10bit Prospect HD seems to be 8bit only. at DVinfo.net

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Old October 9th, 2008, 07:06 AM   #1
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10bit Prospect HD seems to be 8bit only.

Hi.

I converted Sony EX1 clip .MP4 to CineForm Avi, using HDLink ProspectHD. Don't I suppose to get a 10bit Avi?? Why when I check the Cineform Avi file in windows file properties (that is select the file, right click, and choose properties), under Summary tab, it's still saying Video Sample Size 24bit? (or 8bit x 3 for RGB). Isn't it suppose to say 30bit?

I tried using After Effects, imported the Sony EX1 clip, then render out using Cineform Avi. Then I checked the windows file properties, it DOES say Video Sample Size 30bit.

So what is the correct workflow to edit 10bit (30bit RGB) in Premiere Pro CS3.

Thanks.
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Old October 9th, 2008, 09:50 AM   #2
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Desmond, this is a Windows Explorer problem with AVI files. Being as there is no universal manner to represent extended precision in AVI files, Windows Explorer *assumes* the files are 8 bits. Not to worry, *all* CineForm files created with Prospect HD and Prospect 4K are extended (10/12 bit) precision, regardless of what Windows Explorer reports.
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Old October 9th, 2008, 09:17 PM   #3
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Thanks for the reply David Taylor.

But why is the Cineform avi files created in After Effects read as 10bit (30bit in Windows File Properties). But created in HDLink read as 8bit. If it is a Windows Explorer problem, I would think windows will read them all as 8bit regardless.
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Old October 9th, 2008, 10:35 PM   #4
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It is actually meaningless information for a compressed file, any number can appear in that field, it has no bearing on the data within. 24-bit doesn't even doesn't sense for most sources, like the EX1's 4:2:0 in uncompressed averages 12-bit per pixel (8-bit Luma(Y) and 8-bit U/V every forth pixel.) Even uncompressed YUV 4:2:2 10-bit averages only 20-bit per pixel. We store a compressed precision up to 48 bits per pixel, yet the AVI header will still say something else.
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Old October 9th, 2008, 10:58 PM   #5
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Is there any other software to prove that Cineform AVI out of Prospect HD is always 10bit?
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Old October 10th, 2008, 10:15 AM   #6
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You are missing the point. A compression presentation has an internal precision that is independent of the file wrapper (AVI or MOV.) Under Premiere Pro, After Effects, FCP and many QuickTime application we are ask for deeper than 8-bit and we have the precision to decode to 10bit and beyond. It is the CineForm decoder that does this.
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Old October 10th, 2008, 10:32 AM   #7
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Quote:
Originally Posted by Desmond Sukotjo View Post
Is there any other software to prove that Cineform AVI out of Prospect HD is always 10bit?
Desmond, you can always do your own tests. Following is a Tech Note we published quite a while ago that demonstrates the difference between 8-bit and 10-bit precision. The technique we used to perform the tests should be easily reproducible by you. https://www.cineform.com/products/Te...ersus_8Bit.htm
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