[Icecast] Bandwidth Usage

Keith Roberts keith at karsites.net
Mon Oct 14 18:07:51 UTC 2013

On Mon, 14 Oct 2013, Basil Mohamed Gohar wrote:

> To: icecast at xiph.org
> From: Basil Mohamed Gohar <basilgohar at librevideo.org>
> Subject: Re: [Icecast] Bandwidth Usage
> On 10/14/2013 12:42 PM, Keith Roberts wrote:
>> If there is no sound input on the client audio stream being
>> sent to the icecast server does this mean there is no
>> bandwidth being used - or does icecast use bandwidth even
>> for times when there is no sound on the client input end?
>> Kind Regards,
>> Keith Roberts
> That all depends on the method of encoding being used on the
> input/source side.  If you are using a VBR (variable bitrate) method,
> such as the default/recommended encoding method for Ogg Vorbis, the
> bitrate will be much less during these silent parts.
> Alternatively, if you're using a CBR (constant bitrate), the bandwidth
> will be nearly constant regardless of level of sound input, even during
> silent segments.
> Neither of these modes have anything to do with Icecast itself, but
> rather, everything to do with your stream source.

OK thanks for that advice Mohamed. So it will be line input 
audio sine wave into the soundcard, and then use the 
default VBR to encode the stream to OggV and stream that up 
to the icecast server?




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