Icecast - Sep 2004 - Sample Rates

Hi there -

 

I am currently in the middle of a project where I need to configure an
Icecast Server and I am using Ices as the encoder.  I want to configure Ices
to take in a stream with a sample rate of 128 kHz and output it to the
Icecast server.  My question is, what are the minimum and maximum sample
rates that Ices will continue to work with? 

 

Thank you,

 

Heidi Young

Software Developer

SAIC - Sea Technology and Services Division

1007 Scott Ave. Suite A

Bremerton, WA 98310

(360) 415-5768

 

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Young, Heidi A. wrote:
> I am currently in the middle of a project where I need to configure an
> Icecast Server and I am using Ices as the encoder.  I want to configure
Ices
> to take in a stream with a sample rate of 128 kHz and output it to the
> Icecast server.  My question is, what are the minimum and maximum sample
> rates that Ices will continue to work with?
Are you sure it's 128kHz?  This is a rather odd sampling rate.  I've 
personally never come across anything between 96kHz and 192kHz (rates tend 
to be a multiple of 44.1kHz or 48kHz, and 128 is neither).  What audio 
source is this (am curious)?

Geoff.

On Sep 2, 2004, at 11:15 PM, Geoff Shang wrote:
> Young, Heidi A. wrote:
>
>> I am currently in the middle of a project where I need to configure an
>> Icecast Server and I am using Ices as the encoder.  I want to 
>> configure Ices
>> to take in a stream with a sample rate of 128 kHz and output it to the
>> Icecast server.  My question is, what are the minimum and maximum 
>> sample
>> rates that Ices will continue to work with?
>
> Are you sure it's 128kHz?  This is a rather odd sampling rate. 
I've
> personally never come across anything between 96kHz and 192kHz (rates 
> tend to be a multiple of 44.1kHz or 48kHz, and 128 is neither).  What 
> audio source is this (am curious)?
She obviously has "sample rate" confused with "bit rate"

/dale

On Tue, 31 Aug 2004 16:23:53 -0700, Young, Heidi A. wrote:
> Hi there -
> 
>  
> 
> I am currently in the middle of a project where I need to configure an
> Icecast Server and I am using Ices as the encoder.  I want to configure
Ices
> to take in a stream with a sample rate of 128 kHz and output it to the
> Icecast server.  My question is, what are the minimum and maximum sample
> rates that Ices will continue to work with? 
> 
>  
> 
> Thank you,
> 
>  
> 
> Heidi Young
> 
> Software Developer
> 
> SAIC - Sea Technology and Services Division
> 
> 1007 Scott Ave. Suite A
> 
> Bremerton, WA 98310
> 
> (360) 415-5768
I've managed to get it down to a bitrate (not sample rate) of about 20-22
kbit/s mono using a config file like this (change the input section to
suit your setup). I don't know what the max bitrate is, but probably not
much point going much above 128 kbit/s stereo, as the quality at that rate
is pretty good.

<?xml version="1.0"?>
<ices>

        <background>0</background> <!-- run in background?
(unimplemented) -->
        <logpath>/tmp</logpath> <!-- where logs, etc go. -->
        <logfile>ices.log</logfile>
        <loglevel>4</loglevel> <!-- 1=error,2=warn,3=info,4=debug
-->
    <logsize>2048</logsize> <!-- the size the log file must be
before rotation -->
    <consolelog>0</consolelog> <!-- set this to 1 to log to the
console instead
                                    of to the file above -->
    <pidfile>/var/ices/ices.pid</pidfile> <!-- file to write
process id to -->

        <stream>

                <!-- input module -->
                <input>
                        <module>jack</module>
                        <param name="channels">1</param>
                        <param
name="clientname">ices32</param>
                </input>

        <runner>
            <!-- Stream instance -->
            <instance>
                <shout>
                    <!-- Server details: -->
                    <hostname>localhost</hostname>
                    <port>8000</port>
                    <password>hackme</password>
                    <mount>/mono.ogg</mount>

                    <reconnectdelay>2</reconnectdelay>
                    <reconnectattempts>5</reconnectattempts>
                </shout>

                <resample>
                    <out-rate>22050</out-rate>
                    </resample>
                <encode>
                    <!-- VBR mode can be selected via quality or
nominal-bitrate -->
                    <!-- selecting enabling managed has to be done separately
as -->
                    <!-- it's slower, but can be used to limit a high
threshold -->
                    <managed>1</managed>
                    <maximum-bitrate>22000</maximum-bitrate>
                    <nominal-bitrate>22000</nominal-bitrate>
                </encode>
            </instance>
        </runner>
        </stream>
</ices>