supplierdeeply

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

  • 10 Replies
  • 2679 Views
  • Publish
    RAW video (was: Difference between Canon CRW and CHDK CRW?)
    « on: 21 / August / 2010, 22:03:57 »
    Advertisements
    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,
    ~~~~~~~~~~~~~~~~~~~~~

    <")%%%><<

    *

    Offline reyalp

    • ******
    • 9810
  • Publish
    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.
    Don't forget what the H stands for.

  • Publish
    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.
    ~~~~~~~~~~~~~~~~~~~~~

    <")%%%><<

  • Publish
    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


    *

    Offline reyalp

    • ******
    • 9810
  • Publish
    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.

  • Publish
    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.
    CHDK used for a Bullet-time sequence
    Welcome to mishra.tv productions

  • Publish
    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.


  • Publish
    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..
    CHDK used for a Bullet-time sequence
    Welcome to mishra.tv productions



    *

    Offline srsa_4c

    • ******
    • 3104
  • Publish
    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.

     

    Related Topics