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View Full Version : First Surround 5.1 Webradio !



deadwood
2007-07-13, 09:11
In association with Zenon-Media and the Fraunhofer Institute of Erlangen, French Broadcaster Radio Classique has launched at NAB 2007 in Las Vegas a streamed surround 5.1 Webradio.

Stream URL ==> http://str2.creacast.com:86/
And for those who read french : http://www.radioclassique.fr/index.php?id=143

Despite the streaming is correctly handled by Winamp with or without the winamp 5.1 plugin, the squeezebox is unable to open the stream, I'm running the latest slimserver build...

If you can give it a try and let us know...

Thanks !

andyg
2007-07-13, 09:19
5.1 MP3? I'm surprised that you are surprised it doesn't work on your Squeezebox, since mp3 does not support any more than 2 channels. :) Also, the SB is only a 2-channel device, in order to do something like this we'd need a Dolby Digital encoder to send 5.1 on the digital out?!

deadwood
2007-07-13, 09:46
Hi Andy,

From the streaming info the radio is broadcasted in content type MP3S. However even if the SB is a 2 channel media it should be able to open the stream as the stream is claimed compatible with any other players...

Quote from Zenon-Media :

Zenon-Media joined the Fraunhofer Institut of Erlangen to launch for the NAB exhibition as a world innovation a surround 5.1 stream based on the MP3 SX technology. The stream is compatible with all standard mp3 players and can be listened from everybody.

They claimed...

Anyway thanks for your enlightning.

Cheers !

andyg
2007-07-13, 09:46
Actually, it will play but because of the content-type audio/mp3s you need to edit types.conf to add this to the mp3 line.

andyg
2007-07-13, 09:52
I've checked in support for audio/mp3s.

andyg
2007-07-13, 10:02
This is a pretty nice stream actually, 192k too. I do hear some audio glitches every once in a while, maybe this is from the extra surround data? It also needs better formatted title metadata. :)

deadwood
2007-07-13, 10:46
Yeah, I've got the same here, some glitches but the program is really nice with a mix of classical and movie soundtrack...

Thanks Andy It worked all right now after editing types.conf, it took me a little long my server is on ...Mac, it wasnot easy to find the file...

Now my output is Dolby Prologic on 5 channels, the SB SPDIF output goes from the SB to an audio/video HUB, I guess conversion are ongoing all thru, but the restitution is fantastic (actually my Hub is a high end Bang Olufsen device, it helps :)

Regarding the AC3 decoding in the SB, could this be only achieved with a 'hardware' upgrade or with a soft/firmware update ?

Anyways thanks a lot for your help. The Squeezebox is a top notch device and I will never give it up !

andyg
2007-07-13, 10:53
AC3 was a bit of a joke, we won't really be doing that. :) In theory, you could have a server-side process take the mp3, transcode it to AC3, and send through the Squeezebox the same way AC3 files are played now.

Mark Lanctot
2007-07-13, 10:56
Now my output is Dolby Prologic on 5 channels

Note that you can apply Pro-Logic to any 2-channel source, so this mode wasn't necessarily triggered by the stream.

You may want to search on this forum regarding Dolby Digital pass-through. There are some solutions but unfortunately the file must be specially processed.

How are these steams encoded in 5.1? Are there phase cues embedded in the regular 2-channel stream (aka Dolby Surround), is it Dolby Digital or is is some special 5-channel MP3? If it's Dolby Surround then yes, if you play it back in PL/PLII you can recover the surround information.

andyg
2007-07-13, 10:59
More info: http://www.iis.fraunhofer.de/EN/bf/amm/mp3sur/index.jsp

It does sound similar to Prologic.

Mark Lanctot
2007-07-13, 11:07
More info: http://www.iis.fraunhofer.de/EN/bf/amm/mp3sur/index.jsp

It does sound similar to Prologic.

Could be - although they're light on the specifics, they do say:


MP3 Surround enables high-quality surround sound at bit rates comparable to those currently used to encode stereo MP3 material.

If it can be done at "comparable" bitrates then they can't possibly be including additional full-frequency channels.

However if it was merely phase cues then the bitrate would be identical since these modifications can be accomplished in the analog domain and data isn't added. merely modified.

Philip Meyer
2007-07-15, 03:33
>In association with Zenon-Media and the Fraunhofer Institute of
>Erlangen, French Broadcaster Radio Classique has launched at NAB 2007
>in Las Vegas a streamed surround 5.1 Webradio.
>
>Stream URL ==> http://str2.creacast.com:86/
>
I tried this out. Although I can playback the stream through my surround sound amp via the SqueezeBox, it's only playing back in stereo. Is this expected? I guess either SlimServer does some processing on the stream, or the surround amp doesn't understand the format.

Phil

kkitts
2007-07-15, 09:50
I created a 5.1 wav file through a painful laborious process - and played it back through the squeezebox. I'm certain that it picked up 5.1 channels because I can verify that on my yamaha receiver. So squeezebox *can* play back 5.1 files of some varieties - is that right? BTW, I am using the optical out to the from the SB to the yamaha receiver.


5.1 MP3? I'm surprised that you are surprised it doesn't work on your Squeezebox, since mp3 does not support any more than 2 channels. :) Also, the SB is only a 2-channel device, in order to do something like this we'd need a Dolby Digital encoder to send 5.1 on the digital out?!

smst
2007-07-23, 01:44
I created a 5.1 wav file through a painful laborious process - and played it back through the squeezebox. I'm certain that it picked up 5.1 channels because I can verify that on my yamaha receiver. So squeezebox *can* play back 5.1 files of some varieties - is that right? BTW, I am using the optical out to the from the SB to the yamaha receiver.

The SB2 and SB3 can play back WAV files, and (if you've got a fixed digital output level and no MP3 transcoding) will pass the exact contents of the WAV file over S/PDIF to your receiver. The SB2/3 itself knows nothing about surround sound formats (and it's only got stereo analogue output, so it couldn't do anything with the extra channels anyway).

What sort of WAV did you create? Both Dolby Digital (AC3) and DTS can be wrapped in a WAV format, and the SB2/3 will pass them straight through to your receiver: if it understands AC3 or DTS, it will play them back.

Cintra
2009-03-21, 12:31
Just came across this thread and as I had just this evening installed the Fraunhofer MP3 Surround player on my iMac I gave http://str2.creacast.com:86/ a spin and its working really well here in Norway :)