HDMI inputs not ready (for a while) after computer boots

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divisionbyzero

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  • Joined: Tue Sep 06, 2022 7:51 am
  • Real Name: Bas van den Berg

HDMI inputs not ready (for a while) after computer boots

PostThu Jan 12, 2023 2:58 pm

Hi all,

We've got an issue that we seem to be unable to solve. I hope there is someone that recognizes this and is able to help with a solution.

The case is that we build video recording software that uses Decklink inputs (and outputs). Multiple inputs will be used to create a video. The computers we use start our software after boot (Windows logs in automatically and the task that start the software has a delay). This works well for SDI inputs. But in case of HDMI inputs sometimes the inputs fail to initialize. We experimented with the delay (10 seconds - 2 minutes). We also tried several types of DeckLink cards, but that doesn't make a difference. In all cases we made sure the input signal was available (even used EDID emulator/dummy plugs to make sure that the preferred resolution and refresh rate were always the same).

If we stop our software and wait for a bit and start it again, the HDMI inputs will be available (in some cases we needed two restarts).

To find out if it is a bug in our software we replaces starting our software by starting Black Magic Media Express. In those cases we see the same behavior. In most cases the HDMI input work like a charm. In some cases (4 out of 10 boots) the HDMI inputs fail to initialize.

We've tried to keep re-initializing when this happens, but that's kind of a hacky solution and doesn't work too well.

We've tested Desktop Video software from version 9 to the current version. The issue seems to be there in all those versions.

Does anyone recognize this issue? Are there any solutions that you guys know of?

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