Thread Subject: mmreader bug

I'm having a problem with mmreader where loading consecutive frames occasionally returns the same frame image. I have checked the video an there are no duplicate frames. This happens with mpeg4 video and uncompressed. Here's some code that demonstrates the problem

mov = mmreader('video.avi');
f = 1;
h = uicontrol('Style','pushbutton','String','Start','Callback',...
    'i=read(mov, f);imshow(i);set(h,''String'',num2str(f));f=f+1;');

Clicking the button loads a frame, displays it and increments the frame number. Every 10 or so frames it loads the same frame twice in a row even though the frame number has incremented.

Has anyone else had this problem?

Peter

It's also missing the frame after it gets a duplicate. So it's basically loading the wrong frame for the frame number but then loading the correct frame afterwards.

The Problem only happens when loading one frame at a time. When loading all frames in a given range there is no duplication.
Someone else must have experienced this? Could someone try running my code above with any video and see if you get the same problem just so I can check there's not something wrong my end. I'm using R2007b.

It seems that the problem only happens in Matlab 2007. Matlab 2008b doesn't have the problem. I will upgrade.