How to capture video from webcam in MATLAB?

vid = videoinput('winvideo',1, 'YUY2_320x240');
set(vid, 'FramesPerTrigger', Inf);
set(vid, 'ReturnedColorspace', 'rgb');
% vid.FrameRate =30;
vid.FrameGrabInterval = 1;  % distance between captured frames 
start(vid)

aviObject = avifile('myVideo.avi');   % Create a new AVI file
for iFrame = 1:100                    % Capture 100 frames
  % ...
  % You would capture a single image I from your webcam here
  % ...
  I=getsnapshot(vid);
 %imshow(I);
  F = im2frame(I);                    % Convert I to a movie frame
  aviObject = addframe(aviObject,F);  % Add the frame to the AVI file
end
aviObject = close(aviObject);         % Close the AVI file
stop(vid);

For this code I'm getting error saying

Error using avi
Unexpected Error. Reason: Failed to open file.

Error in avifile (line 175)
  aviobj.FileHandle = avi('open',filename);

Error in capture_vid (line 11)
aviObject = avifile('myVideo.avi');   % Create a new AVI file

My matlab version is R2012a

Videos captured from my webcam are stored with .mp4 format. Please help me to capture videos from webcam using MATLAB code. Thank u

Answer 1

[Walter Roberson]

Use VideoWriter instead of avifile() unless you are using a version of MATLAB before R2010b.

Also watch out for the possibility that you are not in a directory that you have write access to. The directory when you start up MATLAB is often a directory where MATLAB is installed instead of being a user directory that you can write to.