BPCC CinemaDNG Raw 15 minute time limitation True False?

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Mike K. Kroesen

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BPCC CinemaDNG Raw 15 minute time limitation True False?

PostFri Jul 26, 2013 5:23 pm

I've read that there is a 15 minute single take limit when recording 12 bit CinemaDNG Raw. Is this true? If yes, is it a function of card size limitation or what is the reason? Is there a workaround if you need to have a continuous shot longer than 15 minutes? By work around I mean one that will retain the film curve dynamic range information to avoid needing to use the REC709 color space. Thanks!
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adamroberts

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Re: BPCC CinemaDNG Raw 15 minute time limitation True False?

PostFri Jul 26, 2013 5:44 pm

Well the camera has yet to ship and from some reports it won't ship with RAW. We won't know until it actually ships tho.

I doubt it would be limited other than by the size of the card.

When shooting ProRes you will have 2 options. Video which has a Rec.709 LUT applied or Film that has a log style.
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Mike K. Kroesen

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Re: BPCC CinemaDNG Raw 15 minute time limitation True False?

PostFri Jul 26, 2013 6:23 pm

Adam Roberts thank you for the reply! Great info. I'm under the impression that RAW will be via a firmware update after shipping. I've read that in multiple locations. Do you know how much dynamic range can be retained in the ProRes HQ option using the Film log style setting? Cheers, Kroesen
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adamroberts

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Re: BPCC CinemaDNG Raw 15 minute time limitation True False?

PostFri Jul 26, 2013 6:39 pm

Not sure as the camera has yet to ship but based on using BMCC it appears that the dynamic range of the RAW data is remapped to the 10bit log file. It's pretty close to the RAW file.

What you loose is minimal compared to 8bit compressed codecs available in most cameras.
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Mike K. Kroesen

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Re: BPCC CinemaDNG Raw 15 minute time limitation True False?

PostFri Jul 26, 2013 8:26 pm

Excellent. I appreciate the reply. Cheers
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Mac Jaeger

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Re: BPCC CinemaDNG Raw 15 minute time limitation True False?

PostFri Jul 26, 2013 8:31 pm

Kroesen wrote:I've read that there is a 15 minute single take limit when recording 12 bit CinemaDNG Raw. Is this true? If yes, is it a function of card size limitation or what is the reason?

I haven't heard of such limitation in camera - but right now the largest available card that is fast enough for (compressed) raw recording is a 64 gb sandisk extreme pro, which will be full after 12 to 15 minutes. So there _is_ a sort of recording time limit, but it's not built into the camera and will rise once there are larger fast cards available. The theoretical limit for SDXC cards is around 2 TB, which would last many hours...

Keep in mind that the raw recording capabilities are not built into the cameras firmware, so everything discussed here is just based on technical considerations. Yet we expect the three cameras to share most of the software related characteristics, so looking at the Cinema Camera we get a good preview of what to expect in Pocket and Production Camera.
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Mike K. Kroesen

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Re: BPCC CinemaDNG Raw 15 minute time limitation True False?

PostFri Jul 26, 2013 8:39 pm

Thank Mac Jaeger for the reply. I had a hunch if there were a limit it had to do with the card. I agree that they will get faster too. I was happy to hear that in theory Pocket can capture the ProRes HQ can in Film Log and keep much of the dynamic range still. For $1000 that is a bargain. Beats paying $3500 for an 8GB AV Gold Ultra SCSI Drive from Micropolis a month before they went out of business and left me with a really expensive paper weight 17 years or so ago. The jumps in quality, cost, and size is mind blowing. Thanks!

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