Audio in HTML5 on iPad/Mobile Safari

Nov 26, 2014

I have been testing Storyline 2, which has far improved HTML5 output (at least as far as playback on iPad is concerned), but I've got one serious issue that remains; sometimes audio plays back at speeds less than 100% (and gets staticky in the process).  It's almost as if playing a 45 record at 33-1/3 speed, although it seems, to my musical ear, that the speed shift is also varying from one instance to another; consistent during a SCO launch, but may be different on subsequent launches of the same SCO.

When the playback speed change happens, all audio seems to play at this reduced speed, including across slides.  The triggering of other timeline events and the progress shown in the seek bar are not affected.  Even more strange is that an equally random (it seems) event will correct the playback speed and all audio will begin playing back correctly, even the one(s) that initially started the period of degraded audio.

Anyone else experiencing this?  It seems more prevalent when I hit 'Next' prior to the an audio segment finishing or scrub with the seek bar.

6 Replies
Andre Van Looveren

Additional results...

I just tested on iPad Air 2 with iOS8.1 and found that the playback speed problem continues to exist.  Notably, I just experienced the first time that the playback speed was increased (chipmunk voiced narrator), though most of the time, the speed is reduced (time increased).  Some of the issues, like multiple plays of a single asset, come from scrubbing via the seek bar (rewinding or jumping ahead).

One bright spot: the slides with simultaneous video and audio (separate assets) starting at the same time, plays the video on the newer device, where the iPad3G only showed the first-frame JPEG of the video.

Andre Van Looveren

I thought that moving all the multimedia around so that they didn't share any timelines would be the key to avoiding the playback issue, but alas, I still get the reduced speed.

It seems that the most reliable (I can't say "only") situation that triggers the problem is audio that follows video (on the next slide).  I let the video slide finish, hit next, and somewhat frequently I get the reduced speed audio playback.

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