Usually the bitrate of a 720p video is 17Mbps (that is 17 million bit per second). Since 1 byte 1B=8 bits, this means the bit rate is 17/8=2.1 mega Bytes per second (2.1 MB/s). 1 minute=60 second, so it takes
about 120 MB (or less, so lets say 1 minute=
100 MB (mega bytes).
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