Can't connect to Atem running beta 10.3 firmware

[imorrish]

Check showed available, but can't connect

[imorrish]

Log is just full of
2026-04-17 12:55:16.715 [ERR] Faulted: The method or operation is not implemented.
2026-04-17 12:55:16.725 [INF] Reconnecting

[Kotin-ak]

Hi @imorrish,

Thanks for reporting this and providing the log snippet! The The method or operation is not implemented. error usually means the application received a specific status message or command from your ATEM model that the library doesn't know how to parse yet.

Since I don't have this specific ATEM model on hand for direct testing, I have just published a new stable release (v1.1.0) with adjustments specifically for this case:

1. Extended ATEM error logging — to capture exactly which packet/command is causing the issue.
2. Exception handling mitigations — unhandled operations should now be safely ignored instead of completely faulting the connection loop.

Could you please update to the new release: v1.1.0 and try connecting again?

If the connection is successful, that's great! If it still fails, please drop the new log file here. The expanded logging will point me directly to the missing implementation so I can quickly patch it for your hardware.

Thanks for your help!

[imorrish]

Mini's mostly don't have SDI. There should be a way of getting the input type which can be hdmi, sdi or other.

2026-04-18 13:59:01.109 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented.
System.NotImplementedException: The method or operation is not implemented.
at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel)
at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel()
at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta) at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken) at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.<RunInSta>b__0() 2026-04-18 13:59:01.224 [INF] Reconnecting 2026-04-18 13:59:01.272 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented. System.NotImplementedException: The method or operation is not implemented. at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel) at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel() at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta)
at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.b__0()
2026-04-18 13:59:04.292 [INF] Reconnecting
2026-04-18 13:59:04.330 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented.
System.NotImplementedException: The method or operation is not implemented.
at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel)
at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel()
at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta) at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken) at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.<RunInSta>b__0() --- End of stack trace from previous location --- at Atem.Core.Services.ConnectionService.ConnectAsync(String address, CancellationToken cancellationToken) 2026-04-18 13:59:07.339 [INF] Reconnecting 2026-04-18 13:59:07.389 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented. System.NotImplementedException: The method or operation is not implemented. at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel) at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel() at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta)
at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.b__0()
2026-04-18 13:59:10.391 [INF] Reconnecting
2026-04-18 13:59:10.429 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented.
System.NotImplementedException: The method or operation is not implemented.
at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel)
at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel()
at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta) at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken) at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.<RunInSta>b__0() --- End of stack trace from previous location --- at Atem.Core.Services.ConnectionService.ConnectAsync(String address, CancellationToken cancellationToken) 2026-04-18 13:59:13.444 [INF] Reconnecting 2026-04-18 13:59:13.497 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented. System.NotImplementedException: The method or operation is not implemented. at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel) at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel() at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta)
at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.b__0()
--- End of stack trace from previous location ---
at Atem.Core.Services.ConnectionService.ConnectAsync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.ReconnectLoopAsync(CancellationToken cancellationToken)
2026-04-18 13:59:16.497 [INF] Reconnecting
2026-04-18 13:59:16.552 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented.
System.NotImplementedException: The method or operation is not implemented.
at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel)
at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel()
at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta) at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken) at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.<RunInSta>b__0() --- End of stack trace from previous location --- at Atem.Core.Services.ConnectionService.ConnectAsync(String address, CancellationToken cancellationToken) at Atem.Core.Services.ConnectionService.ReconnectLoopAsync(CancellationToken cancellationToken) 2026-04-18 13:59:19.551 [INF] Reconnecting 2026-04-18 13:59:19.606 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented. System.NotImplementedException: The method or operation is not implemented. at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel) at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel() at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta)
at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.b__0()
--- End of stack trace from previous location ---
at Atem.Core.Services.ConnectionService.ConnectAsync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.ReconnectLoopAsync(CancellationToken cancellationToken)
2026-04-18 13:59:22.651 [INF] Reconnecting
2026-04-18 13:59:22.756 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented.
System.NotImplementedException: The method or operation is not implemented.
at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel)
at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel()
at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta) at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken) at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.<RunInSta>b__0() --- End of stack trace from previous location --- at Atem.Core.Services.ConnectionService.ConnectAsync(String address, CancellationToken cancellationToken) at Atem.Core.Services.ConnectionService.ReconnectLoopAsync(CancellationToken cancellationToken) 2026-04-18 13:59:25.757 [INF] Reconnecting 2026-04-18 13:59:25.807 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented. System.NotImplementedException: The method or operation is not implemented. at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel) at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel() at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta)
at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.b__0()
--- End of stack trace from previous location ---
at Atem.Core.Services.ConnectionService.ConnectAsync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.ReconnectLoopAsync(CancellationToken cancellationToken)
2026-04-18 13:59:28.808 [INF] Reconnecting
2026-04-18 13:59:28.873 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented.
System.NotImplementedException: The method or operation is not implemented.
at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel)
at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel()
at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta) at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken) at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.<RunInSta>b__0() --- End of stack trace from previous location --- at Atem.Core.Services.ConnectionService.ConnectAsync(String address, CancellationToken cancellationToken) 2026-04-18 13:59:31.874 [INF] Reconnecting 2026-04-18 13:59:31.917 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented. System.NotImplementedException: The method or operation is not implemented. at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel) at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel() at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot() at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func2 runInSta)
at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.b__0()
--- End of stack trace from previous location ---
at Atem.Core.Services.ConnectionService.ConnectAsync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.ReconnectLoopAsync(CancellationToken cancellationToken)
2026-04-18 13:59:34.930 [INF] Reconnecting
2026-04-18 13:59:34.972 [ERR] Faulted: [NotImplementedException] The method or operation is not implemented.
System.NotImplementedException: The method or operation is not implemented.
at BMDSwitcherAPI.IBMDSwitcher.Get3GSDIOutputLevel(_BMDSwitcher3GSDIOutputLevel& outputLevel)
at Atem.Core.Features.Switcher.OutputSettingsController.Update3GSDIOutputLevel()
at Atem.Core.Features.Switcher.OutputSettingsController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherController.InitializeSnapshot()
at Atem.Core.Features.Switcher.SwitcherFeatureBinder.Bind(IBMDSwitcher switcher, StateManager state, Func`2 runInSta)
at Atem.Core.Services.ConnectionService.ConnectCoreSync(String address, CancellationToken cancellationToken)
at Atem.Core.Services.ConnectionService.<>c__DisplayClass17_0.b__0()
--- End of stack trace from previous location ---
at Atem.Core.Services.ConnectionService.ConnectAsync(String address, CancellationToken cancellationToken)

