How can I read a frame from a video?

>> M=mmreader('00097.avi'); 
for ii = 1:length(M) 
oneFrame = read(M, ii); 
end 
imshow(oneFrame);xx=imread(oneFrame);

??? Error using ==> strfind
Input strings must have one row.

Error in ==> imread at 340
if (strfind(filename, '://'))

Answer 1

[Walter Roberson]

imread() is used to read files, such as .jpg files, and it requires a filename as its argument. You are instead passing it the frame data array that you are getting back from the read() operation, which is already a decoded image.

I suggest you read the example at http://www.mathworks.com/help/matlab/ref/mmreaderclass.html

and also pay attention to the way they figure out the number of frames there.