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Does the data streaming rate is configurable ?
Posted: Mon Jan 27, 2020 5:13 am
by JosephMatan
Hi,
I'm using the NatNet SDK to stream data from the Motive OptiTrack to my client application.
I was wondering if the rate of the data streaming is configurable ?
My first guess is that depends on the cameras fps, or perhaps, maybe I can configure it to a slower rate then the cameras fps (yes, it means to skip over packets).
Thanks for the help,
Joseph
Re: Does the data streaming rate is configurable ?
Posted: Mon Jan 27, 2020 1:16 pm
by steven.andrews
Hi Joseph,
Thank you for sharing this question with the community.
Motive will stream the data out at the frame rate of the cameras. This cannot be reduced unless you change the frame rate of the cameras.
Instead of this, you may want to access the incoming data at the rate you need.
Best,
Steven
--
Steven Andrews
OptiTrack | Senior Customer Support Engineer
help.naturalpoint.com
support@optitrack.com
Re: Does the data streaming rate is configurable ?
Posted: Tue Jan 28, 2020 4:45 am
by JosephMatan
Thanks for help!!
Re: Does the data streaming rate is configurable ?
Posted: Thu Dec 21, 2023 11:54 am
by jmltorch
steven.andrews wrote: ↑Mon Jan 27, 2020 1:16 pm
Motive will stream the data out at the frame rate of the cameras. This cannot be reduced unless you change the frame rate of the cameras.
Instead of this, you may want to access the incoming data at the rate you need.
Will it actually though? Do packets get sent as soon as available and only one at a time?
I'm working with the NatNetSDK SampleClient for ubuntu and I have to time stamp frame data arrival time in the data handler callback because I can't relate any of the host timestamps to my system. I timestamp when the data handler callback is called and subtract the latency measurements provided by the frame data to get my best guess at an actual timestamp, but I noticed when looking at the dt between these timestamps it oscillates between 10ms (the expected value for 100Hz) and some tiny number that seems to indicate a batch was sent at once.
Re: Does the data streaming rate is configurable ?
Posted: Sun Jan 21, 2024 3:13 am
by Thiagoros
jmltorch wrote: ↑Thu Dec 21, 2023 11:54 am
steven.andrews wrote: ↑Mon Jan 27, 2020 1:16 pm
Motive will stream the data out at the frame rate of the cameras. This cannot be reduced unless you change the frame rate of the cameras.
Instead of this, you may want to access the incoming data at the rate you need.
Will it actually though? Do packets get sent as soon as available and only one at a time?
I'm working with the NatNetSDK SampleClient for ubuntu and I have to time stamp frame data arrival time in the data handler callback because I can't relate any of the host timestamps to my system. I timestamp when the data handler callback is called and subtract the latency measurements provided by the frame data to get my best guess at an actual timestamp, but I noticed when looking at the dt between these timestamps it oscillates between 10ms (the expected value for 100Hz) and some tiny number that seems to indicate a batch was sent at once.
It indicates that you are experiencing timestamp variations in the NatNetSDK SampleClient for Ubuntu, potentially due to batching during data transmission. Your method to timestamping in the data handler callback and correcting for lag is interesting. Consider looking into batch processing dynamics and communication patterns to get a more precise timestamp estimate.