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DVC Pro HD codec question
Hi,
As I understand it. The DVC Pro HD codec is 100mbs. And you use all of this if you are shooting 60fps with the Varicam. Is it true that if you are shooting 24fps you are only using around 50mbs of the codec and if you shoot 4fps you are only using around 6mbs?
If this is correct does it matter? Also if this is right then 25fps (720p HD)uses approx 50mbs while 50i (SD)shot with the dvcpro 50 codec also uses about the same bandwidth?
Is the above right? If so is the DVCPROHD codec so good that it gets by doing more with less bandwidth.
I am new to the Varicam and all of the above so please excuse if this is a dumb question.
Thanks
George Evatt
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2 Replies
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Hello. Dvcpro50 is compressed at 3.3:1 and Dvcpro100 at 6.7:1
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[George Evatt] “Is the above right? If so is the DVCPROHD codec so good that it gets by doing more with less bandwidth.”
George,
I think it’s more the compromise that we make with the Varicam to be able to shoot variable frame rates up to 60fps progressive and still capture and edit the HD original data on a firewire drive.
It would be cool, and a big improvement, if the camera would use all 100mb/s when shooting at 24 or 30 fps (as I think the Sony HDcam does), but it doesn’t and fills the extra space with duplicate frames as slugs.
Fortunately, the compression is often not visible to the average viewer.
But now you’ve led me to a crazy idea: Could we shoot at 48fps and have a Final Cut Pro plug in that uses all the frames and blends them into 24fps? Or at least, uses the extra frames to create a 30fps for dvd or tv broadcast without the interlaced frame added during the conversion from 24p to 60i?
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