I recently had to take a video of a product I had purchased that failed to send to the vendor before they would ship me a replacement. (they said not to bother sending the defective unit back, it was not cost effective). I believe that I used 'handbrake' to change the encoding mode, the screen size in pixels, the frame rate, as well as the compression quality. I think I did something like 600MBytes down to just under 5MB, which I thought was the upper limit of what email will send. However, this was a vendor reply through amazon, and they stripped off the video as being too dangerous to forward. I was able later to send  them a separate way and I think they got the video. I certainly got the replacement.