danco wrote: 
> The specific program was the CMA awards (Radio 2, Wednesday 2 p.m.),
> though the same happened on a later program, but one earlier program I
> tried worked fine.
> 
> I was rather surprised that iPlayer Extra and iPlayer gave different
> result (Extra giving this strange message, and iPlayer running properly
> for a few seconds and then stopping).

Playing a program has two steps
(i) Find content - BBCiplayer finds content from BBC 7 day feed.
BBCiPlayerExtra find programs from unofficial feeds and can access 30
day or more content.  Once content is found (i.e.an URL) - both plugin
pass the URL to a 2nd part of BBCiPlayer to play.
(ii) BBCiPlayer 2nd part implements playback of Flash, DASH and HLS. 
The playing part takes an iplayer:// URL and decides which format to use
and then plays it.  This part of plugin also obtains metadata - again
independent of format.

BBCiPlayer uses an official BBC feed - Extra uses unofficial feeds (i.e.
old offical feed now unsupported or raw web page info) which means BBC
can change format as they wish.  I expect the Extra to die completely
sometime as BBC are slowly changing the web interface underpinnings to a
more secure private feed.

>  Do you recommend using DASH rather than HLS? I think at one point HLS
> was the preferred (or else I was having problems with DASH) and I have
> never moved away from that. Maybe it is time to move.

At one point there was a difference in audio quality so user preferred
DASH but I think now both use the same AAC content.

Main difference between DASH and HLS:
(i)  I can't update HLS as I don't have any reference player so no new
BBCiPlayer feature on HLS
(ii) 1.5.x DASH can use HTTP/1.1 with a single TCP connection per stream
whereas HLS will still use HTTP/1.0 with a TCP connection (and DNS
lookup) per 6 sec chunk. This can result in rebuffering in live streams
at busy time.


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