Developing a full-length movie at a 100MB file size using HEVC (H.265) represents the extreme edge of video compression. Achieving "best" quality at this size requires aggressive downscaling and specific encoding parameters. Compression Feasibility
An encode is only as good as its source. Look for files labeled BRRip or BluRay rather than "CAM" or "HDRip." How to Play Them 100mb movies hevc best
While "100MB" is a specific target for very short or standard-definition films, many legal platforms offer efficient downloads optimized for mobile viewing: Developing a full-length movie at a 100MB file