Icecast - Sep 2014 - can I convert ogg to mp3 streaming on fly?

Hello,
I am configuring a webradio and I'm using icecast2 with deefuzzer.
the music streaming work, in mp3 format.
I want to make a second streaming with my iphone, and the app that I'm 
using, Koalasan,  can stream only in OGG, AAC or Opus.
I want that when I start speaking, music stops and my voice is online.
Deefuzzer is able to do this with "relay", but the original stream in 
mp3, and the stream from my iphone is in ogg.
do you know if I can convert the ogg streaming to mp3 and then pass it 
to icecast?
is it possible?
thank you.

On 09/29/2014 02:35 PM, Simone Dal Maso wrote:
> Hello,
> I am configuring a webradio and I'm using icecast2 with deefuzzer.
> the music streaming work, in mp3 format.
> I want to make a second streaming with my iphone, and the app that I'm 
> using, Koalasan,  can stream only in OGG, AAC or Opus.
I'd go for Opus. Best quality for the bit-rate.
> I want that when I start speaking, music stops and my voice is online.
> Deefuzzer is able to do this with "relay", but the original
stream in
> mp3, and the stream from my iphone is in ogg.
> do you know if I can convert the ogg streaming to mp3 and then pass it 
> to icecast?
You could use an on-connect hook on /highquality.opus to start a
re-encoder that then sends this to /lowquality.mp3. If /lowquality.mp3
has a fallback, with override, of /lowquality-background.mp3, then all
will happen like magic.
When disconnecting, I'd use the on-disconnect hook to kill the transcoder.

You can use liquidsoap, streamtranscoder, gstreamer, vlc or one of the
other clients for this.

Cheers

Thomas