javascript - Youtube iframe embed loading flash player instead of HTML5 player -

javascript - Youtube iframe embed loading flash player instead of HTML5 player -

when seek utilize iframe embedding youtube video loads html5 player , flash player.

specifically, <iframe src="https://youtube.com/embed/m7lc1uvf-ve"></iframe> load flash player whereas <iframe src="https://youtube.com/embed/zti5s48tc7k"></iframe>will load html5 player.

when open both videos in youtube website both of them load in html5 players. cannot figure out why different videos load in different players.

it sound video comparability deepened how youtube video stored in server provide different player video played correctly. think happened old video , there nil can it.

note: person guessing of issue.

javascript html5 iframe youtube