It depends on the Video Software that was used to encode the Video. Some may encode using an MPEG-4 or AAC Codecs and the Video will be at regular Size of 150MB or sometimes less depending on the length of the Video. Others may encode using the H.264 Codec and it will take that same Video and make the size 3 or 4 times larger depending on the Screen Resolution Size whether 720p or 1080p was chosen in their settings.FPS also have a difference as well in the outcome of the size. The encoding Software I use I could re-encode that 535MB Video between about 80MB - 100MB using a .avi Format and Xvid or AC3 Codecs without affecting the actual quality of the Original Video. I don't worry much about using that HD (High Definition) stuff. It's just a waste of Bandwidth and System Resources to download. Most users with a Standard 30 inch or Less LED Monitor would never see much difference between a 720p or a 1080p Video. Most Downloaders today have Unlimited Usage Internet Plans so the size of the Video Downloaded doesn't matter to many but the ones that are Metered on their Bandwidth have to watch how much they Download as they have to pay their Internet Provider more Money for going over their Allotted Data Usage and those extra charges can be quite extensive depending on who they have for an Internet Provider.