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Help with Game Show recording

Hi, my college class is getting ready to use Wirecast 10.1.0 with a Wirecast Gear PC to basically record a college game show with a 3 camera setup. We are using a green screen background for all 3 camera shots and my biggest issue has been been a sluggishness when recording and, in the recording, seeing a little bit of sluggishness with people on camera. 

I have two monitors, one 4K (RUNNING AT 1080P) where my wirecast interface is and one 1080p native HD monitor with my camera shots output to it, along with the live window.

I am going to try to record in MJPEG and see if that helps. We want to record in 1080p. I may also try to eliminate the preview or live window in the Wirecast interface and put it on the output monitor to see if that helps

 

Any other suggestions? Would the output being on one monitor as opposed to the other have any effect on sluggishness?

Also, if we have to, we can eliminate the green screen keying and we can take the video to Premiere to add the green screen in. The problem I've encountered with that is that Premiere does something weird with the video once imported. I get lines across the video and it. I have included a picture of this. This is not a MJPEG file, rather it is one of the MP4 default video presets at 1080p. 

 

How can I fix this?

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  • Hi Matthew. A few ideas:

    Firstly, try looking at stats on your wirecast workstation. It will give you some numbers that might help identify some issues.

    Next: Your output encoder profile for recording - MOV creates bigger files compared to MP4, but MP4 will use more CPU or GPU power to encode. The question is - where is your bottleneck? Is it CPU, GPU, or disk IO?

    And then, you have the green screen stuff. Are you using three cameras which are each key'd? To reduce the workload - I'd try something as a test... and see if using the same key hex colour value and other settings helped to reduce the load. I have not tested this, but it cannot hurt to try. It's just a guess. Alternatively - could you use a single camera and zoom/crop to get your three contestants? That would possibly help with the load if its only keying one input source.

    And finally - there is a generic article by Craig titled "HOW TO LOWER CPU USE" - GO through some of those and see if they help. Of course, this only applies if CPU is causing your issues. It could be as I mentioned above something else.

    GK

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  • Matthew Lawson said:
    my biggest issue has been been a sluggishness when recording

     Greg makes good suggestions but perhaps you can describe what you mean by "sluggishness when recording." Generally want to keep the CPU use 60% or less and problems can get much worse as you pass 80%. Taxing the CPU or GPU can impact many things including using the user interface if that's what you mean by sluggishness.

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  • CraigS  The interface and its response to my commands is slow. My CPU usage when recording 1080p MJPEG is around 20-40% approximately. I noticed the slowness picks up when I send the multi output to another monitor. Only 3 camera feeds and the live feed on the other monitor. I guess I'm taxing the GPU on the Wirecast Gear machine. When I close the multi output to the other monitor things pick up. However, we need to see the camera feeds to simulate a studio control room setup for the students to learn how to be a technical director and director.

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  • Matthew Lawson said:
    I noticed the slowness picks up when I send the multi output to another monitor.

     That's an important detail. That means it's probably GPU rather than CPU related. 

    Matthew Lawson said:
    I guess I'm taxing the GPU on the Wirecast Gear machine.

     I think that's a reasonable assumption.

    Absolutely report this
    Wirecast Gear Support Form

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  • Matthew Lawson BTW what are the pixel dimensions of the monitor you're sending Multi-Viewer to? Going to a smaller size might alleviate some of the GPU load.

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  • Matthew Lawson said:
    The interface and its response to my commands is slow. My CPU usage when recording 1080p MJPEG is around 20-40% approximately. I noticed the slowness picks up when I send the multi output to another monitor. Only 3 camera feeds and the live feed on the other monitor. I guess I'm taxing the GPU on the Wirecast Gear machine. When I close the multi output to the other monitor things pick up. However, we need to see the camera feeds to simulate a studio control room setup for the students to learn how to be a technical director and director.

     Yes - Sounds GPU related... as suggested by Craig. That was my thinking as well - which is why I was suggesting trying one camera instead of 3, and using zoom/crop for your contestants. I am assuming each camera using chromakey will be using the GPU. By cutting that to one camera, you've dramatically reduced the workload on the GPU which might help when you add the external monitor.

    GK

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  • Greg Kuhnert CraigS I am using a 1920x1080p monitor as the multi output monitor. The main monitor is a 4k monitor running at 1080p itself (I set it to that to see if that helped, it did some). All three cameras are keyed with the same background, but on two cameras we have moved and scaled the background to match the close up shot of the contestants, if that makes sense. So two cameras are close ups of each contestant and one camera is a wide shot of the host and contestants.

    Greg Kuhnert Unfortunately, because I need to teach a 3 camera studio setup to the students, I'm not sure if we could do a one camera setup and might make it hard to do fast switching of shots from contestant to contestant. 

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  • Greg Kuhnert CraigS Would we be better off to just record using MJPEG 1080p at 30fps without using chroma key in Wirecast on any camera feed? Then take the recorded video into Premiere and add the chroma key background in Premiere?

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  • Matthew Lawson It might because chroma key is using GPU as well. I'm not sure of the exact impact.

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