Modern compression codecs like and AV1 have made smaller files possible. A well-encoded 720p movie using HEVC might drop to 700-800MB. However, pushing it down to 300MB requires:
: Encoders heavily rely on highly efficient video compression standards like H.265 (HEVC) and AV1 . These codecs offer vastly superior data compression compared to the older H.264 standard but require much higher processing power to decode and play smoothly. hd movies area 300mb