Re: Support for live radio Shoutcast streams

2014-12-19 Thread Vangelis forthnet 

On Sat Dec 13 05:06:52 GMT 2014, I wrote:


I was browsing the code of your latest get_iplayer commit git-d1caff0:
Added support for live radio Shoutcast streams
(snip)
$shoutcast_mediaset = 'http-icy-aac-lc-a';
(snip)
you are using ONE FIXED shoutcast_mediaset
(snip)
But THERE EXIST two more shoutcast_mediasets:
$shoutcast_mediaset = 'http-icy-aac-lc-b'
(snip)
$shoutcast_mediaset = 'http-icy-he-aacv2-a'
(snip)
What are your thoughts on adding support
for these additional shoutcast_mediasets?


On Sun Dec 14 15:09:39 GMT 2014, dinkypumpkin wrote:


I've removed the Shoutcast code.
Too many ways the BBC could blow it up
when they begin bringing more Shoutcast streams online


Hi :-)

I have a vested interest in the Shoutcast code, since
the default shoutcast stream for overseas IPs (i.e.
AAC-LC@56kbps,32kHz) is somewhat better to
both flashaaclow  hlsaaclow liveradiomodes -
the only available modes overseas, which
are both HE-AACv2@48kbps,44.1kHz .

I have continued trialing the shoutcast live streams;
I can safely say, after many hours of recording these
last days, that they are very reliable and solid (connectionwise),
equal (or better) to the RTMP live ones...
The same cannot be told about the HLS live streams, which,
due to their inherent fragmented nature, do not give perfect
results: a live HLS stream is a succession of small chunks
of files that FFmpeg must concatenate in real time; I have
experienced broken connections  missed fragments
(each comes with a 10sec duration); even when all works well
during recording, when playing back the saved HLS stream
I can clearly detect the points of concatenation numerous
times during the playback (more than 20 non-perfect joints
perceived during a 1hr long stream). And this is with latest
FFmpeg 2.5.
For now, I took it upon myself to include the two additional
shoutcast_mediasets to DP's code; I have attached a patch,
Shoutcast.patch, to be applied to commit git-d1caff0 of the
main script, found here:

http://git.infradead.org/get_iplayer.git/blob_plain/d1caff0e19139eba4f4e6cac826a6ebf7061e295:/get_iplayer

With the patch applied,

perl get_iplayer-gd1caff0.pl --type=liveradio --pid=bbc_radio_one -i

will show (if in UK) in the modes line:

modes:  default: 
flashaaclow1,flashaacstd1,hlsaacstd1,hlsaacstd2,shoutca

staaclow1,shoutcastaaclow2,shoutcastaacmed1,shoutcastaacmed2,shoutcastaacstd1,sh
outcastaacstd2

shoutcastaacstd = AAC-LC 128kbps (320 for R3), 44.1 kHz
shoutcastaacmed = AAC-LC 56kbps, 32 kHz
shoutcastaaclow = HE-AACv2 48kbps, 44.1 kHz

if overseas:

modes:  default: 
flashaaclow1,hlsaaclow1,hlsaaclow2,shoutcastaaclow1,sho

utcastaaclow2,shoutcastaacstd1,shoutcastaacstd2

shoutcastaacstd = AAC-LC 56kbps, 32 kHz
shoutcastaaclow = HE-AACv2 48kbps, 44.1 kHz

perl 
get_iplayer-gd1caff0.pl --type=liveradio --pid=bbc_radio_one --modes=shoutcastaac 
--shoutcast-liveradio-opts=-loglevel 
info --ffmpeg-liveradio-opts=-loglevel info --force --stop 3600


will record 1 hour's worth of R1's shoutcast (live) stream.

Thought I'd share if anyone's interested...

Merry Xmas,
V. 


Shoutcast.patch
Description: Binary data
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Re: Support for live radio Shoutcast streams

2014-12-14 Thread dinkypumpkin 

On 13/12/2014 05:06, Vangelis forthnet wrote:

I was browsing the code of your latest get_iplayer commit git-d1caff0:

Added support for live radio Shoutcast streams


I've removed the Shoutcast code.  Too many ways the BBC could blow it up 
when they begin bringing more Shoutcast streams online, which is a 
headache I don't need.  I'll probably bring it back at some point after 
the BBC makes its changes.




