I put a Test Bar (QT prores HD) in COLOR. Ultrascope via HDMI has the same levels than the scope of color (White 700mv, black 0) but via SDI it's different on the ultrascope (White 800mv, black about -10mv)...
More strange, with a R3D no differences between the HDMI output and the SDI output.
I have a decklink HD Extrem 3 to output the signal. In my opinion, the problem comes from the decklink Extrem... Perhaps. What do you think of that ?
thank's. I used a HDMI -> SDI converter. To compare HDMI and SDI output from Blackmagic. And it's different when I import in apple Color a QT Uncompresded. Via HDMI it's similar to the scope in Apple Color, but via SDI it's different.