Strange interference when using Composite in on Ultrastudio

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Morgan Morel

  • Posts: 5
  • Joined: Tue Aug 29, 2017 9:41 pm
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Strange interference when using Composite in on Ultrastudio

PostFri Jan 26, 2018 10:44 pm

Hi all,

I'm experiencing a strange interference pattern when using the composite in on my Ultrastudio Express. I'm running macOS 10.12.6 on a Macbook Pro, with Desktop Video 10.9.10. The interference only appears when using composite in, the SDI in looks fine. The interference is subtle, but definitely there. I have tried different cables, different computers, different video sources, but the interference remains.

Here is a link to two videos, one captured SDI and one captured Composite. The source is the same: SMPTE Bars from the pattern generator of a DPS-575 Frame Sync (professional grade equipment).

https://drive.google.com/open?id=1tXdlO ... R32G61s57D

What is going on here?
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Dave Johnstone

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  • Joined: Mon Dec 08, 2014 11:12 am
  • Location: Adelaide

Re: Strange interference when using Composite in on Ultrastu

PostMon Jan 29, 2018 1:49 pm

This looks like a long-standing bug - see topic viewtopic.php?f=18&t=53516&p=310179

Probably best to use an external ADC and then feed SDI.

Regards,

Dave.
Freelance Television Broadcast Engineer
and Software Programmer.

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