22 Mar
2016
22 Mar
'16
3:53 p.m.
I'm looking to setup something to take multiple inputs from a audio interface (say 8
channels) and then encode those inputs to several (MP3?) streams and send them to a
icecast server for distribution.
I've used darkice/icecast on the same system with the built-in sound card (2 inputs),
and now I want to ramp that up to say 8 inputs / streams.
I'd prefer this to be as close to real-time as possible, and all CLI/scriptable.
Any thoughts?
22 Mar
22 Mar
4:35 p.m.
On 03/22/2016 03:53 PM, James Greenlee wrote:
I'm looking to setup something to take multiple
inputs from a audio interface (say 8 channels) and then encode those inputs to several
(MP3?) streams and send them to a icecast server for distribution.
I've used darkice/icecast on the same system with the built-in sound card (2 inputs),
and now I want to ramp that up to say 8 inputs / streams.
Maybe have a closer look at ffmpeg/avconv or gstreamer?
ffmpeg can grab input devices and do all kinds of stuff with the streams.
I'd prefer this to be as close to real-time as
possible
What is that supposed to mean?
5:06 p.m.
I'll check out ffmpeg and gstreamer.
Audio encoding/decoding takes time (latency). Perhaps I should have said
"low-latency." So what I want is a low-latency audio encoding/streaming
system.
----- Original Message -----
From: "Markus Seeber" <markus.seeber(a)spectralbird.de>
To: linux-audio-user(a)lists.linuxaudio.org
Sent: Tuesday, March 22, 2016 11:27:00 AM
Subject: Re: [LAU] Multi-input streaming
On 03/22/2016 03:53 PM, James Greenlee wrote:
I'm looking to setup something to take multiple
inputs from a audio interface (say 8 channels) and then encode those inputs to several
(MP3?) streams and send them to a icecast server for distribution.
I've used darkice/icecast on the same system with the built-in sound card (2 inputs),
and now I want to ramp that up to say 8 inputs / streams.
Maybe have a closer look at ffmpeg/avconv or gstreamer?
ffmpeg can grab input devices and do all kinds of stuff with the streams.
I'd prefer this to be as close to real-time as
possible
What is that supposed to mean?
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Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
8:39 p.m.
On 22.03.2016 17:06, James Greenlee wrote:
I'll check out ffmpeg and gstreamer.
Audio encoding/decoding takes time (latency). Perhaps I should have said
"low-latency." So what I want is a low-latency audio encoding/streaming
system.
Here's one solution that works using icecast:
gst-launch-1.0 jackaudiosrc connect=0 ! audio/x-raw,channels=8 !
vorbisenc ! webmmux ! shout2send ip=HOSTNAME port=12000
password=PASSWORD mount=/8ch.webm
Currently, opus in gstreamer doesn't support more than two channels, but
opus should have a lower latency (and quality per bits) than vorbis.
Of course you are right that audio encoding introduces latency.
Additionally you have two TCP connections (sender -> icecast and icecast
-> receiver) which introduce latency. Furthermore, icecast buffers every
stream (configurable) but icecast cannot be used for low-latency audio
distribution.
If you want a low-latency system, you have a fast, low-latency network
(i.e. not "the internet") and you have control over both sender and
receiver, netjack is the best solution
(http://jackaudio.org/faq/netjack.html and
https://github.com/jackaudio/jackaudio.github.com/wiki/WalkThrough_User_Net…)
Best regards,
Jannis
----- Original Message -----
From: "Markus Seeber" <markus.seeber(a)spectralbird.de>
To: linux-audio-user(a)lists.linuxaudio.org
Sent: Tuesday, March 22, 2016 11:27:00 AM
Subject: Re: [LAU] Multi-input streaming
On 03/22/2016 03:53 PM, James Greenlee wrote:
I'm looking to setup something to take
multiple inputs from a audio interface (say 8 channels) and then encode those inputs to
several (MP3?) streams and send them to a icecast server for distribution.
I've used darkice/icecast on the same system with the built-in sound card (2 inputs),
and now I want to ramp that up to say 8 inputs / streams.
Maybe have a closer look at ffmpeg/avconv or gstreamer?
ffmpeg can grab input devices and do all kinds of stuff with the streams.
I'd prefer this to be as close to real-time
as possible
What is that supposed to mean?
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
4:59 p.m.
On 03/22/2016 03:53 PM, James Greenlee wrote:
I'm looking to setup something to take multiple
inputs from a audio
interface (say 8 channels) and then encode those inputs to several
(MP3?) streams and send them to a icecast server for distribution.
I've used darkice/icecast on the same system with the built-in sound
card (2 inputs), and now I want to ramp that up to say 8 inputs /
streams.
I'd prefer this to be as close to real-time as possible, and all
CLI/scriptable.
Any thoughts?
Use JACK. Then use a JACK-capable stream source such as ezstream or
ices. No upper limits on the number of streams.
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
9:03 p.m.
On Tue, 22 Mar 2016, James Greenlee wrote:
I'm looking to setup something to take multiple
inputs from a audio interface (say 8 channels) and then encode those inputs to several
(MP3?) streams and send them to a icecast server for distribution.
I've used darkice/icecast on the same system with the built-in sound card (2 inputs),
and now I want to ramp that up to say 8 inputs / streams.
I'd prefer this to be as close to real-time as possible, and all CLI/scriptable.
MP3, Real Time? MP3 adds something like 300ms latency. As comparison
skype's encoding is around 30ms. If you want anything close to realtime...
Opus is it. (Opus being completely open, the HTML5 standard are also good
reasons to use it over Mp3 propietary code)
--
Len Ovens
www.ovenwerks.net
3201
days inactive
3201
days old
linux-audio-user@lists.linuxaudio.org
5 comments
5 participants
participants (5)
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James Greenlee -
Jannis Achstetter -
Jörn Nettingsmeier -
Len Ovens -
Markus Seeber