Only 8 minutes on 4 GB P2 card for DVCPRO50??!!

O

Overlook

Active member
I get 10 mins per 4GB P2 card recording 720 24PN. Why does the camera tell me that I can only get 8 minutes of 480i 24 P on same card?
 
For the best explanation, see

For the best explanation, see

Barry's "HVX Book" pages 33 thru 38, particularly the bottom of page 36. In simple terms, native mode does not "waste" space by storing duplicate frames, so you have more room for storage.

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DVCPRO50 = 50 megabits per second.

720/24pN = 100 megabits per second * (24/60) = 40 megabits per second actual use.

DVCPRO-HD 720p is twice as compressed as DVCPRO50.

Look at it this way: DVCPRO50 30p = 8 minutes per card. 720/30pN = 8 minutes per card. 720p has twice as many pixels, twice as compressed, so it nets out taking up the same amount of space.

24PN has 20% fewer frames than 30pN, so it takes up less space.
 
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