How to do a snapshoot while displaying video stream?

[MyZQL]

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Required Info
Camera Model	D435
Firmware Version	05.13.00.50
Operating System & Version	Linux (Ubuntu 20LTS)
Kernel Version (Linux Only)	5.11
Platform	PC
SDK Version	pyrealsense 2.50
Language	python
Segment	Others

Issue Description

I'm using the pyrealsense for convenience to develop an application. How can I do an RGB snapshoot by a hot key meanwhile displaying video stream?

[MartyG-RealSense]

Hi @ZhongQingliang If you wanted to be able to save an RGB image snapshot whilst video streaming continues seamlessly then that might require the use of multithreading like the Python case linked to below, where a RealSense user had one thread for the live-captured images and another thread to write the captured images to video.

https://support.intelrealsense.com/hc/en-us/community/posts/360033158094-Recording-Video-in-60fps-with-threading-and-queue-Python-

Another Python discussion about multithreading is at #6039

If having continuous RGB streaming wasn't a requirement then a simpler Python example at #9448 (comment) demonstrates how to save an image using imwrite

[MyZQL]

@MartyG-RealSense It seems the pipeline.wait_for_frame() method can be called by different threads at the same time, isn't it?

[MartyG-RealSense]

You can move frames from one thread to another when using wait_for_frames(), as described in the section of Intel's Frame Management documentation linked to below.

https://dev.intelrealsense.com/docs/frame-management#section-frames-and-threads

[MartyG-RealSense]

Hi @ZhongQingliang Do you require further assistance with this case, please? Thanks!

[MartyG-RealSense]

Case closed due to no further comments received.