[Icecast] streaming to dialup users gives low quality audio

Klaas Jan Wierenga k.j.wierenga at home.nl
Fri Dec 30 11:30:56 PST 2005


There are two things that caught my attention in this post.

When you say 22050 kHz sampling rate, two channels and bitrate 24. Do you
mean 24 kbps stereo (which would be 12 kbps per channel, i.e. real bad audio
quality), or 48 kpbs stereo (24 kbps for each channel).

When you talk about dial-up, do you mean analog dial-up that is limited to
56 kbit/sec? In that case streaming at 48kbps is pushing it since many
dial-up connections won't reach that speed because of bad line quality. The
safest way to go is to stream in mono and don't push the bitrate beyond
24kbps or 32kbps if you really must.

KJ

-----Oorspronkelijk bericht-----
Van: icecast-bounces at xiph.org [mailto:icecast-bounces at xiph.org]Namens
Dave
Verzonden: vrijdag 30 december 2005 20:05
Aan: icecast at xiph.org
Onderwerp: [Icecast] streaming to dialup users gives low quality audio


Hello,
    I've got two streams, one for broadband, one for dialup. Well, having
had occation to use a dialup connection recently i checked the dialup
stream. Although it was streaming what the broadband stream was, the audio
quality was audibly worse. It didn't buffer, but it didn't sound as clear as
the broadband stream. I used lame to encode the tracks to mp3 and used it's
standard preset while doing it. In my ices.conf file for the dialup stream i
originally had a samplerate of 22050, two chanels, and a bitrate of 24. I
changed the bitrate up to 56, which resulted in a noticeable audio increase
in quality but the buffering was unacceptable. If anyone has settings that
work i would be interested in hearing about them.
Thanks.
Dave.

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