XDCam HD422 to prores confusion

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10 points

XDCam HD422 to prores confusion

I'm editing a project shot on a Sony F3, outputting to a Nanoflash at 180mbs.

When I brought it into FCP to check the details in the browser the codec was "XDCAM HD422 1080p25 (50 Mb/s). This is the first time I've cut with footage shot in this codec, and my plan was to convert to Prores as usual.

What I'm confused about is a; why does the browser say the XDCAM footage is 50 Mb/s when it was shot at 180 MB/s and b; when I do convert the footage to Prores, the resulting file is only 2/3rd the size of the original HDCAM file. Shouldn't it be bigger?

I'm holding off going any further on the project to I can be sure I have the correct workflow.

Any help appreciated.

cheers

hugh

MacBook Pro, Mac OS X (10.7.4), 2.4 GHz, 8 gig Ram, Final Cut 7.0.3

Posted on Aug 21, 2012 2:33 AM

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Answer 1

Hughey Author

Level 1

10 points

Aug 22, 2012 4:20 AM in response to Hughey

I got a reply over here, posting in case people come across this while searching for the same problem.

http://forums.creativecow.net/thread/8/1163677#1163677

cheers

Hugh

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Answer 2

Aug 21, 2012 4:31 AM in response to Hughey

I think this is a mega bytes per sec MB/s v Mega bits per sec Mb/s. 1 mega byte = 8 mega bits.

DM

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Answer 3

Hughey Author

Level 1

10 points

Aug 21, 2012 3:07 PM in response to David Mclaine

Hi David, thanks for your suggestion.

I'm almsot certain that's not the case in this instance, as the information in the browser for other codecs/calculations matches up usualy. Also a 1:8 ratio doesn't reflect the difference I'm experiencing, which is closer to 1:3.2.

Cheers

Hugh

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