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Minimum drive speed for DPX or Uncompressed 10bit

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Will Fleisher
Minimum drive speed for DPX or Uncompressed 10bit
on Dec 19, 2010 at 11:09:18 pm

Just a quick question regarding drive speed.

We are getting DPX files for our online.

What is the minimum drive speed required for this?

We have a MacPro 8-Core w/ 8 GB RAM

We need better than esata, right? At least a RAID setup?


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Michael Gissing
Re: Minimum drive speed for DPX or Uncompressed 10bit
on Dec 20, 2010 at 12:38:15 am

What frame rate and pixel size?

The free AJA data rate calulator gives you info on file size and data rates required for lots of different formats. Knowing the data rate required, you can also use disk speed test utils from Blackmagic or AJA.
http://www.aja.com/products/software/


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Will Fleisher
Re: Minimum drive speed for DPX or Uncompressed 10bit
on Dec 20, 2010 at 1:02:09 am

It's 24 fps at 2K


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Bouke Vahl
Re: Minimum drive speed for DPX or Uncompressed 10bit
on Dec 20, 2010 at 10:02:37 am

I don't get it.
If you are an online shop that works with DPX, how come you don't know this?

I have a feeling you will encounter a few other things as well.

But, the math is simple.
file size per frame * fps * 1.2 (little room to spare) per stream you want to play back.
That means for 30 fps 2k about 324 mB (note the capital B) per second.


It is not uncommon NOT to be able to playback in RT, but use them just to conform, while rendering to another codec for preview.

Bouke

http://www.videotoolshed.com/
smart tools for video pros


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gary adcock
Re: Minimum drive speed for DPX or Uncompressed 10bit
on Dec 20, 2010 at 3:28:58 pm

[Will Fleisher] "We are getting DPX files for our online.
What is the minimum drive speed required for this?"



You will not be able to handle DPX frames over esata.
2K-DPX frames are 12+ MB per frame so 300+ MBps is required to handle realtime playback.

gary adcock
Studio37

Post and Production Workflow Consultant
Production and Post Stereographer
Chicago, IL

http://blogs.creativecow.net/24640



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