I should have paid attention in math class.

[Job Ter burg]

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

[Scott Davis]

1080/59.94

Scott Davis

[Bouke Vahl]

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]

You are of course correct, Bouke.

[Chris Conlee]

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

[Job Ter burg]

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.