Trying to run 'vision/Mo​tionBasedM​ultiObject​TrackingEx​ample' but can't open provided video file (atrium.mp4)

Hey guys, I am completely new to matlab. I am using matlab because I found this tutorial (https://www.mathworks.com/help/vision/examples/motion-based-multiple-object-tracking.html) on tracking objects throughout a video, which I want to integrate into an existing application.

So I have downloaded and installed matlab and the vision library, and opened the example using:

openExample('vision/MotionBasedMultiObjectTrackingExample')

However, in this example they reference a sample video file atrium.mp4. Every time I try to run the example I get the following sequence of errors

Error using coder.internal.errorIf (line 8)
Invalid input file.

Error in vision.VideoFileReader/setFileInfoProps

Error in vision.VideoFileReader/set.Filename

Error in matlab.system.SystemProp/parseInputs

Error in matlab.system.SystemProp/setProperties

Error in vision.VideoFileReader

Error in MotionBasedMultiObjectTrackingExample/setupSystemObjects (line 84)
      obj.reader = vision.VideoFileReader('atrium.mp4');

Error in MotionBasedMultiObjectTrackingExample (line 51)
obj = setupSystemObjects();

Not sure if it unable to find the video file or it does not like the format.. I see the file in /Matlab/toolbox/vision/visiondata/atrium.mp4, but I also tried copying the video to my home directory and used

   vision.VideoFileReader('/home/steven/atrium.mp4');

but did not make a difference..

I am using ubuntu16.04 and have matlab installed to my home folder. I have not changed anything at all so I am really unsure why this example is not working. I also tried changing the video file to a different video file but I get the same error.

Does anyone know what the issue is here? Thanks

Answer 1

[Walter Roberson]

I predict that you are using a version before R2017b and that you are having gstreamer problems as Ubuntu 16.04 provides gstreamer 1.0 but MATLAB before the current one needs gstreamer 0.1

[Steven Hsu]

Sorry, I should have specified. I am using R2017b

[FAS]

Did you find a solution to this issue?