HLS from flash & cam to iOS

I've been puzzling over this for a few days now.

I want to do a simple proof of concept with a live feed published from a webcam using Flash, via FMS 4.5, to an iOS device using HLS.

Is this even possible?  Here's what I've done so far.

1. Installed FMS 4.5 on new server with all defaults.

2. Proved that it's working OK by browsing the "start page" (http://(myserver):8134/index.html) on both flash and iOS devices.

Now I've tried to use the example "interactive" demo to publish my live cam feed. 

I've published to rtmp:/livepkgr

And I've called the stream livestream?adbe-live-event=liveevent

It's published and picked up OK by the Flash player on the "interactive" demo on the start page.

So that's working OK.

I then try and consume it on an iOS device.  I point the URL to

http://(myserver):8134/hls-live/livepkgr/_definst_/liveevent/livestream.m3u8

I don't get a 404 so I know I've hit a live URL but on my iPad in Safari it simply comes up with a black (not blank) page and "The operation could not be completed" popup.

I'm obviously missing one or more steps here.  Help

(do I need to code the flash publisher to encode as h.264?)

Thanks,

Puzzled