blackmagic are from a totally different source-
blackmagic buffers frames when the computer is doing something else- especially when playing back a large movie at the same time....
and it can buffer up to more than 1/2 second. especially with hdsdi and playing lots of movies or a big movie.
this is totally out of my control- and variable - it changes - i have seen up to 2 seconds of buffering- which is good for video capture to disc- but not so good for doing live input.
thats because its designed to capture video onto disc with no frame drops- and the time delays through the buffer are not important for their normal users.
Latency is not a design problem for video capture to disc.
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LFG and phoenix cards dont buffer like this-
delay is constant - and is done by me and graphics card-