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Re: Support for live radio Shoutcast streams

2014-12-14 Thread Christopher Woods 
They're already available (but as AAC, not MP3), search for 'BBC AAC 
streams'. You need to point your player to the .pls playlist URL for each 
stream, the access token contained within is uniquely generated per access 
and has an immediate expiry.


IIRC the playlist files basically link to the CDN P  Q endpoints through a 
couple of different routes. Most stations are 128kbps AAC LC, Radio 3's 
also available as 320kbps.



On 13 December 2014 06:03:30 Vangelis forthnet 
northmed...@the.forthnet.gr wrote:



Now that I remembered,

http://www.bbc.co.uk/blogs/internet/posts/BBC-Radio-to-stop-supporting-Windows-Media-on-December-31st

 We will provide a SHOUTcast mp3 stream of all our radio stations
 so that live radio will continue to work on internet radio devices
 for another year or two.
 This mp3 stream will be up and running before support
 for Windows Media is switched off.

 Has anyone been able to find more info on this/sniff any of those streams?
Or is it still too soon?

V.


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Re: Support for live radio Shoutcast streams

2014-12-14 Thread Vangelis forthnet 

On Sun Dec 14 23:41:56 GMT 2014, Christopher Woods wrote:


They're already available (but as AAC, not MP3)


Hello, Christopher.
These Shoutcast AAC streams have been available
(though kept semi-clandestine by the beeb) for more
than three and a half years, see:

http://forums.digitalspy.co.uk/showthread.php?s=0ed858cc0d2f88baedb7e055be968598t=1473061

and you can rest assured I made good use of them,
both for listening and for recording (!).

My impression is from reading the BBC Blog entry
I referenced earlier in this thread that they are planning
to issue new MP3 Shoutcast streams as a substitute
for the WMA live streams - to be killed on Dec 31st -
for older digital devices that still rely on them and are
not compatible with the AAC codec.
We'll have to wait and see what they'll do;
maybe as yet another cost cutting measure
they'll convert the existing Shoutcast AAC streams to
Shoutcast MP3 ones (quite easy to do) and
keep the higher quality AAC codec only for
AppleHLS streams (already in use), AdobeHDS
ones (announced for sometime in 2015) and
MPEG-DASH ones (already experimented with).

Cheers 



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Support for live radio Shoutcast streams

2014-12-12 Thread Vangelis forthnet 

Hello dinkypumpkin :-)

I was browsing the code of your latest get_iplayer commit git-d1caff0:

Added support for live radio Shoutcast streams

http://git.infradead.org/get_iplayer.git/blobdiff/97967add4aaa8e3950221e70f8548a46f0ae01fb..d1caff0e19139eba4f4e6cac826a6ebf7061e295:/get_iplayer


@@ -7245,11 +7251,12 @@ sub get_stream_data {
(snip)
+   my $media_stream_shoutcast_prefix;
(snip)
+   my ($mediaset, $mobile_mediaset, $shoutcast_mediaset);



@@ -7257,10 +7264,12 @@ sub get_stream_data {
(snip)
+   $shoutcast_mediaset = 'http-icy-aac-lc-a';
(snip)
+   $media_stream_shoutcast_prefix = 
http://open.live.bbc.co.uk/mediaselector/5/select/version/2.0/mediaset/$shoutcast_mediaset/vpid/;; 
# $verpid



@@ -7411,6 +7427,20 @@ sub get_stream_data {
(snip)
+   # shoutcastaachigh
+   if (  $mattribs-{bitrate} = 192 ) {
(snip)
+   # shoutcastaacstd
+   } elsif ( $mattribs-{bitrate} = 96 ) {


I won't pretend I fully understand all the code in this commit,
but AFAICT you are using ONE FIXED shoutcast_mediaset -
as you surely know, the mediaselector/5 API (I'll call it ms5)
uses geo-location; for all National Radios but Radio 3, ms5, when
tried from a UK IP, returns streams which have a real bitrate of
128kbps@44.1kHz; e.g.

http://open.live.bbc.co.uk/mediaselector/5/select/version/2.0/mediaset/http-icy-aac-lc-a/vpid/bbc_radio_one

whereas Radio 3:

http://open.live.bbc.co.uk/mediaselector/5/select/version/2.0/mediaset/http-icy-aac-lc-a/vpid/bbc_radio_three

may return media bitrate=128 but the real bitrate of the stream is 
320kbps@44.1kHz.

