Can the progressive data obscure previous portions of the image? If so, it can also be a hacky video format. EG: A flif would specify how many megabytes it us

Can the progressive data obscure previous portions of the image? If so, it can also be a hacky video format. EG: A flif would specify how many megabytes it used per second. There would not be discrete "frames". If a video flif said that it used 1MB per Second, and you wanted to see what the video looked like at 10.8 seconds, you would download 10.8MB .