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September 30th, 2009, 11:29 AM
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#1 |
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New Boot
Join Date: Sep 2009
Location: London UK
Posts: 11
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What bitrate
Hi
According to Canon the top bitrate is 330MB/MIN. Using plain maths I make it that top rate is 330MB/60SEC=5.5MB/SEC. How does this compare with Mimi DV 24Mb/SEC or HDV 25MB/sec. AM I WRONG????? DAVID |
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September 30th, 2009, 11:42 AM
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#2 |
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Major Player
Join Date: Dec 2008
Location: Woburn, MA
Posts: 205
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I always get confused with Mbits; I work better with X min = Y GB.
Given that 12 minutes of video equals approx 4GB of video, then 1 hour of video is about 20GB. But one hour of DV or HDV is approx 13GB. So from those calculations, the transfer rate of the 7D must be almost twice as fast as that of DV/HDV I think ;) |
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September 30th, 2009, 01:48 PM
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#3 |
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New Boot
Join Date: Sep 2009
Location: London UK
Posts: 11
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not sure
According to your suggestion i would calculate 330x60=19.8gig
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September 30th, 2009, 04:18 PM
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#4 | |
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Major Player
Join Date: Feb 2006
Location: Philadelphia
Posts: 795
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Quote:
5.5MB (megabytes)/second = 44Mb (megabits)/second MiniDV and HDV are both 25Mb (megabits)/s, so roughly 3.2MB (megabytes)/s So the proper comparison is: 7D at 5.5MB/s vs. DV/HDV at 3.2MB/s or 7D 44MB/s vs. DV/HDV at 25Mb/s So whichever way you look at it the 7D runs over 70% more data per second than DV/HDV. It also uses a newer, more efficient codec, although that doesn't necessarily mean much because there is a lot of variation in real time hardware encoding performance.
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October 2nd, 2009, 01:31 PM
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#5 |
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New Boot
Join Date: Sep 2009
Location: London UK
Posts: 11
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right to the point or pixel
EVan thanks for clearing up the confusion. The quality looked too good for 5mb/s now I know why.
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October 4th, 2009, 08:41 PM
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#6 |
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Major Player
Join Date: Sep 2007
Location: Tokyo
Posts: 230
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I looked at the bitrate graph on a file in Premiere and it seems that it is variable bitrate. A good portion of the video I took was floating around 3.5MB/s
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