Background streaming of audio channels from Amcrest cameras.
Streams G.711 a-law formatted audio packets. See section 4.3.4 of the api manual.
curl --digest \
-u 'user:password' \
'http://192.168.1.123/cgi-bin/audio.cgi?action=getAudio&httptype=singlepart&channel=1' \
> /dev/null
- httptype: 'singlepart' || 'multipart'
- channel: integer (the audio channel)
- uses digest authentication