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Record Multiple Cameras At Once
I am trying to record multiple streams with RealSense Viewer But the sync button seems to be disabled (as shown in the image above). Do I need more settings or does the viewfinder not support multi-D455 recording?
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I also found a Python script from a previous issue to capture frames from multiple cameras But I notice that there is no obvious sync operation Does the SDK provide a sync function?
Hi @Olddog In the link below, RealSense SDK Manager Dorodnik explains that the gray button at the top of the RealSense Viewer options sidebar is related to software synchronization.
Although each camera is added to the viewer options side panel it has its own record button, and enabling the record button for each camera results in independent bag file recording for each camera.
Multiple cameras can synchronize their broadcast time frames to a master signal using hardware synchronization, but this is not the same as stream recording from multiple cameras.
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Therefore, a bag file recording in the viewer should capture the currently active streams from a particular camera (for example, depth, infrared, and color), but not combine streams from all cameras into one bag.
To capture streams from multiple cameras on the same computer in one recording, it may be more practical to use ROS Its Raspberry Pi recording function can record all "topics" currently available using all its status You can launch each camera independently in a separate ROS "terminal" window and the collective themes of all camera sources should be captured by the ROSBAG record "all" function.
More information on setting up a multi-camera ROS setup with multiple terminals can be found in the tutorial at the link below.
Once a bag has been recorded with rosbagrecord, you should be able to play it and view its data in a ROS interface called RViz, as described in the link below by RealSense ROS wrapper developer Doroni.
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If you prefer a Python-based solution and are fine with storing each camera in a separate bag file, the following link can be a useful reference. Automatically starting recording for each camera with the script will make it easier to have relatively equal time in each bag, which would be difficult to achieve with the viewfinder if you had to press each camera's record button to start and stop recording.
If you prefer a Python-based solution and are fine with storing each camera in a separate bag file, the following link can be a useful reference. Automatically starting recording for each camera with the script will make it easier to have relatively equal time in each bag, which would be difficult to achieve with the viewfinder if you had to press each camera's record button to start and stop recording. #2882
Thanks for the help Now I have 3 D455 and I am connecting pin5 and pin9 in a star configuration Unfortunately I found that they are not synchronized... the frame rates of the different cameras are not the same. Need an external signal generator?
An external signal generator is not required if you set the D455's Inter Cam Sync Mode to a value of '1'. This makes it the master camera that generates a sync pulse from pin 5
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The project we are starting aims to create a program that simultaneously records depth frames from two (or more) different D435 cameras.
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Before setting up, our camera hardware was synced so that the recorded frames had aligned frame numbers. Since the viewer cannot instantly call up a two-channel log stream on the fly, we had no choice but to create one from scratch. In short, what we are doing is a combination of functions
First, the two depth frames appear to compete with each other for bandwidth resources. As you can see in my screenshot, when one camera is set as master and the other as slave, one of their frame rates will be delayed. The only logical solution is to allow multi-threaded work while streaming `
However, we are facing the problem of how to access the old pipeline with its preserved frames
The frames stored in the first loop are accessed with the following code snippet, inside
Record Playback Multiple Cameras · Issue #3802 · Intelrealsense/librealsense · Github
Of different cameras So the problem remains as to how to achieve efficient thread management as mentioned earlier We tried searching and it wasn't easy to find this specific solution from Google results (without the benefit of specifics).
Clicked, the program closes automatically As mentioned earlier, most of our runtime code was modified based on this
It's really complicated, we have no idea what to do next; So far, we are wondering if there is a replacement for the viewer to start streaming two cameras or if someone can give us some pointers to review the code.
The last rs-multicam sample should answer the problem of multiple pipeline objects for multiple RealSense devices Please see Thank you
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Still, the question stands; During the debugging process we fixed a few more bits that weren't included before First, we renamed the output .bag file accordingly for different cameras
Unfortunately, debugging here is really tedious because we have little time to understand everything we say.
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I have synced the cameras as described in the whitepaper and I can save the color and depth frames from each camera using the multi-camera and save-to-disk example, but I wanted to save the .bag file for each camera.
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Can you suggest some code done in C++ to store .bag file or point cloud for synchronous multi camera.
Hi @evarcurto Unfortunately, this issue is bothering us Synchronization between writing different Raspberry Pi files simultaneously requires understanding its internal file I/O functionality. I hope more people can contribute their ideas if it works 🙂
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I started reviewing laptops in 2009 Currently I am focusing on changing technologies, VR/AR, tablets, games and future/emerging trends. Other hobbies include magic, immersive theater, puzzles, board games, cooking, improv, and the New York Jets. My background includes an MFA
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