d6jg wrote:
> I hadn't realised that the BBC iPlayer Plugin was coded like that but
> yes if you change & to & you get DASH at 339kbps otherwise you get
> 320kbps HLS
>
> @bpa - have you noted this ?
Have you got that backward ?
DASH & HLS - 101
Bandwidth is declared in the initialisation parts of the streams - the
actual bandwidth could be a fraction or even a multiple - the plugin
does not calculate it or estimate it - just displays what it is told.
AFAIK BBC use the same AAC stream same compression (i.e. compression is
just done once for all for each quality ) and then put into different
transport protocols.
HLS initialisation - (note BBC have 320000 as part of the URL)
Code:
--------------------
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=339200,CODECS="mp4a.40.2"
http://as-hls-uk-live.akamaized.net/pool_904/live/uk/audio_pop_up_01/audio_pop_up_01.isml/audio_pop_up_01-audio%3d320000.norewind.m3u8
--------------------
DASH initialisation
Code:
--------------------
<AdaptationSet group="1" contentType="audio" lang="en" minBandwidth="128000"
maxBandwidth="320000"
segmentAlignment="true" audioSamplingRate="48000" mimeType="audio/mp4"
codecs="mp4a.40.2" startWithSAP="1">
<AudioChannelConfiguration
schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
<Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
<SegmentTemplate timescale="48000"
initialization="audio_pop_up_01-$RepresentationID$.dash"
media="audio_pop_up_01-$RepresentationID$-$Number$.m4s" startNumber="1"
duration="307200"/>
<Representation id="audio=128000" bandwidth="128000"/>
<Representation id="audio=320000" bandwidth="320000"/>
</AdaptationSet>
--------------------
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