HLS Stream bandwidth issue.

[Oliver-Mardle]

I have an mpeg-ts HLS stream setup at 48,000 & 192k. However when listening to the stream, the bandwidth is showing 211.2k...
Am I missing something in the config?

radio = input.pulseaudio(id="Input", device="alsa_input.pci-0000_01_00.0.multichannel-input", clock_safe=false)

aac = %ffmpeg(format="mpegts",
  %audio(
    codec="aac",
    channels=2,
    ar=48000,
    b="192k"
  ))

streams = [("aac", aac)]

def segment_name(~position,~extname,stream_name) =
  timestamp = int_of_float(gettimeofday())
  duration = 2
  "#{stream_name}_#{duration}_#{timestamp}_#{position}.#{extname}"
end

output.file.hls(playlist="live.m3u8",
  "/home/npf/s3-mount/world-service/ENASE",
  segment_duration=1.0,
  segments=20,
  segment_name=segment_name,
  streams,
  radio
  )

[toots]

Hi! MpegTS, by definition of the standard, is known to pad data with extra bits, I wouldn't be surprised if that could be your issue here.

You might want to test with mp4 which is supposed to be better at that (but with extra complexity).

[Warblefly]

If it is of any use, here is my code using adts that does not inject padding. The resampling at 32000Hz is another trick to reduce bitstream bandwidth. I wrote this after discovering that another format was adding the dummy data you noticed. output.file.hls( playlist="live.m3u8", fallible=true, segment_name=segment_name, segment_duration=10.0, segments=20, segments_overhead=20, persist_at="/home/liquidsoap/audio/state_low.config", "/home/liquidsoap/audio", [ ( "HEAAC+", %ffmpeg( format="adts", %audio( codec="libfdk_aac", samplerate=32000, vbr=1, afterburner=1, profile="aac_he_v2" ) ).{bandwidth=30000,id3_version=3})], radio_comp )