Images in video from Slideshow are dark

[dchew]

I tested creating a video from the slideshow module the other day.  I selected a few images and chose 720p.  The images rendered dark compared to the images in LR.  The attached image is a screenshot of the video overlaid on LR.  To test whether this is simply a color space conversion issue I created a jpeg (in sRGB shrunk to 1000px) from the same image, and it is not darker (similar to what is in LR).  

Anyone know why this is or if it is normal?  Am I doing something wrong?  Simple lack of color management in Quicktime?

Dave