I'll try it when I get back to the studio! GoPro have been quite unresponsive - Blackmagic got back to me with this:
On 29 Aug 2012, at 10:35, Blackmagic Support EMEA wrote:
I did recently contact GoPro for some more information about the output of their cameras, and this is the response I received:
Thank you for contacting us here at GoPro. We unfortunately do not have much detail on HDMI connection or EDID. What we can provide is the information on our support page which is below. If you need more detail than that I can try and get in contact with our engineering team for a more detailed breakdown.
When you connect your HD HERO2 to an external monitor with an HDMI cable, your camera should automatically go into live-feed mode. This means that the monitor will display what the camera's image sensor sees. If your monitor is not displaying the signal, it may not be compatible with the HD HERO2 camera's HDMI output. Here is a list of the HDMI output settings for the HD HERO2 camera:
NTSC HDMI output settings:
WVGA 60fps output: 480p 60fps
WVGA 120fps output: 480p 60fps
720p 30fps output: 720p 60fps
720p 60fps output: 720p 60fps
960p 30fps output: 1080p 30fps
960p 48fps output: 1080p 30fps
1080p 30fps: 1080p 30fps
Setup menu, Photo/video preview outputs: 1080p 30fps
PAL HDMI output settings:
WVGA 50fps output: 480p 50fps
WVGA 100fps output: 480p 50fps
720p 25fps output: 720p 50fps
720p 50fps output: 720p 50fps
960p 25fps output: 1080p 25fps
960p 50fps output: 1080p 25fps
1080p 25fps: 1080p 25fps
Setup menu, Photo/video preview outputs: 1080p 25fps
If your monitor does not support 1080p, the camera will output 1080i 60fps (NTSC) or 1080i 50fps (PAL). If 1080i60 is not supported, the camera will revert to outputting 720p 60fps (NTSC) or 720p 50fps (PAL).
Please let us know if you have any other questions and have a great rest of your day!"
Please keep in mind that only the broadcast resolutions such as PAL NTSC 720 and 1080 are supported by Blackmagic devices.
GoPro are eager but unable to explain why their HDMI streams are non-standard. Very frustrating.