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ProRes, File Formats and Sizes upon Capture (using Canon HV-20)

I've only just got my first HD (technically HDV) camera. I'm trying to wrap my head around the file sizes and formats.
When I import the clips from the camera (Canon HV-20) to iMovie or Final Cut, I get totally different file size. For instance, the same 5-second clip brought into iMovie because 38 MB compared to 18 MB when brought into Final Cut.
If I click on the file info, the clip after being imported into Final Cut is:
1440 X 1080 HDV 1080i60, Integer (Little Endian), Timecode

I heard that ProRes was an ideal format for keeping HD clips in, because of its small file sizes. But if I export this 5-second clip in an HQ ProRes format, then it ends up as 109 MB.

Put in the form of a question -- what I want to do is capture as much video as possible (preferably hours upon hours), which I store on a Hard Drive -- naturally, I need to minimize file sizes -- what do you think my best work-flow is to do this?

imac 2.4 GHz, 24" monitor, Mac OS X (10.4.10), also use powerbook 12 inch

Posted on Nov 28, 2007 8:59 PM

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Posted on Nov 29, 2007 5:26 AM

iMovie is transcoding the material into AIC (Apple intermediate codec) which gives the file a continuous I frame structure at some loss of quality and increased data rate.

FCP is likely keeping the material in the original long frame GOP structure which will be as small as the file will be without down grading the resolution.

Compared to the data rates of uncompressed HD 10 bit 1080i (~250MB/s) ProRes has a LOT smaller data rate.

The advantage of converting to ProRes from HDV is increased color space (expanded to 4:2:2) and an all I frame format. The downside, as you have discovered, is a larger file size.

In summary, the smallest file size you can capture without screwing up the image is the format of the original recording - ie HDV.

x
5 replies
Question marked as Best reply

Nov 29, 2007 5:26 AM in response to Soul Forest

iMovie is transcoding the material into AIC (Apple intermediate codec) which gives the file a continuous I frame structure at some loss of quality and increased data rate.

FCP is likely keeping the material in the original long frame GOP structure which will be as small as the file will be without down grading the resolution.

Compared to the data rates of uncompressed HD 10 bit 1080i (~250MB/s) ProRes has a LOT smaller data rate.

The advantage of converting to ProRes from HDV is increased color space (expanded to 4:2:2) and an all I frame format. The downside, as you have discovered, is a larger file size.

In summary, the smallest file size you can capture without screwing up the image is the format of the original recording - ie HDV.

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ProRes, File Formats and Sizes upon Capture (using Canon HV-20)

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