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realSense 435i Matlab Error

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Rlt1

Hi,

I am running Windows 10 and using the Matlab interface for the 435i.  I am running an example depth_example.m  .  When I run this example I get an error message 

Error using librealsense_mex
Frame didn't arrive within 15000

Error in realsense.pipeline/wait_for_frames (line 48)
out = realsense.librealsense_mex('rs2::pipeline', 'wait_for_frames', this.objectHandle);

Error in realsense.depth_example (line 17)
fs = pipe.wait_for_frames();

If I set a breakpoint on line 17 and then continue it works correctly. If I use the prebult C++ codes in the Tools folder they work correctly and I rebuilt the sln file in release and debug modes and they work correctly.  Does anyone know what is wrong or wat I am doing wrong in the Matlab codes.

Thanks

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17 comments

Date Votes
  • MartyX Grover
    • Edited

    Hi Rlt1  There was a case involving Error using librealsense_mex  Frame didn't arrive within 15000 with the depth_example.m example program in January 2021.  It was thought that the likely cause was using a MATLAB version other than the 2017b version recommended by the MATLAB wrapper's documentation (such as MATLAB 2020a).

    https://github.com/IntelRealSense/librealsense/issues/8113

    Which MATLAB version are you using please?

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  • Rlt1

    Marty

    One more thing.  I did not build from source.  I did the exe install with Intel.RealSense.SDK-WIN10-2.41.0.2657

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  • MartyX Grover

    The MATLAB version being used is likely to be the main cause of the problem, rather than the method by which librealsense was installed.  An official feature request was submitted to Intel in January 2021 to support MATLAB 2020b but there is no time schedule available for if / when it may be implemented.  In the meantime, using MATLAB 2017b with the RealSense MATLAB wrapper may be the only solution. 

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  • Rlt1

    Don't have 2017b .  Do you see the same problem with running Matlab in a Linux environment Ubuntu 18.04

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  • MartyX Grover

    The RealSense MATLAB wrapper is only for Windows 10, so there would be no way to test it in Ubuntu.

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  • Rlt1

    Marty

    Is there any documentation for the Mex file construction.  That may be a possible solution for both OS's . I've done that before.

    Thanks

     

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  • MartyX Grover

    I am not aware of an official documentation for mex file creation, though there was a RealSense user who attempted to do so.

    https://github.com/IntelRealSense/librealsense/issues/4385

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  • Rlt1

    Marty

    Wouldn't the group that built the SDK have the information for the MEX file generation

    Thanks for the Help

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  • MartyG
    • Edited

    The developer called lramati was the main programmer on the non-example core files of the MATLAB wrapper, including the mex related files, according to the GitHub details associated with the files.  

    https://github.com/lramati

     

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  • Rlt1

    Marty

    Installed Matlab 2017b and still have the same problem.  Is there a way on github to get Iramati's email address.

    Thanks

     

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  • MartyG
    • Edited

    An email contact is on the GitHub profile link above, under his name in the small side-panel.

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  • Jbutle60

    Is this issue still unresolved and the only solution is to use Matlab 2017?

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  • MartyG

    Hi Jbutle60  You mentioned in a deleted post on this forum that you had the error Unable to resolve the name realsense.pipeline when using depth_example.  The link below has information about resolving that issue.

    https://github.com/IntelRealSense/librealsense/issues/5376

     

    MATLAB versions newer than 2017 have been able to be used with RealSense cameras.

    https://support.intelrealsense.com/hc/en-us/community/posts/1500000577481/comments/1500000640542

     

     

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  • Jbutle60

    Hi MartyG,

    The behavior I am seeing with Matlab 2022b is that I can run a Matlab example once and then when I try to run an example a second time I see the error 'Frame didn't arrive within 15000'. Sometimes Matlab will completely freeze and I will need to kill it with Task Manager.

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  • MartyG

    There have been a few past cases of this error with depth_example.m.  The RealSense users in those cases found that the error disappeared if the 2017b version of MATLAB was used.

     

    Are you able to successfully use any of the wrapper's other example programs without the error occurring?

    advanced_mode_example.m
    capture_example.m
    depth_view_example.m
    pointcloud_example.m
    rosbag_example.m

     

    One RealSense user with this error created their own MATLAB depth script that worked for them.

    https://github.com/IntelRealSense/librealsense/issues/9773#issuecomment-925553900

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  • Jbutle60

    I have the same issue with the capture_example.m to.

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  • MartyG

    The RealSense MATLAB wrapper only has official support for MATLAB 2017b.  The wrapper has been able to work with newer versions (2019, 2020, 2021) without official support in the wrapper for those versions, though sometimes with errors.

     

    Do you have the option of trying the examples with an older MATLAB version such as 2020b or 2021b to determine whether the problem is with 2022b specifically, please?

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