RAW video (was: Difference between Canon CRW and CHDK CRW?)

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RAW video (was: Difference between Canon CRW and CHDK CRW?)
« on: 21 / August / 2010, 22:03:57 »
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There is presently a lot of interest in shooting RAW video files. When I shoot 3D Hi-def videos using twinned TX-1's, the outputs are MJPEG files which are essentially individual frames strung together to create an *.avi file. Is there some way to bypass the compression step and simply output the RAW data as a similar sequence? If so, what software might be able to interpret/process the resulting file?

TIA,
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Offline reyalp

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RAW video (was: Difference between Canon CRW and CHDK CRW?)
« Reply #1 on: 22 / August / 2010, 00:29:59 »
There is presently a lot of interest in shooting RAW video files. When I shoot 3D Hi-def videos using twinned TX-1's, the outputs are MJPEG files which are essentially individual frames strung together to create an *.avi file. Is there some way to bypass the compression step and simply output the RAW data as a similar sequence?
No, this is impossible even if you could get the raw data. To pick representative example 1280x720, 8 bit RGB* @ 30FPS is ~ 90 MByte/sec. 640x480 is ~27. Class 10 SD gives you 10 MByte/sec (SD manufacturers claim much higher rates, but those tend to be peak rates)

Even if you find a card fast enough to keep up on paper, it's extremely unlikely the cameras SD controller and other systems could. Especially on a camera that was built before cards that fast existed.

* You wouldn't actually get 8 bit RGB, but you should get the idea.
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RAW video (was: Difference between Canon CRW and CHDK CRW?)
« Reply #2 on: 22 / August / 2010, 11:37:23 »
So the closest would be to output through the USB 2.0 port on a Canon 5D Mark II (~60 mbyte/sec) directly into the computer?

I know there was some talk of this, and also for the RED cameras.

Obviously there are other issues involved, but RAW video would be awesome.
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RAW video (was: Difference between Canon CRW and CHDK CRW?)
« Reply #3 on: 22 / August / 2010, 12:30:59 »
Hi Bill.

As you know, the 5D MkII has been used professionally to make movies.

I think you need to check the appropriate forums, I have no doubt they are discussing synching and stereo.


David


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Offline reyalp

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RAW video (was: Difference between Canon CRW and CHDK CRW?)
« Reply #4 on: 22 / August / 2010, 15:46:31 »
So the closest would be to output through the USB 2.0 port on a Canon 5D Mark II (~60 mbyte/sec) directly into the computer?
You won't get 60 Mbyte/sec sustained using USB 2.0 in real world conditions, 30-35 is more likely. E.g. http://www.tomshardware.com/reviews/usb-firewire-esata,2534-5.html
Don't forget what the H stands for.

Re: RAW video (was: Difference between Canon CRW and CHDK CRW?)
« Reply #5 on: 04 / October / 2013, 01:51:30 »
I was thinking of something similar to the ML RAW Video hack.
There should be a video buffer, and RAW is only 10-bit in Canon P&S as opposed to 14-bit RAW in Canon DSLRs.

Just wondering if someone is considering this?

SDM offers 3d sync already. If any of the CCD P&S cameras can have their RAW buffer recorded - 10-bit only to SDXC.
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Re: RAW video (was: Difference between Canon CRW and CHDK CRW?)
« Reply #6 on: 04 / October / 2013, 10:24:00 »

Just wondering if someone is considering this?


srsa_4c is the person most likely to be able to help with this.


Re: RAW video (was: Difference between Canon CRW and CHDK CRW?)
« Reply #7 on: 04 / October / 2013, 10:46:03 »
Thanks David. I could not figure out how to contact that user though..
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Offline srsa_4c

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Re: RAW video (was: Difference between Canon CRW and CHDK CRW?)
« Reply #9 on: 04 / October / 2013, 14:32:34 »
There's no need for PM'ing me.
I don't think RAW video will happen anytime soon here. Here's why:
- ML's implementation can't be easily transplanted into CHDK. The needed firmware routines are different, identifying them is not an easy task.
- Lack of manpower.
If any of the CCD P&S cameras can have their RAW buffer recorded - 10-bit only to SDXC.
- The SD controller in DIGIC 4 is slow (<=20MB/s), DIGIC 5 is probably faster, but DIGIC 5 models usually have CMOS sensors. 10 bit sampling is only done in DIGIC II and III cameras, their SD controller is probably even slower.

 

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