Icecast - May 2011 - Fwd: Random "fast forward" noise between tracks

Hello all,

I have subscribed to this list hoping I might find someone who can
suggest a fix for a problem I'm experiencing with Icecast (or possibly
something else in my setup).

Here is my configuration:

Foobar2000 is running on a Windows XP PC.   It has the Oddcast plugin
and it is streaming to a Linux machine that is running Icecast Server
2.3.2.  Foobar2000 is using the Crossfade, Compressor and Advanced
Limiter DSP plugins on top of the edCast plugin.

The problem:

Seemingly at random, in between tracks, there is a "fast forward"
noise
like a tape being played on fast forward.  It sounds like the next track
is being played at about ten times normal speed, then the next track
after that plays normally.

Has anyone heard of this problem?

Thanks,

Josh

-- 
--
"Everyone is a genius but if you judge a fish by its ability to climb a
tree it will spend its whole life believing it is stupid." - Albert
Einstein

On Sun, 8 May 2011, josh at thepruitts.org wrote:
> Foobar2000 is running on a Windows XP PC.   It has the Oddcast plugin
> and it is streaming to a Linux machine that is running Icecast Server
> 2.3.2.  Foobar2000 is using the Crossfade, Compressor and Advanced
> Limiter DSP plugins on top of the edCast plugin.
Just checking -- are these plugins *before* Edcast in the chain of 
plugins?  If they're not, they won't have any effect.
> Seemingly at random, in between tracks, there is a "fast forward"
noise
> like a tape being played on fast forward.  It sounds like the next track
> is being played at about ten times normal speed, then the next track
> after that plays normally.
Does it sound like this in yoru player or only on the stream?
> Has anyone heard of this problem?
It sounds like the MP3 data is being sent straight through to Icecast 
without being reencoded, which is of course not what you want.  This 
should only happen ifthere are files with differing sample rates or 
possibly different bitrates.  MP3 isn't really intended to deal with this. 
But as I say, it should be being reencoded after it goes through your 
other plugins.

I'm not very familiar with Foobar 2000 so can't comment on the specifics
of your setup.  Maybe someone else can.

Geoff.

On 05/09/2011 01:28 PM, Geoff Shang wrote:
> On Sun, 8 May 2011, josh at thepruitts.org wrote:
>
>> Foobar2000 is running on a Windows XP PC.   It has the Oddcast plugin
>> and it is streaming to a Linux machine that is running Icecast Server
>> 2.3.2.  Foobar2000 is using the Crossfade, Compressor and Advanced
>> Limiter DSP plugins on top of the edCast plugin.
> Just checking -- are these plugins *before* Edcast in the chain of
> plugins?  If they're not, they won't have any effect.
>
They are all before Edcast.
>> Seemingly at random, in between tracks, there is a "fast
forward" noise
>> like a tape being played on fast forward.  It sounds like the next
track
>> is being played at about ten times normal speed, then the next track
>> after that plays normally.
> Does it sound like this in yoru player or only on the stream?
>
I'm not certain, there's no sound output device on the client machine.  
DSP is set to null output.
>> Has anyone heard of this problem?
> It sounds like the MP3 data is being sent straight through to Icecast
> without being reencoded, which is of course not what you want.  This
> should only happen ifthere are files with differing sample rates or
> possibly different bitrates.  MP3 isn't really intended to deal with
this.
> But as I say, it should be being reencoded after it goes through your
> other plugins.
I have identified the problem.

It is caused by the crossfade plugin in Foobar2000.  When it tries to 
crossfade two MP3's of different bit rates it uses the bit rate of the 
file that is fading out, regardless of the bit rate of the file that is 
fading in.

Thanks for your help, Geoff.
> I'm not very familiar with Foobar 2000 so can't comment on the
specifics
> of your setup.  Maybe someone else can.
>
> Geoff.
>
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-- 
--
"Everyone is a genius but if you judge a fish by its ability to climb a
tree it will spend its whole life believing it is stupid." - Albert
Einstein