# Membrane H264 FFmpeg plugin

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This package provides H264 video decoder and encoder, based on [ffmpeg](https://www.ffmpeg.org)
and [x264](https://www.videolan.org/developers/x264.html).

It is a part of the [Membrane Multimedia Framework](https://membraneframework.org)

Documentation is available at [HexDocs](https://hexdocs.pm/membrane_h264_ffmpeg_plugin/)

Note: `Membrane.H264.FFmpeg.Parser` has been removed. Now you can use our pure Elixir implementation of the H264 parser: [`Membrane.H264.Parser`](https://hexdocs.pm/membrane_h264_plugin/Membrane.H264.Parser.html) from [membrane_h264_plugin](https://github.com/membraneframework/membrane_h264_plugin).

## Installation

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

```elixir
{:membrane_h264_ffmpeg_plugin, "~> 0.31.3"}
```

This package depends on the [ffmpeg](https://www.ffmpeg.org) libraries. The precompiled builds will be pulled and linked automatically. However, should there be any problems, consider installing it manually.

### Manual instalation of dependencies
#### Ubuntu

```bash
sudo apt-get install libavcodec-dev libavformat-dev libavutil-dev
```

#### Arch/Manjaro

```bash
pacman -S ffmpeg
```

#### MacOS

```bash
brew install ffmpeg
```

## Usage Example

### Decoder

The following pipeline takes 30fps H264 file and decodes it to the raw video.

```elixir
Logger.configure(level: :info)

Mix.install([
  :membrane_h264_ffmpeg_plugin,
  :membrane_h264_plugin,
  :membrane_file_plugin,
  :req
])

h264 = Req.get!("https://raw.githubusercontent.com/membraneframework/static/gh-pages/samples/ffmpeg-testsrc.h264").body
File.write!("input.h264", h264)

defmodule Decoding.Pipeline do
  use Membrane.Pipeline

  @impl true
  def handle_init(_ctx, _opts) do
    structure =
      child(%Membrane.File.Source{chunk_size: 40_960, location: "input.h264"})
      |> child(Membrane.H264.Parser)
      |> child(Membrane.H264.FFmpeg.Decoder)
      |> child(%Membrane.File.Sink{location: "output.raw"})

    {[spec: structure], %{}}
  end
end

Membrane.Pipeline.start_link(Decoding.Pipeline)
```

### Encoder

The following pipeline takes 720p raw video file as input and encodes it as H264.

```elixir
defmodule Encoding.Pipeline do
  use Membrane.Pipeline

  @impl true
  def handle_init(_) do
    structure =
      child(:source, %Membrane.File.Source{chunk_size: 40_960, location: "input.raw"})
      |> child(:parser, %Membrane.RawVideo.Parser{width: 1280, height: 720, pixel_format: :I420})
      |> child(:encoder, %Membrane.H264.FFmpeg.Encoder{preset: :fast, crf: 30})
      |> child(:sink, %Membrane.File.Sink{location: "output.h264"})

    {[spec: structure], %{}}
  end
end
```

## Copyright and License

Copyright 2018, [Software Mansion](https://swmansion.com/?utm_source=git&utm_medium=readme&utm_campaign=membrane)

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