[enobrev]

As far as I know the only absolute requirement is to have at least a single 64K stream. All other bitrates come as general recommendations, but in my experience, offering a few different bitrates amount to far better, smoother playback, overall.

"Warning: These requirements apply to iOS apps submitted for distribution in the App Store for use on Apple products. Non-compliant apps may be rejected or removed, at the discretion of Apple."

https://developer.apple.com/library/ios/technotes/tn2224/_in...

[flavioribeiro]

At Globo.com we use HLS as our main protocol to stream live video for both desktop and mobile.

To have HLS audio track available "for free" (without the necessity of transcode it on backend) we built a nginx module: http://github.com/globocom/nginx-audio-track-for-hls-module

It would really great to see this module being used by Dropbox also.