You downloaded a video that looked great on TikTok or Instagram, and now it looks like it was filmed through a window screen. This happens more often than you'd think, and the causes range from obvious (you picked the wrong quality setting) to less obvious (the platform already compressed it before you even hit download). How Video Quality Actually Works Two things determine how good a video looks: resolution and bitrate. Most people only think about resolution, but bitrate matters just as much.