Set the video tag that src, does not display the video cover

Question1: set src, for video tag and set loadstart listening method for video. Src, is also set when the method is entered, but the video cover is not displayed all the time. What"s going on?

clipboard.png

clipboard.png

Question2: what are the possible reasons for setting loadedmetadata snooping for video, sometimes triggering, and sometimes not entering the method?
for the first time to make a video, ask for advice. Thank you.

Mar.11,2021

video sets the cover using the poster attribute
< video controls poster= "/ images/w3school.gif" > < / video >


We use ideojs.com/" rel=" nofollow noreferrer "> videojs

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-64f5-1bddef7-30b40.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bddef7-30b40.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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