How might I improve (make faster) my video extraction?

So, I use VideoReader to read in my MP4 (~280MB) video file:

    VidObj     = VideoReader([pname '\' fname]);

The video format for the particular file I am currently extracting is RGB24.

Here's my code for taking my video object and creating my movie array:

    MovArr = nan(ceil(VidObj.Height/space_dsFac),ceil(VidObj.Width/space_dsFac),ceil(nVidFrames/temp_dsFac));
    count = 0;
    for frame = 1:temp_dsFac:nVidFrames
        %imageData = double(read(VidObj,frame));
        imageData = uint8(read(VidObj,frame));

        %downsample
        imageDs = imageData(1:space_dsFac:end,1:space_dsFac:end,1);
        count = count+1;
        MovArr(:,:,count) = imageDs;
        multiWaitbar('Extracting video frames...', frame/nVidFrames);
    end

I'm just hoping to learn some tips and tricks for making this faster