Boombox

Boombox is a high-level tool for audio & video streaming tool based on the Membrane Framework.

See examples.livemd for examples.

Usage

The code below receives a stream via RTMP and sends it over HLS:

Boombox.run(input: "rtmp://localhost:5432", output: "index.m3u8")

you can use CLI interface too:

boombox -i "rtmp://localhost:5432" -o "index.m3u8"

And the code below generates a video with bouncing Membrane logo and sends it over WebRTC:

Mix.install([:boombox, :req, :image])

overlay =
  Req.get!("https://avatars.githubusercontent.com/u/25247695?s=200&v=4").body
  |> Vix.Vips.Image.new_from_buffer()
  |> then(fn {:ok, img} -> img end)
  |> Image.trim!()
  |> Image.thumbnail!(100)

bg = Image.new!(640, 480, color: :light_gray)
max_x = Image.width(bg) - Image.width(overlay)
max_y = Image.height(bg) - Image.height(overlay)

Stream.iterate({_x = 300, _y = 0, _dx = 1, _dy = 2, _pts = 0}, fn {x, y, dx, dy, pts} ->
  dx = if (x + dx) in 0..max_x, do: dx, else: -dx
  dy = if (y + dy) in 0..max_y, do: dy, else: -dy
  pts = pts + div(Membrane.Time.seconds(1), _fps = 60)
  {x + dx, y + dy, dx, dy, pts}
end)
|> Stream.map(fn {x, y, _dx, _dy, pts} ->
  img = Image.compose!(bg, overlay, x: x, y: y)
  %Boombox.Packet{kind: :video, payload: img, pts: pts}
end)
|> Boombox.run(
  input: {:stream, video: :image, audio: false},
  output: {:webrtc, "ws://localhost:8830"}
)

To receive WebRTC/HLS from boombox in a browser or send WebRTC from a browser to boombox you can use simple HTML examples in the boombox_examples_data folder, for example

wget https://raw.githubusercontent.com/membraneframework/boombox/v0.1.0/boombox_examples_data/webrtc_to_browser.html
open webrtc_to_browser.html

For more examples, see examples.livemd.

Supported formats & protocols

format	direction
MP4	input, output
WebRTC	input, output
RTMP	input
RTSP	input
HLS	output
Elixir Stream	input, output

Installation

To use Boombox as an Elixir library, add

{:boombox, github: "membraneframework-labs/boombox"}

to your dependencies or Mix.install.

to use via CLI, run the following:

wget https://raw.githubusercontent.com/membraneframework/boombox/v0.1.0/bin/boombox
chmod u+x boombox
./boombox

Make sure you have Elixir installed. The first call to boombox will install it in a default directory in the system. The directory can be set with MIX_INSTALL_DIR env variable if preferred.

CLI

The CLI API is similar to the Elixir API, for example:

Boombox.run(input: "file.mp4", output: {:webrtc, "ws://localhost:8830"})

is equivalent to:

./boombox -i file.mp4 -o --webrtc ws://localhost:8830

It's also possible to pass an .exs script:

./boombox -s script.exs

In the script you can call Boombox.run(...) and execute other Elixir code.

The first run of the CLI may take longer than usual, as the necessary artifacts are installed in the system.

Copyright and License

Copyright 2024, Software Mansion

Licensed under the Apache License, Version 2.0