Take Recorder Freezes for 10-15 Seconds before recording

Development Cinematics & Media Virtual Production
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1

Hello,

We are using Take Recorder via a UDP trigger in a PyQt window to record takes in Unreal Engine.

Usually it records fine with no delay, but now in 5.6 we are seeing a 10-15 second delay when a large USD file is loaded. This was not happening with our code in 5.2 (Though before we used TakeRecorderBlueprintLibrary).

Unreal will freeze and lock the window. If we try to do anything, Unreal will crash. If we just wait, it will usually record fine after 10 to 15 seconds of freezing.

10-15 Seconds is an eternity to wait for every take so we would love to get this ironed out promptly. Thank you.

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2

Steps to Reproduce
Load large USD into Unreal.

Basically run the following code:

take_recorder_cmds = unreal.get_engine_subsystem(unreal.TakeRecorderSubsystem)

take_recorder_cmds.set_slate_name(take_info.TakeName)
take_recorder_cmds.set_take_number(take_info.TakeNum)
take_recorder_cmds.start_recording()

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3

Hello are you able to take a Insights Trace and share it with us?

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4

Thanks for this. Give me a beat to get this in front of an engineer.

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5

Hey Nateon just to confirm are you using Mocap Manager in 5.6?

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6

Ok a couple of the devs had a look at your trace. They think its due to something that got fixed in 5.7. There’s an event bound to OnAssetRegistryUpdated that gets hit on start and stop recording. So that would tally with the big hitch on both. If you are indeed using Mocap Manager and want to stay in 5.6 you have a couple of options. You can just close MocapManager or you can adjust the BP manually. The fix in in these two pieces here in the class /PerformanceCaptureWorkflow/Common/AssetPicker/EW_AssetPickerDropDown

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7

Update: Just checked in with the team and it turns out we saw the freezing of Take Recorder when Mocap Manager was closed.

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8

I see. The traces you sent point to the issue that I mentioned above. Do you have any traces without using Mocap Manager I can pass along?

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9

You mean this platform is limiting you? If so you can just share them with a GDrive or box link or something if you want.

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10

Yes, we are in production now but will be sure to get a trace in the the next week or two when we see the bug.

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11

Attached are the trace files, we were able to take some time and get it done today. Let us know if these offer any insight, thanks.

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12

That is correct

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13

Ok, thanks for putting in the work on this. We will give it a try.

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14

Have been unable to upload additional traces, not sure why

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15

I have been unable to upload additional traces, not sure why

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