Author Topic: RAW video (was: Difference between Canon CRW and CHDK CRW?) (Read 548 times)

cybercom · « **on:** 22 / August / 2010, 07:03:57 »

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,

reyalp · « **Reply #1 on:** 22 / August / 2010, 09:29:59 »

Quote from: cybercom on 22 / August / 2010, 07:03:57

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.

cybercom · « **Reply #2 on:** 22 / August / 2010, 20:37:23 »

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.

Microfunguy · « **Reply #3 on:** 22 / August / 2010, 21:30:59 »

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

reyalp · « **Reply #4 on:** 23 / August / 2010, 00:46:31 »

Quote from: cybercom on 22 / August / 2010, 20:37:23

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?

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