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I should have paid attention in math class.

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Scott Davis
I should have paid attention in math class.
on Feb 14, 2012 at 4:53:35 pm

We are shooting on the Nano Flash using XDCAM at 100Mbps. What is our per hour data usage?

Scott Davis
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Job ter Burg
Re: I should have paid attention in math class.
on Feb 14, 2012 at 5:18:31 pm

At what frame rate? 1080 would 48GB/hour, according to the Estimated Storage Requirements in the Avid manual (AVC-Intra 100).


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Scott Davis
Re: I should have paid attention in math class.
on Feb 14, 2012 at 6:12:24 pm

1080/59.94

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Bouke Vahl
Re: I should have paid attention in math class.
on Feb 15, 2012 at 9:39:57 am

What has framerate to do with it?
100 Mbits / sec is 100 / 8 = 12.5 MegaByte per second.
12.5 MB * 60 seconds = 750 MB per minute.
750 MB per minute makes 750 * 60 minutes = 45000 MB per hour.
45000 / 1024 = 44 GB/hour (excluding sound, as the datarate is normally specified for video only.)
Add about 400 Mbyte per channel per hour...

Bouke

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Job ter Burg
Re: I should have paid attention in math class.
on Feb 15, 2012 at 11:50:27 am

You are of course correct, Bouke.


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Chris Conlee
Re: I should have paid attention in math class.
on Feb 15, 2012 at 10:36:22 pm

In Job's defense ;-) the Panny HVX200 says it shoots DVCPRO 100, which leads to the above-referenced formula, but if shooting the same codec at 23.976 720P native, you're actually only using 80% of the datarate in the same amount of time. So yes, if the datarate is a locked 100Mb/s then the formula holds and framerate has nothing to do with it. However, if that's the stated codec bandwidth, but you're running at a different framerate that number could change depending on manufacturer, etc.

Chris


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Job ter Burg
Re: I should have paid attention in math class.
on Feb 20, 2012 at 10:25:55 pm

And the same goes for DNxHD36, which is 36 @23.976 and @24, but actually '40' @25fps and '45' @29.97, yet is mostly labeled '36' inside MC.


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