Blackmagic Video Input no image

RL

Hello,

I am trying to get a video input of a Blackmagic Deckling 8K Pro (on Win10). Settings are 3840x2160 25p.

I see the card in the input settings, but not getting any image. It stays black.

I checked in the MediaCapture Tool of Blackmagic and there the signal enters without issue.

Are there any limitations in Isadora?

Thank you, rené

mark_m

@rl

This should work.

Make sure the settings in Isadora are the same as in the Blackmagic Media Express app.

maybe post a screenshot of the Isadora live capture settings?

jfg

@rl

Sorry if my comment is too stupid, but do you have BM Express running at the same time as Isadora? If so, it won't work.

Best regards,

Jean-François

mark_m

@jfg said:

Sorry if my comment is too stupid, but do you have BM Express running at the same time as Isadora? If so, it won't work.

That's a really good point! And I've been caught out with that before!!

RL

@jfg

Thanks. Not a stupid question, but I am aware of the issue. BM Express is closed. I only temporarly use it for a fast check to see if the connection works, because it's the easiest way to see the input.

RL

@mark_m

Hi Marc,

hope Mobil-Pictures are ok. Was easier :)

mark_m

@rl

Thanks for posting the pictures.

All your settings look right.

I just compared them with mine. I only have an UltraStudio Recorder 3G so can only test in HD 1080 but the settings look the same in the Isadora Live Capture Settings, so I'm afraid I don't have any good ideas.

I notice that someone else posted problems with their Decklink on Windows. @callie did you ever get this working?

https://community.troikatronix...

Sorry I can't help more :-(

RL

@mark_m

I made a few more tests. I checked in other softwares, including Zoom. What I noticed: in MediaExpress the correct input is "Decklink 8k Pro #1" (no other choice). In Zoom and in another software "Decklink 8k Pro #1" doesn't work, but I get a signal on "Blackmagic WDM Capture #1".

In Isadora WDM is only available unter Driver Windows legacy and Modern, but both give an error message.

DusX

@rl said:

In Isadora WDM is only available unter Driver Windows legacy and Modern, but both give an error message.

That's expected, since Blackmagic should interface via the Blackmagic driver.
I have look over this, and the only thing I can see is that the device supplies 12bit video, while Isadora uses 8bit internally. I don't know how conversion is handled in this case. I will need to check into that. Is there any way of configuring the device to use 8bit?

Unfortunately I don't have a pc tower, or decklink, so I can't dig in to testing this.

RL

@dusx

good question. The Decklink Setup App doesn't give that option, but I will check as soon as I am back in my Studio (unfortunatelly not before friday).

However, I did check earlier my signal I wanted to capture and that leaves the device with 8bit.