lua script to write all properties to /dev/shm/mpv-status every second

dump_properties.lua

function writeproperty(name)
    value = mp.get_property(name)
    if value ~= nil then
        file:write(string.gsub(value, "\n", "\\n"))
    end
    file:write("\n")
end
timer = mp.add_periodic_timer(1, function()
    os.remove("/dev/shm/mpv-status")
    file = io.open(string.format("/dev/shm/mpv-status", math.random(0, 100)), "w")
    properties = mp.get_property('property-list')
    file:write("volume,speed,media-title\n")
    writeproperty("volume")
    writeproperty("speed")
    writeproperty("media-title")
    file:close()
end)

parse_mpv-status.py

#!/usr/bin/env python3
import json
import binascii
result = {}
with open('/dev/shm/mpv-status', 'rb') as f:
    properties = None
    for i, line in enumerate(f):
        line = line[:-1]
        try:
            line = line.decode('utf8')
        except UnicodeDecodeError:
            line = binascii.hexlify(line).decode('utf8')
        if properties is None:
            properties = [None] + line.split(',')
            continue
        result[properties[i]] = line
print(json.dumps(result, indent=4))