Membrane FFmpeg SWResample plugin

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

It is a part of Membrane Multimedia Framework.

installation

Installation

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

{:membrane_ffmpeg_swresample_plugin, "~> 0.10.0"}

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

sample-usage

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

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 2018, Software Mansion

Software Mansion

Licensed under the Apache License, Version 2.0