Level Clipping using DeckLink 4K Extreme

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Morgan Morel

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  • Joined: Tue Aug 29, 2017 9:41 pm
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Level Clipping using DeckLink 4K Extreme

PostWed Nov 08, 2017 7:02 pm

Howdy,

It appears that later versions of Desktop Video Software (10.6.x and on) are clipping the levels on SD Composite signal. Earlier versions allow for full-range signal (8-bit values of 0 to 254, or 10-bit values of 0 to 1023), but later versions clip at Broadcast Range (8-bit values of 16 to 235, or 10-bit values of 64 to 940).

The clipping appears to be related to hardware as well. I have 4 machines using a DeckLink 4K Extreme card via PCIe which all have this clipping with versions later than 10.6.x. However, I have a machine using an Ultrastudio Express via Thunderbolt and this is able to use version 10.8.5 without any clipping problems.

I know that the Converters software has a switch to toggle this clipping. Can we please a patch that allows us to do this with the latest version of Desktop Video? I am one of many people using this hardware for analog video preservation and we need to capture full-range signals for non-broadcast materials. Many of us are stuck using older versions of the software because of this issue, please help!
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Morgan Morel

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  • Joined: Tue Aug 29, 2017 9:41 pm
  • Location: San Francisco

Re: Level Clipping using DeckLink 4K Extreme

PostMon Jan 22, 2018 10:28 pm

Hi, just an update:

This problem still exists with Desktop Video 10.9.10. I spoke with someone at Black Magic support and was told that they did testing and confirmed that problem does in fact exist and that the tech team knows about it. If this is the case, why hasn't it been fixed yet. I'm currently forced to use Desktop Video 10.6.8, which is leaving me behind in many other areas. Please fix this issue, or at least acknowledge that it exists!
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