Icecast - Jul 2021 - Need help with streaming multiple file types and bitrates

Hi,

I'm using Liquidsoap. I have some DJ mixes (originally from C90 tape) 
that vary in bitrate. I could have a separate mount point for each mix 
but want to create a radio station like format with each mix playing one 
after another (with a jingle between each one or over quiet parts). So 
is there a way of doing that; playing one mix after another, with 
bitrate varying sometimes, without transcoding ? Looking at it I don't 
think there is but thought I'd ask anyway.

Cheers

Michael

------ Original Message ------
From: "Lorenz Reichelt" <lr at pripple.de>
To: "Michael Z Freeman" <michael at michaelzfreeman.org>;
"Icecast
streaming server user discussions" <icecast at xiph.org>
Sent: 24/07/2021 19:45:02
Subject: Re: [Icecast] Need help with streaming multiple file types and 
bitrates
>Hi :) So running it all through ezstream and outputting a flac stream to
icecast is not your preferred option, is it? Just to clarify. How are you
streaming the files? Best

V?Sun, Jul 25, 2021 at 10:33:58AM +0000,?Michael Z Freeman
napsal(a):
> I'm using Liquidsoap. I have some DJ mixes (originally from C90 tape) 
> that vary in bitrate. I could have a separate mount point for each mix 
> but want to create a radio station like format with each mix playing one 
> after another (with a jingle between each one or over quiet parts). So 
> is there a way of doing that; playing one mix after another, with 
> bitrate varying sometimes, without transcoding ? Looking at it I don't 
> think there is but thought I'd ask anyway.
> 
It's rather a matter of the client than Icecast. Icecast blindy forwards
a bit stream. If your client can cope with a stream which changes bitrate
between MP3 frames, then you will be fine.

I just made a test: I created two files, one 32-bkps and another 128-kbps MP3
file. I setup ezstream-0.6.0 to stream them in a loop without reencoding into
an Icecast server, and used mpv (ffmpeg-based) and mpg123 (an independ MP3
decoder implementation) without any problems. I saved a stream reproducing
3 loops of the 2 files and verified that the stream size is roughly
equivalent to a tripple of a sum of the two file sizes. Hence indeed no
recoding was performed.

-- Petr
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