[Kotin-ak]

Hi @imorrish,

You hit the nail on the head! The extended logs caught it perfectly.

As you correctly suspected, the ATEM Mini (being HDMI-only) throws a NotImplementedException when the SDK tries to query Get3GSDIOutputLevel() during the initial connection phase. This unhandled exception was crashing the entire connection loop before it could even map the inputs.

I have applied a patch that safely catches this (and GetColorimetryMode()) on models without SDI, bypassing the error and allowing the connection sequence to proceed normally.

I have published a pre-release build (v1.1.1-beta) to test this fix. Could you please download and install it from the link below to verify if it successfully connects to your Mini?

https://github.com/Kotin-ak/VRC-Releases/releases/tag/v1.1.1-beta

If it works, I will push this out as an official public hotfix. Thanks again for your patience and for providing the logs—it made fixing this incredibly fast!

[imorrish]

Sorry, no go.
Log directory gets created for device, but app crashes before file created.

Only see this in the Windows Event Log, AI might be able to find cause...

CoreCLR Version: 10.0.626.17701
.NET Version: 10.0.6
Description: The process was terminated due to an unhandled exception.
Stack:
at BMDSwitcherAPI.IBMDSwitcherStreamRTMP.GetCacheUsed(Double ByRef)
at BMDSwitcherAPI.IBMDSwitcherStreamRTMP.GetCacheUsed(Double ByRef)
at Atem.Core.Features.Streaming.StreamingController.ReadStreamState()
at Atem.Core.Features.Streaming.StreamingController.InitializeSnapshot()
at Atem.Core.Services.ConnectionService.ConnectCoreSync(System.String, System.Threading.CancellationToken)
at Atem.Core.Services.ConnectionService+<>c__DisplayClass17_0.b__0()
at Atem.Core.Services.ConnectionService.StaLoop()
at System.Threading.Thread+StartHelper.RunWorker()
at System.Threading.Thread+StartHelper.Run()
at System.Threading.Thread.StartCallback()

[Kotin-ak]

Hi @imorrish,

First and foremost, I want to sincerely thank you for your feedback, your patience, and for taking the time to extract those Event Logs.

Unfortunately, I have to admit that without having physical access to the ATEM Mini, debugging these hardware-specific crashes is currently beyond my capabilities. I just don't have enough knowledge and experience with how the Blackmagic SDK behaves across their entire lineup (I only have an ATEM 2 M/E Constellation HD in the studio to test on).

Because of this, I will have to add support for other ATEM models gradually, depending on user demand and whenever I can get physical access to the hardware.

I must admit, dealing with this SDK and hardware fragmentation is definitely not an easy topic! However, if you are ever willing to continue helping me test these "blind" patches in the future, I would be incredibly grateful for your assistance.

Thanks again for all your help and understanding!