How to Broadcast to Icecast2 with ffmpeg¶

# SAMPLE: FLAC streaming on Windows & Mac

# Input device on Windows
# you should find DShow device name by:
#   ffmpeg.exe -list_devices true -f dshow -i dummy
input="dshow"
device="audio=@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{D50ABAB1-D542-4F19-BB77-D12FADCAB889}"

# Input device on macOS
# setup a default device at System Preferences > Sound > Input
# input="avfoundation"
# device="none:default"

channels=2

samplerate=48000

codec="flac"

# above 12 is not recommended
# if you have a slow hardware, set lower value.
level=10

while true
do
  ./ffmpeg -f $input \
         -i $device \
         -ar $samplerate \
         -ac $channels \
         -c:a $codec -compression_level $level \
         -f ogg \
         -content_type 'application/ogg' \
         icecast://source:PASSWORD@HOSTNAME:8001/STREAM_NAME
  sleep 1
done

# SAMPLE: encode to another formats

name=stream

# AACs
# AAC streams must be pushed as ADTS stream (-f adts)

# ==== HE-AAC (SBR+PS) @ CBR 48kbps ====
  -c:a libfdk_aac -profile:a aac_he_v2 -ab 48k
  -content_type 'audio/aac'
  -vn -f adts icecast://source:PASSWORD@icecast:8001/$name_aac

# ==== LC-AAC @ VBR 4 ~110kbps ====
#  -c:a libfdk_aac -vbr 4
#  -content_type 'audio/aac'
#  -vn -f adts icecast://source:PASSWORD@icecast:8001/$name_lcaac

# Xiph.org's Ogg Variant

# ==== Ogg Opus @VBR64k ====
# -c:a libopus -vbr on -b:a 64k
# -content_type 'audio/ogg'
# -vn -f opus icecast://source:PASSWORD@icecast:8001/$name_opus

# ==== Ogg Vorbis @ q3 ~112kbps ====
# -codec:a libvorbis -qscale:a 3
# -content_type 'audio/ogg'
# -vn -f ogg icecast://source:PASSWORD@icecast:8001/$name_vorbis

# ==== LAME MP3 @ V6 ~112kbps ====
# -codec:a libmp3lame -qscale:a 6
# -content_type 'audio/mpeg'
# -vn -f mp3 icecast://source:PASSWORD@icecast:8001/$name_mp3