MATLAB: How to use VideoReader to read a variable file name

Question

I am writing a function that will call many videos and take certain frames from them. I am trying to use a loop in order to allow for the function to read the video names in a folder and place them in VideoReader so I can look through many videos without having to import each video individually.

The general area of issue in the code is here:

    videos = dir(videoFolder);
    for k=3:length(videos)
        vidName = videos(k).name;
        v = VideoReader(vidName);
        %motion detection code follows
    end

where vidName returns the desired name but I believe VideoReader is searching for the file named "vidName" as opposed to the video file name it represents. I receive this error:

Error using VideoReader/init (line 601)
The filename specified was not found in the MATLAB path.
 Error in VideoReader (line 171)
            obj.init(fileName);
 Error in motion_detection (line 12)
    v = VideoReader('vidName');

Answer 1

The bug is clear in the error message: you supply a char vector like this:

v = VideoReader('vidName');

when you should be supplying the variable itself, like this:

v = VideoReader(vidName);