[Icecast] Best way to handle multiple (6+) streams
andy at earthsong.free-online.co.uk
Sat May 21 12:08:08 PDT 2005
On Thursday 19 May 2005 04:02, Seth McTigh wrote:
> I have a need to stream 6 or 8 different audio sources (radios), and am
> seeking suggestions on the best way to do it. Although I'd like to stream
> each separately, I could combine them to stereo streams and do 2 on each.
Sounds like a bad idea - you'd get cross-talk between the two channels.
> I'd like to know what the best hardware configuration would be to
> accomplish this? Are there any multiple input sound cards that have been
> successfully tested, or will I need to run 6 or 8 separate boxes to stream
> into a main server?
> Is it possible to configure 4 sound cards in a single computer?
Yes if you have the slots, but a single multi-input card would be better.
> Any suggestions/pointers would be greatly appreciated.
One point is if you want to encode 6-8 streams on a single machine, you'll
probably need a pretty fast machine, as encoding is quite
processor-intensive. As an example, I just encoded a 4 minute, 34 second
track in 40 seconds using oggenc at 64 kbps on a 1.4 GHz athlon, which means
that streaming live audio the encoder would use around 100*40/(4*60+34)=14.5%
of the CPU. I.e. you'd run out of CPU trying to encode more than 5-6 streams
at that bitrate on this machine.
You can do this test yourself on the machine you'll be using like this:
$ oggenc -b 64 track.wav -o track.ogg
Opening with wav module: WAV file reader
Encoding "track.wav" to
at approximate bitrate 64 kbps (VBR encoding enabled)
[ 99.9%] [ 0m00s remaining] /
Done encoding file "track.ogg"
File length: 4m 34.0s
Elapsed time: 0m 40.3s
Average bitrate: 66.7 kb/s
Then look for the 'rate' parameter in the results - this is the number of
times faster than real time the track encoded in, which should roughly
translate to the maximum number of live streams you can encode at once.
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