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strawlab / strand-braid

Live, low-latency 2D and 3D tracking from single or multiple high-speed cameras
https://strawlab.org/braid/
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Strand-Cam BackendError: Node is not writable upon camera initiation #15

Closed elhananby closed 2 years ago

elhananby commented 2 years ago

Hello Andrew,

I started having this weird error occurring today. I rebooted my computer after a while, and at first it threw a lot of Negative acquisition duration? errors for two of the cameras. I tried to disconnect and reconnect all the cameras, and now several of the cameras shows this error upon initiation:

strand_cam: BackendError(PylonError(Pylon::GenericException: Node is not writable. : AccessException thrown in node 'DeviceFeaturePersistenceStart' while calling 'DeviceFeaturePersistenceStart.Execute()' (file 'CommandT.h', line 61)))

I've attached the entire terminal output for the braid-run command. terminal_output.txt

Thanks Elhanan

astraw commented 2 years ago

I'm not entirely sure but perhaps the initial Negative acquisition duration? errors are due to your computer's clock slewing to synchronized with an NTP or PTP time source? Does it go away if you leave the computer running for a while and then restart braid? You may also be able to bypass initial slewing with something like ntpdate which will probably get your clock within a few msec of correct very quickly. This is basically just a guess, though.

The DeviceFeaturePersistenceStart error is also strange. The release you are using (0.11.1) is a couple months old and I cannot understand why it would suddenly have new behavior. Did you change any settings in the configuration file? I do seem to vaguely remember something like this, although perhaps not this exact error, when trying to get loading and saving settings from Pylon .pfs files ? Did you update your Pylon drivers?

elhananby commented 2 years ago

Okay, so it seems the Negative acquisition duration error was solved by using ntpdate to correct the clock. Regarding the DeviceFeaturePersistenceStart error: I basically did a fresh install of both Pylon and Braid, as well as power-cycled all the cameras, and that seems to have solved it. I still have no idea what caused it initially.

Thank you for the very quick reply!