GoPro Hero 3 Black edition HDMI 2 SDI
 

Hi for the information of others I have been able to establish that the GoPro Hero 3 Black edition creates problems when converting the HDMI signal to SDI. This applies to Blackmagic or Atomos Connect Converter S2H - SDI to HDMI converters. I have made GoPro aware of the problem and advised that the issue will be addressed in the next firmware update.