Video Assist Frame Rate and Canon HF G30

Hope someone can help.

I've just purchased a BMVA and connected it to my Canon HF G30. The BMVA records the signal, trigger starts and stops the camera, and all is good. Except: The BMVA defaults to 59.94 as soon as I turn on the camera. The camera itself is set to 23.98p, so I'm not sure what's happening. Has anyone had this happen? And if so, is there a solution?

Thanks in advance -

Paul

Paul, it is your camera, which is outputting a 1080i59.94 signslmehen you sent the camera to 1080p24. The camera is converting the video,signal to an interlace signal via 3:2 pulldown to get a lower bandwidth 1080i59.94 output, which supports current broadcast and switcher requirements. The VA does not up/down or cross convert the received video signal, except on SDI when it gets a 1080 PSF signal, which it can convert back to 1080p24.
Cheers

Denny

Thanks for the quick reply and explanation. Does this mean that the VA is indeed recording at 59.94?

Paul

It means when the VA detects a 1080i59.94 (interlace signal) it will record the signal as a 1080i59.94 interlace signal. You can remove the 3:2 pulldown in your NLE and return the footage to 1080p24, but the VA will not do this automatically as some other recorder/monitors will do.

Interlace is a two field signal, and two fields equal one frame on a progressive signal. So your 1080p24 signal is split into two fields for each frame, resulting in twice as many fliers, giving a 95.94 fields per second frame rate, which is not a true frame rate (it takes two interlace frames to get in progressive frame) so you still have a net frame rate of 24 frames per second
Cheers