Membrane FFmpeg SWResample plugin

Plugin performing audio conversion, resampling and channel mixing, using SWResample module of FFmpeg library.

It is a part of Membrane Multimedia Framework.

Installation

Add the following line to your deps in mix.exs. Run mix deps.get.

{:membrane_ffmpeg_swresample_plugin, "~> 0.4.0"}

You also need to have FFmpeg library installed. For usage on windows, see Using on Windows section below.

Sample usage

defmodule Resampling.Pipeline do
  use Membrane.Pipeline

  alias Membrane.Element.File
  alias Membrane.FFmpeg.SWResample.Converter
  alias Membrane.Caps.Audio.Raw

  @doc false
  @impl true
  def handle_init(_) do
    children = [
      file_src: %File.Source{location: "/tmp/input.raw"},
      converter: %Converter{
        input_caps: %Raw{channels: 2, format: :s24le, sample_rate: 48_000},
        output_caps: %Raw{channels: 2, format: :f32le, sample_rate: 44_100}
      },
      file_sink: %File.Sink{location: "/tmp/output.raw"},
    ]

    links = [
      link(:file_src)
      |> to(:converter)
      |> to(:file_sink)
    ]

    {{:ok, spec: %ParentSpec{children: children, links: links}}, %{}}
  end
end

Using on Windows

It is possible to compile and use this plugin on Windows platform. That requires:

• Git-LFS to clone binaries placed in ext/windows directory
• Visual C++ Build Tools with Windows SDK (tested on build tools 2015 and SDK for Windows 10)
• FFMpeg 3.4.2 DLLs - avutil-55.dll and swresample-2.dll (64-bit version abvailable here, 32-bit here). The DLLs have to be available at runtime. This can be achieved in a couple of ways:
  • adding directory with DLLs to PATH environment variable
  • placing them in current directory (where you start mix run)
  • placing them in the directory where erlang executable is located
  • making them available system-wide by placing in system (C:\Windows\System32, C:\Windows\SysWOW64) or Windows (C:\Windows) directory

Copyright and License

Copyright 2018, Software Mansion

Licensed under the Apache License, Version 2.0