MP4 is the file format (the container), whereas MPEG-4 is the broad standard that includes various compression methods.
Разница между MPEG-4, AVC/H.264 и MP4 - Elecard 19448mp4
MP4 typically uses the H.264 (AVC) or H.265 (HEVC) codecs for video and AAC for audio. MP4 is the file format (the container), whereas