bpa;346198 Wrote: 
> Some points.
> 
> * Besides possible licensing issues - it seems there is not enough room
> left in SB firmware for another decoder.
> 
> * It is not clear whether BBC will provide AACplus (not AACP) over
> Flash or not (i.e standard HTTP).  If it is over Flash (like the MP3
> streams) then SB would also have to support Flash transport. 
> 
> * AACplus is not AAC. However yo keep users happy - firmware support
> would probably have to support AAC and AACplus v1 and AACplus v2.
> 
> * I think the Blogs referred to support AACplus in addition to MP3 not
> instead of MP3.
> 
> * BBC strategy seems to be a bit flexible or not fully detailed in the
> blogs. A few months ago the only MP3 planned seemed to be secure (over
> Flash) and now these "unsecured" MP3 streams are available in addition
> to the secure MP3 streams.

The MP3-over-RTMP (in flash) was the first step of getting Listen Again
on the iPlayer. They plan to migrate to AAC+ (possibly starting from
this month) because it is already supported by flash player and is more
bandwidth efficient / higher quality.

The mp3 streams being used in the BBCiPlayer plugin were intended for
the Apple iPhone which does(will) not support abobe flash player (The
plugin has to fake an iPhone user-agent to get these mp3 streams). It
was my suggestion that these streams were just a different transport
mechanism using the same files served over RTMP/flash because of the
similarity of the bitrates.

It would seem from all the blog and forum stuff I've read that the MP3
streams will be dropped once they are happy with AAC+ and I reckon that
the mp3 will then cease for the iPhone streams because there is no
logical reason to keep mp3 for the iPhone when the more-apple-friendly
AAC+ files will be available. They don't support any more devices with
Listen Again mp3-over-http AFAIK - just the iPhone.

So in future, if this transition happens to AAC+, transcoding (e.g.
mplayer) will be required unless the SB can get AAC+ suport in the
firmware.

Regards

Phil Lewis


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