To watch a live preview of the IP camera while recording frames in real time in MATLAB, you can create a custom live preview & recording loop which manually shows each frame in a figure using “imshow” or “image” and update it in real time. A sample implementation is mentioned below:
cam = ipcam('http://<URL>','USER','PASS'); % your IP cam
KbName('UnifyKeyNames');
quit = KbName('q');
framesToCapture = 200;
videoRecord = VideoWriter('camera_test', 'MPEG-4');
open(videoRecord);
% Create a figure window for live preview
hFig = figure('Name', 'Live Camera Feed', 'NumberTitle', 'off');
set(hFig, 'KeyPressFcn', @(obj, evt) assignin('base','keyPressed',evt.Key));
assignin('base','keyPressed','');
for i = 1:framesToCapture
if ~isvalid(hFig) % Exit if figure is closed
break;
end
img = snapshot(cam);
if i == 1
hImage = imshow(img); % Show first frame
else
set(hImage, 'CData', img); % Update image data
end
writeVideo(videoRecord, img); % Record frame
drawnow; % Force update of GUI
% Check for 'q' key to quit early
keyPressed = evalin('base','keyPressed');
if strcmp(keyPressed, 'q')
break;
end
end
close(videoRecord);
clear cam;
close(hFig);
disp('Recording finished.');
