Hi,
I just adapted shine so that it can be used with Liquidsoap. You can get it
on the "shine" directory on the mercurial. Then, you can use it as follows:
output.file(%external(channels=2,samplerate=44100,header=true,process="/PATH/TO/shineenc
- -"), "test.mp3", source)
and it can be used in a similar way in output.icecast, etc. It would be
nice if someone with a raspberry could test if it produces decent results
(cpu and sound quality) on a raspberry pi!...
++
Sam.
On Mon, Jul 16, 2012 at 8:20 PM, Romain Beauxis <to...@rastageeks.org>wrote:
> Hi Anthony!
>
> 2012/7/16 Anthony Williams <anth...@ury.york.ac.uk>:
> > I tried this with liquidsoap-1.0.0 and 1.0.1 on a raspberry pi running
> > Debian Squeeze. Dependencies, where required, were installed through
> > debian repos.
> >
> > I tried streaming a 64k mono mp3 using sine() as the input source to an
> > icecast server. CPU was maxed at 95-100%, and the log was filled with
> > "We must catchup x seconds!" until it restarted at 60 seconds. So it
> > looks like that won't work, the CPU isn't powerful enough.
> >
> > To expand a little on Romain Bauxis' earlier post:
> >
> > Encoding with vorbis worked, but only with a quality of 0.1, in mono,
> > sample rate of 16khz, with CPU utilisation of 90%, after spending about
> > 15 seconds 'catching up' once the stream was started. So no good for
> > decent sound quality.
> >
> > Encoding using %wav used far less CPU time and the stream stayed up, but
> > I couldn't open it, with vlc giving an error of Header missing (It
> > played fine when the script was run from a desktop). Perhaps a
> > configuration error on my part? (I did have trouble make installing).
> >
> > Encoding with flac worked well, with 50% CPU utilisation in mono and 8
> > bits per sample, increased to 85% usage in stereo, 16 bits per sample.
> > 44khz, compression 5 for both those tests.
> >
> > These were not tested for any great length of time. (Less than 10
> minutes)
> >
> >
> > MP3 icecast streams play fine. I have had it set up playing a 192kbps
> > MP3 icecast stream out of a USB sound card for several hour stretches at
> > around 40% CPU utilisation (I was having difficulties with the internal
> > sound hardware, it kept suffering underrun after an hour or so, as did
> > mplayer).
> >
> > I help out at a student radio station, where we had the idea of using
> > Raspberry Pi's in campus bars to play our online stream, so the RPi +
> > liquidsoap is looking promising from this point!
> >
> > Hope this helps
>
> Thanks for this detailed review!
>
> As for encoding, I'd like to stress that the absence on a FPU
> (floating point processing unit) on the board is the real tipping
> point.
>
> The reasons is that all operations on floats have to be emulated by
> the CPU. Thus, we're talking about a whole different magnitude. It's
> very likely that mp3 encoding will not be possible at any rate until a
> fixed-point encoder is implemented...
>
> As for decoding, most decoders such as MAD are already fixed-point,
> which is why they work..
>
> Romain
>
>
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