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Problem using Videoplayer in AppDesigner Standalone-App

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Florian Schiffel
Florian Schiffel 2021-6-2
回答： Sachin Lodhi 2024-4-29
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!

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回答（1 个）

Sachin Lodhi
Sachin Lodhi 2024-4-29
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!

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