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Cannot find an exact (case-sensitive) match for 'getFrame' ?

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I use matlab R2018b and Iwant to display a video in axes using app designer this is my code:
function importervideoButtonPushed(app, event)
% to import some thing
[a, b]= uigetfile({'*.*'});
vid = VideoReader([b a]);
while hasFrame(vid)
imshow(getFrame(vid), 'Parent', app.UIAxes1);
end
end
but when I push on the button the following error is written
what should I do ?

  8 Comments

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Walter Roberson
Walter Roberson on 27 Jul 2019
The line
vid = VideoReader(fullfile(b,a);
is missing a )
Walter Roberson
Walter Roberson on 27 Jul 2019
Remember to put in a drawnow() after the imshow()
Also, imshow() is a fairly expensive operation. It is better (faster) to create a image() object and set the the CData property of the object.
LEKHCHINE Somia
LEKHCHINE Somia on 27 Jul 2019
I did everything I had to do and all the instructions that you told me and the same first error
Cannot find an exact (case-sensitive) match for 'getFrame'
The closest match is: getframe in C:\Program Files\MATLAB\R2018b\toolbox\matlab\graphics\getframe.m
Error in app1/importervideoButtonPushed (line 27)
imshow(getFrame(vid),'Parent',app.UIAxes1);
Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 335)
Error while evaluating Button PrivateButtonPushedFcn.

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Accepted Answer

Walter Roberson
Walter Roberson on 27 Jul 2019
Edited: Walter Roberson on 27 Jul 2019
function importervideoButtonPushed(app, event)
% to import some thing
[a, b]= uigetfile({'*.*'});
vid = VideoReader([b a]);
first = true;
while hasFrame(vid)
thisframe = readFrame(vid);
if first
img = imshow(thisFrame, 'Parent', app.UIAxes1);
first = false;
else
img.CData = thisframe;
end
drawnow();
end
end

  2 Comments

LEKHCHINE Somia
LEKHCHINE Somia on 27 Jul 2019
It is my first experiance with matlab so please be patient with me
I put exactly your code but there is an error:
Undefined function or variable 'thisFrame'.
Error in app1/importervideoButtonPushed (line 31)
img = imshow(thisFrame, 'Parent', app.UIAxes1);
Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 335)
Error while evaluating Button PrivateButtonPushedFcn.
Walter Roberson
Walter Roberson on 27 Jul 2019
function importervideoButtonPushed(app, event)
% to import some thing
[a, b]= uigetfile({'*.*'});
vid = VideoReader([b a]);
first = true;
while hasFrame(vid)
thisframe = readFrame(vid);
if first
img = imshow(thisframe, 'Parent', app.UIAxes1);
first = false;
else
img.CData = thisframe;
end
drawnow();
end
end

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More Answers (1)

LEKHCHINE Somia
LEKHCHINE Somia on 27 Jul 2019
thank you so much and I hope God protects you
but I just declare this frame as private properties and replace it with app.this frame

  1 Comment

Walter Roberson
Walter Roberson on 27 Jul 2019
I guess you could do that, but it should not be needed, not unless you want to access the last frame of the video after the video is played.

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