Calling Read(obj) on a video object crashes matlab

Hello, I have been hacking away at this problem for a while and cannot seem to get it. I am using video reader to read in a .mpg video file and it seems that the file has a variable frame rate. I want to find out the frames by using read(video, inf) but whenever I call read() matlab crashes with an access violation error. Is there something I am doing wrong. I will post my code below. Thanks in advance.

Calling xldat = read(video); in the code causes matlab to crash.

function()

 FileSpec = {'*.mpg'}; %'*.avi' FileSpec
[FileName,PathName] = uigetfile('k:\MP_ROOT\101PNV01\*.mpg','Select the Video File you wish to analyze');

        file_path = strcat(PathName, FileName);
        fprintf('hello video reader %s %s', FileName, PathName);

        %set video sign
        video = VideoReader(file_path);
        get(video);
        assignin('base','file_path',file_path); 
        assignin('base','video',video);

        xldat = read(video);
        NumFrames = size(xldat);
        fs = uint16(NumFrames(1,4));

        frames = read(video, [1 fs]);