(you can check the stream in an audio player - I used Winamp  VLC).
IIUIC, the code would declare all streams as being shoutcastaacstd.
Now the situation is quite different for overseas IPs (yes, the beeb does 
offer

Shoutcast streams internationally...);

When I try the BBC Radio 1 ms5 URL above from my non-UK IP, this is what I 
get:


media bitrate=128 encoding=aac kind=audio 
service=pc_stream_audio_simulcast_nonuk_a_lm_p010 
type=audio/x-scplsconnection authExpires=2014-12-13T05:16:52+00:00 
authExpiresOffset=6516 
href=http://bbcmedia.ic.llnwd.net/stream/bbcmedia_intl_lc_radio1_p?s=1418434096e=1418448496h=b83f3eace614bf5e621a6cf9911e83c6; 
priority=5 protocol=http supplier=ll_icy/connection 
authExpires=2014-12-13T05:06:13+00:00 authExpiresOffset=5877 
href=http://bbcmedia.ic.llnwd.net/stream/bbcmedia_intl_lc_radio1_q?s=1418434096e=1418448496h=2fdb80f2ac297da7bd0d147aa032eb6f; 
priority=10 protocol=http supplier=ll_icy2//media


Again, media bitrate=128 is MISLEADING, since the Int'l shoutcast streams
for all National Radios (Radio 3 included) are 56kbps@32kHz
(you can try the intl stream yourself - it even works without the 
auth-token).


But THERE EXIST two more shoutcast_mediasets:

$shoutcast_mediaset = 'http-icy-aac-lc-b'

This one ONLY WORKS for UK IPs, revealing
56kbps@32kHz streams for all National Radios
(identical specswise to the overseas streams, but
different to them):

http://open.live.bbc.co.uk/mediaselector/5/select/version/2.0/mediaset/http-icy-aac-lc-b/vpid/bbc_radio_three

where the statement media bitrate=56 is indeed true!
(when tried from a non-UK IP, you get:
error id=geolocation/ )

What shoutcastradiomode would your code assign to these streams?

$shoutcast_mediaset = 'http-icy-he-aacv2-a'

This third and final one works the same for UK and non-UK IPs,
producing data for Shoutcast streams that are 48kbpsHE-AACv2@44.1kHz
(these are different streams for UK  overseas):

http://open.live.bbc.co.uk/mediaselector/5/select/version/2.0/mediaset/http-icy-he-aacv2-a/vpid/bbc_radio_one

What are your thoughts on adding support for these additional 
shoutcast_mediasets?

And I don't know if it's the same thing,
but Winamp reports the streaming servers as being Limecast 2.0.0 -
is this a Limelight server using the Shoutcast protocol?


@@ -10151,6 +10188,183 @@ sub get {
(snip)
+package Streamer::shoutcast;


What I currently do for recording these streams is:
1. Download via browser and save this pls file:
http://open.live.bbc.co.uk/mediaselector/5/select/version/2.0/mediaset/http-icy-aac-lc-a/vpid/bbc_radio_one/format/pls.pls
2. Open in an editor  copy the href value
(I usually copy the href value of supplier=ll_icy2;
this is a backup stream not used very much by clients
and less prone to breakage...)
3. Use ffmpeg to dump:
ffmpeg -i 
http://bbcmedia.ic.llnwd.net/stream/bbcmedia_intl_lc_radio1_p; -c:a 
copy -bsf:a aac_adtstoasc BBC Radio 1 Live.m4a

Does your code do pretty much the same?


+   # Convert aac to aac/mp4a/mp3
(snip)
+   if ( $opt-{aactomp3} ) {


Would you consider transcoding in real-time?
If I record a 2 hour live programme, why wait an
additional time (especially on low end machines)
for the transcoding to complete?
For the live rtmp streams we have to also call
FFmpeg for on-the-fly

Re: Support for live radio Shoutcast streams

2014-12-12 Thread Vangelis forthnet 

Now that I remembered,

http://www.bbc.co.uk/blogs/internet/posts/BBC-Radio-to-stop-supporting-Windows-Media-on-December-31st


We will provide a SHOUTcast mp3 stream of all our radio stations
so that live radio will continue to work on internet radio devices
for another year or two.
This mp3 stream will be up and running before support
for Windows Media is switched off.


Has anyone been able to find more info on this/sniff any of those streams?
Or is it still too soon?

V. 



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