This bug is for implementing pitch correction when playbackRate != 1.0 with MediaElements. See the below comments and the comment at this URL for more information: https://bugzilla.mozilla.org/show_bug.cgi?id=495040#c4 Matthew Gregan [:kinetik] 2009-05-27 04:33:45 PDT It'd be really awesome if our playbackRate support could do audio timescale-pitch modification, so that watching a presentation at 2x retained the original pitch. QuickTime can do this, so Safari's playbackRate already supports this. There are GPL/LGPL libraries available that we might be able to use (e.g. SoundTouch, RubberBand), since implementing this from scratch would be a decent chunk of work. Chris Double (:doublec) 2009-05-27 05:58:20 PDT I agree with comment 1. Pitch correction would be great. I regularly watch videos with other players at faster speeds and it's a big help when the player supports pitch correction.

According to http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2009-July/021100.html, Safari has an attribute controlling whether pitch correction is used when the playback rate is adjusted. I've filed https://www.w3.org/Bugs/Public/show_bug.cgi?id=15318 to suggest this the defined in the general spec.

This ended up being fixed in bug 495040.