[Voyage-linux] Max CPU with mpd's httpd streaming server

[Kim-man 'Punky' TSE]

Hi Norman,

I tried http streaming even before voyage mpd is announced.  ALIX is underpower and cannot fit http streaming purpose.  
If you define bitrate it is even worse.  It is better if you set quality instead of bitrate in your configuration below, 
but you would still expect some skips.    In addition, change from stereo to mono makes CPU consume less, i.e. format = 
"44100:16:1".

May be you can try icecast to see if it gets better...

Regards,
Punky

On 11/26/2010 5:03 PM, Norman Henderson wrote:
> Hi, I have a Voyage 0.6.5 system on which I run a number of different things including mpd. It works fine for playback 
> through the ALSA device (headphone jack) with about 15% CPU use. However when I set up an httpd output and connect to 
> it from my laptop (with the browser or with VLC, etc.) CPU immediately goes to almost 100% and the playback starts to 
> skip (both through the ALSA and through the laptop).
>
> At first I thought this was because I was streaming vorbis and the music files (which are on a local USB drive) are 
> mp3. So with some pain I compiled mpd 0.15.15 with lame support and got that working. However my high CPU problem is 
> still there. I believe the output matches the file format so there shouldn't be any resampling (but I don't know a lot 
> about this stuff):
>
> audio_output {
>         type            "httpd"
>         name            "Voyage HTTP Stream"
>         encoder         "lame"          # optional, vorbis or lame
>         port            "8000"
> #       quality         "5.0"                   # do not define if bitrate is defined
>         bitrate         "192"                    # do not define if quality is defined
>         format          "44100:16:2"
> }
> Incidentally results were the same with the default bitrate 128, or with 96, and with 1 instead of 2 channels in the 
> format.
>
> The system also has a Samba server running and if I use e.g. VLC on my laptop to just play the files from the network 
> share that's fine too, no skipping and normal CPU usage - so I don't think it's a networking issue.
>
> Any suggestions? Does the new Voyage MPD build support playback of mp3's over mpd's built-in httpd streaming server 
> without problems, and is there anything special about the configuration?
> - Norm
>
>
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-- 
Regards,
Punky

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