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Forums AJA Video Systems Cam to IoXT as fast as IoXT to Comp via Thunderbolt?

  • Cam to IoXT as fast as IoXT to Comp via Thunderbolt?

  • Frank Black

    December 18, 2011 at 8:43 pm

    Hey guys, do you know if when connecting an IoXT to serve as the middleman between a camera and a computer, does the camera transfer via SDI to the IoXT as fast as the IoXT afterwards transfers to the computer via Thunderbolt.

    I just realized that whats the big deal about thunderbolt if it still takes the same amount of time for the camera to transfer to the IoXT passthrough as it did for the cam to transfer directly to the comp via SDI to an internal IoExpress.

  • gary adcock

    December 19, 2011 at 3:30 pm

    [Frank Black] “whats the big deal about thunderbolt if it still takes the same amount of time for the camera to transfer to the IoXT passthrough as it did for the cam to transfer directly to the comp via SDI to an internal IoExpress.”

    HDSDI is used mainly for realtime viewing of uncompressed video images.

    Thunderbolt is used to connect storage and other devices to a computer, it can handle both display and content on the same pipe, but it is not a Video Interface.

    Playback of images from a camera would be the same in both cases

    However the Transfer of data from that camera over Thunderbolt would be considerably faster than is possible over an HDSDI connection (this is called HSDL- and is used on film scanners and on high end cameras like Alexa and f65 but no where else)

    gary adcock
    Studio37

    Post and Production Workflow Consultant
    Production and Post Stereographer
    Chicago, IL

    https://blogs.creativecow.net/24640

  • Frank Black

    December 20, 2011 at 12:32 am

    so if i have a cam connected to an aja via sdi, and aja to a mac via thunderbolt, then would the footage get from the cam to the aja as fast as it would from the aja to the mac?

  • Jeremy Garchow

    December 20, 2011 at 3:16 am

    You have to understand you won’t be transferring your camera’s native files, you will be recording the video signal to your harddrive, probably to ProRes .movs using something like the free VTR Exchange.

    Jeremy

  • Frank Black

    December 20, 2011 at 9:45 am

    are you saying that i’ll be transferring the signal of the playback of the recorded file?

  • Jeremy Garchow

    December 20, 2011 at 1:14 pm

    No. It’s a real time record as you’re shooting.

  • gary adcock

    December 20, 2011 at 2:08 pm

    so if i have a cam connected to an aja via sdi, and aja to a mac via thunderbolt, then would the footage get from the cam to the aja as fast as it would from the aja to the mac?

    The IoXT requires a computer, it is not a stand alone device, so I do not understand your question.

    The IoXT is a Kona Card accessible externally via Thunderbolt, it will respond the same manner as a Kona Card, so you can handle what ever formats your storage will allow you to record.

    No cameras currently have Thunderbolt ports, but Canon and others have announced that they will support it.

    gary adcock
    Studio37

    Post and Production Workflow Consultant
    Production and Post Stereographer
    Chicago, IL

    https://blogs.creativecow.net/24640

  • Jeremy Garchow

    December 20, 2011 at 3:44 pm

    SDI is typically not a file transfer system, except in the situation that Gary alluded to earlier.

    The ioXT is a video device which will allow you to record Quicktime Movies on to your computer/storage.

    So, as you shoot, you will record, just like a tape. Instead it’s direct to Quicktime movies. You can then take those Quicktime Movies and edit with them. The files that are recorded to your onboard camera can be used as backups of your footage.

    What camera are you planning on using?

    If you need a stand alone device, the AJA KiPro series might be an option. The ioXT also has advantages in that it will also serve in the edit (that is if you are planning to edit as well).

    Jeremy

  • Frank Black

    December 21, 2011 at 12:44 am

    to Jeremy: but it’s only real-time if I have the camera connected to the AJA as I’m shooting, such as in a broadcast environment — no?

    to Gary: what I mean is — if I’m using the AJA to transfer footage stored on a camera card onto a computer, I’ll have the camera hooked up to the AJA via SDI, and the AJA to the Mac via Thunderbolt. Once the footage reaches the AJA, it will move on to the Mac at 10Gbps. But at what rate (and this question reveals that I’m a novice) will the footage “reach” the AJA from the camera card through SDI?

    to Jeremy: I’ve been speaking to the AJA guys and they mention the KiPro too….. at the moment I’m not using a camera w/ SDI but researching.

    Guys thanks a lot.

  • Frank Black

    December 21, 2011 at 1:42 am

    hey guys, what does it mean that “Thunderbolt can run for 100 metres over optical fibre without a repeater.” — something I found online. does this mean that we dont have to go with the 6′ thunderbolt cable?

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