Taking Video in Crop Mode will add a band of pixels at the bottom of the Video. This area is 1920 pixels wide x 8 Pixels tall, sometimes this band consist of grey pixels or worst, random noise which takes a toll on the precious data rate. I am using EOS M with the the lastest ML but it also shows on TL and older ML builds. The Video is reported in Windows file explorer as 1920 x 1088 pixels. This band can be seen with Windows Media Player (Windows 7) but is not shown with Quicktime.