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Re: Cineframe 30/Cineframe 25 resolution loss vs. 60i

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Re: Cineframe 30/Cineframe 25 resolution loss vs. 60i
by simkiss on Jan 7, 2005 at 4:31:38 pm

Cameras in reference: Sony HDR-FX1 and HVR-Z1U

QUESTION GROUP 1:
If you film at 60i, your datastream is 25 Mbps on the Z1/FX1. Likewise, if you film at 50i (Z1 only), the datastream is still 25 Mbps, isn't it?

Since HD resolution for 50i/25p and 60i/30p is the same...

(unlike NTSC's 525 lines @ 29.97fps vs. PAL's 625 lines @ 25fps for example making the datastream bandwidth equivalent between the two...both 50i and 60i record at 1440x1080 and both output 1920x1080i)

...doesn't that mean that at 50i there is 20% less compression of the video since there are 20% fewer frames at the same resolution??


QUESTION GROUP 2:
I will use the Z1 to record for blow-up to film. Has anyone seen this done yet (with an FX1 since the Z1's not out yet)?
Since my output will eventually be 24fps, taking into account question group 1 above, should I record in 60i or 50i? I saw the resolution loss for CineFrame 24/25/30 with the links above--pretty bad. I guess I'm using software-based conversion from i to p. Who's the best without requiring indentured servitude to pay for it?

thanx


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