# MPEG-4 container plugin for Membrane Framework

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This plugin provides utilities for MP4 container parsing and serialization along with elements for muxing the stream to MP4 or [CMAF](

## Installation
The package can be installed by adding `membrane_mp4_plugin` to your list of dependencies in `mix.exs`:

defp deps do
    {:membrane_mp4_plugin, "~> 0.11.0"}

## Usage
### `Membrane.MP4.Muxer.ISOM`
For an example of muxing streams to a regular MP4 file, refer to 

To run the example, you can use the following command:
elixir examples/muxer_isom.exs

You can use `MP4_OUTPUT_FILE` environment variable to set location of the output file (defaults to `example.mp4`).

### `Membrane.MP4.Muxer.CMAF`
For an example of muxing streams into CMAF format, refer to [`examples/muxer_cmaf.exs`](examples/muxer_cmaf.exs). CMAF requires a special sink, regular `Membrane.File.Sink` will not work correctly. Currently, Membrane Framework has only one sink capable of saving a CMAF stream - `Membrane.HTTPAdaptiveStream.Sink`.

To run the example, use the following command:
elixir examples/muxer_isom.exs
You can expect `hls_output` folder to appear and be filled with CMAF header and segments, as well as a HLS Playlist.
To play the stream, you need to serve the contents of the output folder with some sort of HTTP Server. If you are looking for something quick and simple, you can use Python's SimpleHTTPServer:
cd hls_output && python -m SimpleHTTPServer 8000
HLS Stream can then be played with
ffplay http://localhost:8000/index.m3u8

## Updating tests

In case `out_*` reference files in `test/fixtures/cmaf` change, `out_playlist.m3u8` and its dependent playlists should be updated and checked if they are still playable.
The current files have been checked with ffplay (FFmpeg) and Safari.

## Copyright and License

Copyright 2019, [Software Mansion](

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Licensed under the [Apache License, Version 2.0](LICENSE)