Access color and depth frame using frame number

[akmaldeen]

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Required Info
Camera Model	D455
Firmware Version	05.12.09.00
Operating System & Version	{Win (10)
Kernel Version (Linux Only)	(e.g. 4.14.13)
Platform	PC
SDK Version	{ legacy / 2.. }
Language	{c++ }

Issue Description

Hi I'm new to realsense. I have D455 camera. I'm using c++ in windows, visual studio 2009.

I have to access a selected frame in .bag file using frame number. Let's say 50th frame is my requirement, then my code has to access 50th frame and convert it to opencv Mat file. Also I have to access the color frame depth frame separately.

Please help me with c++ example

[MartyG-RealSense]

Hi @akmaldeen It may be best to break this programming goal into two sections. First, get conversion to cv::mat of all frames working. And then add a frame index seek mechanism for specific frames once conversion for all frames is working.

In regard to the first step, a C++ bag extraction script that uses cv::mat can be found in the link below.

#1919 (comment)

For the second step (navigating to a specific frame index) with C++, the link below should be helpful:

#6577

[MartyG-RealSense]

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

[akmaldeen]

I have used disable playback technique to poll frame one by one from bag file

rs2::playback play_back = device.asrs2::playback();
play_back.set_real_time(false);

after I can access the particular frame using frame number and basic loop techniques.

Access frame number:
rs2:frameset frames = pipe.wait_for_frames();
auto color_frame = frames.get_color_frame();
auto fr_no = color_frame.get_frame_number();

Thanks for the links

[MartyG-RealSense]

Great to hear that you developed a solution @akmaldeen - thanks very much for the update!