Problem using Videoplayer in AppDesigner Standalone-App

I use the Appdesigner to generate a standalone Application to analyse a videofile for certain objects.

When opening the file and generating the VideoPlayer it gives me the following error:

Warning: Configuration file not found. Property assignment is not allowed when the object is empty. Use subscripted assignment to create an array element.

Error in matlabshared.scopes.UnifiedSystemScope/launchScope (line 145)

Error in matlabshared.scopes.UnifiedSystemScope (line 23)

Error in vision.VideoPlayer

Error in combined/StartTrackingButtonPushed (line 287)

Error in appdesigner.internal.service.AppManagementService/tryCallback (line 368)

Error in matlab.apps.AppBase>@(source,event)tryCallback(appdesigner.internal.service.AppManagementService.instance(),app,callback,requiresEventData,event) (line 37)

Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 386) Error while evaluating Button PrivateButtonPushedFcn.

The line calling the VideoPlayer is:

videoPlayer=vision.VideoPlayer('Position',[0,0,app.videoReader.Width,app.videoReader.Height]);

The error only occurs when running the exported standalone application and not when running the application in the AppDesigner or as an internal Matlab App.

How can I fix this error? Thanks in advance!

Answer 1

[Sachin Lodhi]

Hello Florian,

I understand that you are facing an error while using "vision.VideoPlayer" in a stand-alone application. It is because, "vision.VideoPlayer" object is not deployable. The following documentation lists all the functions that can be deployed on a stand-alone application:

https://www.mathworks.com/help/vision/referencelist.html?type=function&capability=codegen#:~:text=Video%20Classification

As it is stated in the documentation that "vision.DeployableVideoPlayer" is deployable on stand-alone application, you can use it in place of "vision.VideoPlayer" to resolve this issue.

videoPlayer = vision.DeployableVideoPlayer('Position', [0, 0, app.videoReader.Width, app.videoReader.Height]);

For more information on "vision.DeployableVideoPlayer" please refer to the following documentation:

https://www.mathworks.com/help/vision/ref/vision.deployablevideoplayer-system-object.html

I hope this helps!