Hi!
2017-01-06 5:31 GMT-06:00 Attila Györffy <[email protected]>:
> Hi Everyone,
>
> I'm trying to set up liquidsoap with a input.harbor and a safe (local
> playlist) input. One is for live sources, the other one is basically a
> fallback.
>
> To ensure both sources sound quite similar, I’d like to run them through
> stereotool and then provide MP3 and AAC+ streams for either shoutcast v2
or
> icecast2. To encode to AAC format, I’d like to use the Fraunhofer FDK AAC
> code, that is (according to my research) produces the best audio quality
on
> the bitrate I’m interested in (currently 64 or 96 kbps, not yet decided).
>
> I have a problem however where I need to take the input, pass it through
an
> external encoder for processing and then convert it back to AAC. I did try
> the following:
>
> #-----
>
> # Receives stream from a NiceCast broadcaster, probably MP3
> live = input.harbor("test-harbor", port=8080, password="testing",
> buffer=30.,max=60.)
>
> # Default, fail-safe fallback with a single track
> default = mksafe(single("/etc/liquidsoap/fallback.mp3"))
>
> # Stream with fallback
> radio = fallback(track_sensitive=false, [ live, default ])
>
> # Try the external FDKAAC encoder to be able to take the stereotool
output.
> # This won't work however because fdk-aac cannot produce raw AAC, just M4A
> # and that is not compatible with streaming, therefore fdk-aac won't
stream
> # to stdout.
> external_encoder = %external(samplerate=44100, channels=2, header=false,
> restart_on_crash=true, process="/usr/local/bin/stereotool - - -s
> /etc/stereotool/myradio.sts -q | /usr/bin/fdkaac --profile 29 --bitrate
128
> - -", video=false)
>
> # ShoutCast output example
> output.shoutcast(external_encoder, format="audio/aacp", host="localhost",
> port=8000, password="testing", radio)
>
>
> #-----
>
> However this did not work because of the comments mentioned above (M4A
> format cannot be streamed). I’ve seen that liqudisoap 1.2.1 comes with a
> pipe operator and if I understand correctly, this may be the solution for
my
> problem? You see, the only reason I included the fdk-aac command line tool
> is because I have no idea how to use the built-in %fdkaac option with an
> external encoder.
>
> How does one do this? I’d love an example please,
You should try something like this:
# Receives stream from a NiceCast broadcaster, probably MP3
live = input.harbor("test-harbor", port=8080, password="testing",
buffer=30.,max=60.)
# Default, fail-safe fallback with a single track
default = mksafe(single("/etc/liquidsoap/fallback.mp3"))
# Stream with fallback
radio = fallback(track_sensitive=false, [ live, default ])
# Pipe through processing application
radio = pipe(process="/usr/local/bin/stereotool - - -s
/etc/stereotool/myradio.sts -q", radio)
# Output using the internal %fdkaac encoder
output.shoutcast(%fdkaac, host="localhost", port=8000, password="testing",
radio)
> Thank you for your hard work and have a great new year,
Same to you!
Romain
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