About the frame drop issue reported in 2.40.0

Kota Mogami

December 21, 2021 10:53

Hi MartyG,

I have a question about the https://github.com/IntelRealSense/librealsense/wiki/Release-Notes#release-2400 which was improved in the next release with https://github.com/IntelRealSense/librealsense/pull/7983 .

Is it just a mitigation, or is it that the issue is fixed to the level that the drop rate of kernel 4 and kernel 5 are equivalent?

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MartyX Grover

December 21, 2021 11:06
Hi Kota Mogami A fix for helping to avoid frame drops was added to the SDK in 2.48.0. Here is the information from the release notes.

Increase the syncer queue on model-views.h to avoid frame drops.
This queue stores the output from the syncer, and has to be large enough to deal with slowdowns on the processing / rendering threads of the Viewer, to avoid frame drops. The problem here wasn't slowdowns of the other thread -- it was bust output from the syncer, too fast for any other thread to deal with and causing drops. The bursts are caused by latency introduced on the USB / FW side when different streams have different FPS.

https://github.com/IntelRealSense/librealsense/pull/9183
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Kota Mogami

December 21, 2021 11:09
Hi MartyG,

Thank you for the answer. Thank you also for the efforts to maintain the good software quality.
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