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Black level on key

Help to specific problems with your setup, or discussing CasparCG bugs

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Black level on key

Postby silid » 18 Dec 2016, 11:34

Hi

I am using CasparCG with a decklink 4k extreme feeding into an Atem mixer.

I'm finding that the key output isn't black even with no graphics present.

Is there an adjustment I can make on either of those devices to resolve this?

Thanks.
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Re: Black level on key

Postby didikunz » 18 Dec 2016, 13:29

You can adjust the key on your ATEM. See this for details: http://casparcg.com/wiki/CasparCG_Server#Blackmagic_Design_ATEM_Configuration
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Re: Black level on key

Postby silid » 18 Dec 2016, 13:36

Thanks Didi for your quick reply.

My Atem is configured as suggested, gain is disabled once pre-multiplied is selected.
The problem is the Key output is something like 95% black so I see a drop in video levels once the key is in circuit.
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Re: Black level on key

Postby didikunz » 18 Dec 2016, 14:54

Hmmm, can you check if there is a wring setting in the Decklink control panel? Id that is ok, I guess it could be a defective card.
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Re: Black level on key

Postby silid » 19 Dec 2016, 17:03

Decklink control panel looks okay to me (is there a list of recommended settings?)

I have two cards in the same machine and they both behave the same.

Is there a recommended driver version for use with CasparCG?
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Re: Black level on key

Postby silid » 19 Dec 2016, 18:16

Also, if I send key to the second decklink the black levels look okay.
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Re: Black level on key

Postby silid » 22 Dec 2016, 15:32

This is a Blackmagic Driver issue.

There is no problem in 10.3.7 or 10.5.4 but it is broken in 10.8.3 and 10.8.4.
silid
 
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Re: Black level on key

Postby premultiply » 28 Dec 2016, 16:56

Yes, since driver 10.8.2 it is broken.
Please ask Blackmagic Design Support to fix it.
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Re: Black level on key

Postby filorux » 24 Jan 2017, 23:40

Experienced the same issue. Downgrading the drivers solved it as suggested. Thanks to the op and pin down.
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    Re: Black level on key

    Postby ekelofen » 23 Mar 2017, 21:52

    I am experience the same issue using 10.8.5. I will try downgrading when I get home.
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    Re: Black level on key

    Postby premultiply » 23 Mar 2017, 21:54

    And please remember the Blackmagic Design Support to fix it...
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