html5 video: fastest fast forward and slowest slow motion? -


wondering bounds variable rate playback html5 video.

i seem min , max out playing demo: http://www.w3.org/2010/05/video/mediaevents.html

i've done cursory glance @ specification, don't see there.

i have tested on different computers cpu powers, , found there no upper limit. however, fastest effective speed dependent on cpu power. got 15x maximum speed on corei7 -4770k @3.5ghz , got around 10x on less powered haswell corei5 @2.5ghz.

these chrome extensions used changing speed: chrome extension chrome

another chrome extension modifiable hotkeys (but needs added chrome loading unpacked extension)

update:

here related internet explorer:

the playbackrate property represents multiplier of video's intrinsic or normal playback rate, default setting of 1. if set property 2, doubles playback speed, while .5 play @ half speed. if playbackrate set negative value, in windows internet explorer 9, rounds zero, pausing playback. in internet explorer 10, negative values playbackrate cause video play in reverse. the w3c spec doesn't recommend upper limit, internet explorer limits playbackrate 8x speed.

source: using javascript control html5 video player


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