- Initialization: Load the video and initialize variables to control playback.
- Display Loop: Use a loop to read and display each frame of the video on the app's axis. Inside the loop, check the status of a flag variable to determine whether to pause the video.
- Pause/Resume Button Callback: Change the flag variable's value when the button is pressed to control the video playback.
How to pause and resume my video which is being displayed on a particular axis in MATLAB app frame by frame.
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Right now I'm using this code on the Pause button in the MATLAB app.
if strcmp(app.PauseButton.Text,'Pause')
app.PauseButton.Text='Resume';
pause
elseif strcmp(app.PauseButton.Text,'Resume')
app.PauseButton.Text='Pause';
pause('off')
end
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回答(1 个)
Sameer
2024-3-28
Hi Rishika
From my understanding, you want to implement a feature in your MATLAB App Designer application that allows users to pause and resume video playback on a specific axis, with the ability to control this action using a single toggle button. Your current approach using pause and pause('off') is not achieving the desired frame-by-frame video control. What you need is a method to programmatically control the video playback, allowing it to be paused at any frame and then resumed from that point, using a flag to manage the playback state within a video display loop.
To control the playback of a video in a MATLAB App Designer app, especially to pause and resume it frame by frame, you need a different approach than just using pause and pause('off'). The “pause” function is used to halt the execution of the MATLAB code for a specified amount of time and doesn't directly control the video playback. To achieve frame-by-frame control, you would typically use a loop to display each frame of the video and a flag variable to control the pause/resume functionality.
Here's a conceptual approach to implement pause and resume functionality for video playback in MATLAB App Designer:
Below is an example code snippet demonstrating this approach:
% Assume you have a video file named 'myVideo.mp4'
videoFile = 'myVideo.mp4';
v = VideoReader(videoFile);
% Initialize a flag for pause/resume
isPaused = false;
% Display Loop
while hasFrame(v) % reads and displays each frame of the video.
frame = readFrame(v);
image(frame, 'Parent', app.UIAxes); % Assuming app.UIAxes is the axes where you display the video
drawnow;
% Check if the pause button was pressed
while isPaused
pause(0.1); % Small pause to prevent MATLAB from becoming unresponsive
end
% You might want to include a small pause here to control the playback speed
% pause(1/v.FrameRate); % Uncomment to control playback speed
end
% Callback function for the Pause/Resume Button
function PauseButtonPushed(app)
if strcmp(app.PauseButton.Text, 'Pause')
app.PauseButton.Text = 'Resume';
isPaused = true; % Pause the video
elseif strcmp(app.PauseButton.Text, 'Resume')
app.PauseButton.Text = 'Pause';
isPaused = false; % Resume the video
end
end
I hope this helps!
Sameer
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