-- Force output to OGG.
local bitrate = bps or 9999999
local bitrate_max = 192000
if bitrate > input.bitrate then
bitrate = input.bitrate
end
output.parameters = {'-c:a', 'libvorbis', '-b:a', tostring(math.min(bitrate, bitrate_max))}
output.format = 'ogg'