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  • 1.  Framebuffer with low Frame Delay

    Posted 12-11-2013 10:05

    what frame buffer hardware has under XPression the smallest frame output delay? And how many frames are those?



  • 2.  RE: Framebuffer with low Frame Delay

    Posted 12-11-2013 19:39
    Matrox XMIO2 and AJA Kona3G/Corvid22 would be the lowest. Blackmagic is usually higher. The number of frames of delay are configurable in both cases. The higher the delay the more buffering in place there is to counteract any other activity occurring on the machine.

    The minimum delay would be around 3 frames on the output.


  • 3.  RE: Framebuffer with low Frame Delay

    Posted 12-11-2013 20:42

    I have same problem like Thomas. My company use Carbonite and Xpression for in-house program. The issue is every time I trigger GPI event from Carbonite to Xpression, it would at least take 10 frames, worst case 15 frames to bring the CG on air...

    I sent this question to Ross service department but no answer... could anyone share his/her experience with me about the best way to setup the RossTalk with lowest frame delay?

    P.S.: my company use Xpression Prime with Blackmagic


  • 4.  RE: Framebuffer with low Frame Delay

    Ross Staff
    Posted 12-13-2013 20:38

    I would speculate the delay is likely a caused by the network. Are you on a 10/100 switch or a GigE switch? The Carbonite sending a command and XPression receiving and executing the command should be essentially instantaneous.

    Regardless, to fix the delay issue a great potential solution is to use the second nic ports on the Carbonite frame and XPression unit. Run a network cable from the second nic port of the XPression to the second nic port of the Carbonite. Configure the network on both nic ports to be in the same range.

    You can test the communication/confirm the connection is working by removing the cable on nic one of the devices and pining the IP address of the Carbonite from XPression.

    Let us know if you have any questions or issues after making this change.

    Thank to Les O'Reilly for suggesting this idea to me!


  • 5.  RE: Framebuffer with low Frame Delay

    Posted 12-14-2013 05:45

    Thank you for your comment. Our system is on a Gigabit ethernet network... I will keep you updated after I try your suggestion to connect two platforms through second NIC.



  • 6.  RE: Framebuffer with low Frame Delay

    Ross Staff
    Posted 12-18-2013 14:06

    Also note that when the switcher sends the command -- there is an amount of time that the message takes to be processed. Then the Scene does have to be taken online. With Datalinqs and also Videos in the scene XPression needs to load these to cache and then take them online. This will also add some frames of delay.

    You might be seeing the sum of all of these items come to play. The only thing we can suggest for now is that you do implement the direct cable between them as it will take the switch out of the mix, but you will still have a processing delay from when you send the command to when actions can reflect this command.



  • 7.  RE: Framebuffer with low Frame Delay

    Posted 12-19-2013 12:00
    Hi Garner and Les,

    Thank you for all your input. When I want to change Carbonite connect to second NIC, I realized that Carbonite's current network cable is connected to its second NIC. Will it be a reason causing this issue? Furthermore I've tried to Ping Carbonite from Xpression, the latency is shorter then 1ms. It even shows "0 delay" between two platforms on command prompt.

    Then I start to think the delay might be caused by Xpression processing time. All graphic I want to bring on air is "TGA Sequence" video, and it seems taking longer time to load. So, I use "Xpression Video Coder" to transcode these sequences into Xpression AVI and see latency time become shorter. Just like Les's explanation, Xpression takes a few time to load scenes and time being taken is related to complexity of scenes.

    If the delay is really no way to avoid, how would you recommend me handle 3 keyers and Xpression at the same time perfectly? Use Media transition to cover this drawback? What would you do for it?

    Thanks a lot for your help,