Real-time video playback, what is the algorithm that automatically adjusts the video quality according to the network speed?

what is the algorithm for real-time video playback that automatically adjusts video quality according to network speed?

Mar.10,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b314bc-2bd7c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b314bc-2bd7c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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