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

[Norman Henderson]

My apologies, scrap that question - you already suggested icecast and after
researching that, and ices, it's probably exactly what I'm looking for. I
don't have it working yet but I'm well on the way.

On Fri, Nov 26, 2010 at 14:14, Norman Henderson <norm.audrey at gmail.com>wrote:

> Reducing the format from 44100:16:1 to e.g. 16000:16:1 made it worse. The
> "quality" parameter has no apparent effect, one posting I saw suggests it's
> specific to Vorbis and may not apply to LAME.
>
> What I found works (about 40% CPU, no skipping) is 44100:16:1 and a very
> low bitrate (16). Poor quality audio of course but...
>
> Actually I think I'm using the wrong tool here. What I really want to do,
> is to take monoaural audio from a ham radio receiver, feed it in the Mic
> jack of the Alix, and stream it to my PC over the LAN. Can you suggest an
> approach? This is a new area for me.
>
> Thanks, Norm
>
>
> On Fri, Nov 26, 2010 at 09:39, Norman Henderson <norm.audrey at gmail.com>wrote:
>
>> Thanks for the quick reply, I was afraid that was the problem! I'll try
>> tweaking the quality though.
>>
>>
>> On Fri, Nov 26, 2010 at 09:22, Kim-man 'Punky' TSE <punkytse at punknix.com>wrote:
>>
>>> 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
>>>>
>>>>
>>>> _______________________________________________
>>>> Voyage-linux mailing list
>>>> Voyage-linux at list.voyage.hk
>>>> http://list.voyage.hk/mailman/listinfo/voyage-linux
>>>>
>>>
>>>
>>> --
>>> Regards,
>>> Punky
>>>
>>> Voyage Solutions (http://solution.voyage.hk)
>>> * Embedded Solutions and Systems
>>>  - Mesh Networking, Captive Portal, IP Surveillance, VoIP/PBX
>>>  - Network Engineering, Development Platform and Consultation
>>>
>>>
>>>
>>>
>>
>
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