Most 100MB movies are not natively High Definition. To achieve such a small size, the source is often a 480p or 576p file. Encoders then use algorithms to "upscale" the resolution to 720p or 1080p. While this makes the file compatible with modern HD screens, it introduces a specific set of visual characteristics: the image might look sharper than a standard DVD, but it often lacks fine texture and can suffer from artifacting during fast-motion scenes.
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Not all movies survive the 100MB HEVC grinder. Here is how different genres fare: Most 100MB movies are not natively High Definition