How to broadcast to Icecast2 by using ffmpeg (FLAC,Opus,Vorbis,AAC,MP3/Windows, Mac)

@FFMpeg

FFMpeg to Icecast2 Streaming Samples 
====================================
Examples usage of various codecs with FFMpeg.

## Samples
- flac.sh : An Icecast Source Client
    - for Windows (Cygwin is required) 
    - and macOS (`brew install ffmpeg`)
- another_examples.sh : Samples
    - FFMpeg can push to Icecast2 in various formats: Opus/Vorbis/AAC/MP3
    - this script shows optimal format, container and codec combinations.
    - Recommended settings for stable streaming with good quality:
        - HE-AAC (aac_he): 48k-64k
        - HE-AACv2 (aac_he_v2): 32k-48k
        - LC-AAC VBR 3-4
            - Higer is good quality, increases bitrate
            - if you want to use CBR, set 96k-128k. (not recommended)
        - Opus VBR 48k-64k
            - CBR is not recommended
        - Vorbis q3
            - Higer is good quality, increases bitrate
        - MP3 V6-V4
            - Lower is good quality, increases bitrate
            - if you want to use CBR, set 128k-160k

## Reference
- [Icecast Server/Streaming WebM to Icecast with FFmpeg](https://wiki.xiph.org/Icecast_Server/Streaming_WebM_to_Icecast_with_FFmpeg)

another_examples.sh

# 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

flac.sh

# 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