I post a lot of hunting dog video clips on the internet. I use video conversion software to convert them to smaller file sizes to play well over the Internet. HiDef file sizes almost always break down because of the large amount of information being downloaded. Using smaller file sizes does slightly diminish to picture quality but usually, not a lot. It is like the diference in posting bitmap pictures and jpeg pictures over the Internet. Jpeg pictures are much quicker and you don't loose much quality.