Continuing the weather radio development. I found some notes on to try sox instead of lame for the encoding for ezstream. This requires installing the mp3 library for sox with sudo apt-get install libsox-fmt-mp3. This appears to provide for somewhat better sound quality.
This means we replace
lame --bitwidth 16 --signed -s 22050 --lowpass 3500 --abr 64 --scale 8 -r -m m - -
with
sox -t raw -r 22050 -b 16 -e signed -c 1 -v 7 - -r 22050 -t mp3 -c 1 -C 64 - sinc -3.5k
The final line:
rtl_fm -f 162550000 -s 22050 -p 14 | tee >(sox -t raw -r 22050 -b 16 -e signed -c 1 -v 7 - -r 22050 -t mp3 -c 1 -C 64 - sinc -3.5k |ezstream -c ezstream.xml) | multimon-ng -t raw -a EAS /dev/stdin | python ~/tg-dsame/dsame.py --no-text --mqtt jtk-pi2 --json output.json