Choppy SDI Input

[techiejay]

Hi All,

I have a camera hooked up to my Blackmagic Mini Recorder card and the picture is choppy - both in the Output Monitor and on the output itself. Cam is running 720p@50 but it almost looks like it's showing in 25p with how choppy it is.

Thing is, resource usage is low and Resolume reports 60fps output at all times so I don't think it's putting much strain on the hardware.

My output is 1080 @ 60 - could this be something to do with it?

Thanks

J

[techiejay]

Just as an update to the above, I did stay late one night and change my graphics card settings to output in 720 instead to match my SDI input, but still no dice - if anything it was worse.

Open to ideas - I do prefer to output 720 from my ATEM but I can always run it through a Decimator before it reaches Resolume so that I can scale it to match? Or are there other settings or hardware issues I should be looking at first?

Cheers,

Jay

[Zoltán]

How does your input look like in Blacmagic Media express?

Could you describe your hardware setup, what kind of machine you're using and what kinds of outputs?

[techiejay]

Hey Zoltán,

The input looks exactly the same in Media Express, this weekend I ran the input through an SDI distro first so that I could see it direct into a monitor and also see it via the PC and the monitor is just so much smoother.

Specs are as follows:

• Windows 10 Pro
• i5-3470 @ 3.20Ghz
• 8GB RAM
• 64 Bit O/S
• 256GB Seagate Barracuda SSD
• NVIDIA GeForce GTX 660 Ti

Weird thing is, when the video does get really choppy, Disk, CPU and Mem usage remains really low. Memory doesn't peak past 60% use, CPU around 25%, GFX card usage around 60%.

I'm willing to upgrade any part of the system to get this working reliably, but just don't want to invest in something that won't make any difference.

Cheers,

Jay

[techiejay]

Has anybody got any ideas on this? I just can’t seem to get SDI video input to be as smooth as it is ‘not’ via my PC, even though specific resources aren’t being maxed out

Jay

[Zoltán]

The input looks exactly the same in Media Express, this weekend I ran the input through an SDI distro first so that I could see it direct into a monitor and also see it via the PC and the monitor is just so much smoother.

So, does the output look also choppy in Media Express?

[techiejay]

Yes, exactly the same.

Cheers,

Jay

[Christoph]

did you try setting your graphics card output to 50Hz as well?

[Zoltán]

Sounds like a case for BMD support, if Media express is also choppy.

The Mini recorder is thunderbolt 2 right?
How do you connect it to your windows machine?

[techiejay]

No, it's the PCIe version