I'm trying to write an .mp4 file but I keep getting permission denied

`Cannot create file VelTemp4.mp4. Permission Denied.`

I have the correct coding as I understand it but that is the only thing the error message says. I have MATLAB R2019b.

[Geoff Hayes]

Oscar - what folder are you trying to write the file to? Do you have permission to write to that folder?

[Oscar Ramos]

As far as I understand I do. I am currently running as Administrator and I have been able to write .avi files to the folder both as a normal user and as administrator.

[Geoff Hayes]

Can you write an avi file there now? Are you saying that you can write any other file type from MATLAB to that folder except MP4 files?

[Oscar Ramos]

Yes. I can write every other kind of file there. For some reason it does not allow me to write .mp4.

[Geoff Hayes]

Have you tried writing the file to a different folder? What function are you using to create the mp4? Please include the line of code.

[Oscar Ramos]

fig = figure(2)

myWriter = VideoWriter('VelTemp4.mp4','MPEG-4')

clf

I'm trying to write it while the figure is maximized.

I have not tried writing to a different folder yet.

[Geoff Hayes]

That line of code works for me, so there is nothing wrong with the way you have written it. I do suggest trying an alternative folder.

[Oscar Ramos]

It worked. Saving it to a different folder made all the difference.

Answer 1

[Susan Pizzuti]

I just had this issue and found that my antivirus "ransomware protection" was preventing matlab from writing the file. Try temporarily turning off your antivirus and see if that helps.

Answer 2

[Kondasani]

% Initialize webcam and face detector

cam = webcam();

detector = buildDetector(1, 176);

% Set up video recording

outputVideo = VideoWriter('output_video.mp4', 'MPEG-4');

outputVideo.FrameRate = 10; % Adjust the frame rate as needed

open(outputVideo);

% Initialize variables for blink and yawn detection

prevEyeStatus = false;

yawnCount = 0;

while true

% Capture a frame from the webcam

img = snapshot(cam);

% Detect face parts in the current frame

[bbox, bbimg, faces, bbfaces] = detectFaceParts(detector, img, 2);

% Display the image with bounding boxes around detected face parts

imshow(uint8(bbimg));

% Detect eye blinking

currEyeStatus = detectEyeBlink(faces{1}); % Assuming one face

% Detect yawn (based on mouth aspect ratio)

mouthAspectRatio = calculateMouthAspectRatio(faces{1}); % Implement your method

% Play beep sound for blink or yawn detection

if currEyeStatus && ~prevEyeStatus

sound(beepSound, 44100); % Play beep sound

end

if mouthAspectRatio > thresholdYawnAspectRatio

yawnCount = yawnCount + 1;

if yawnCount >= yawnThresholdFrames

sound(beepSound, 44100); % Play beep sound

yawnCount = 0;

end

else

yawnCount = 0;

end

prevEyeStatus = currEyeStatus;

% Write the current frame to the video file

writeVideo(outputVideo, uint8(bbimg));

% Exit the loop when 'q' key is pressed

if strcmpi(get(gcf, 'CurrentCharacter'), 'q')

break;

end

end

% Release the webcam and close the video file

clear cam;

close(outputVideo);