# Using Docker

[Docker](https://www.docker.com/whatisdocker) is a tool that can package an
application and its dependencies in a virtual container to run on different
host operating systems.

## Get Shaka Packager from Dockerhub

To pull latest Shaka Packager:

```shell
$ docker pull google/shaka-packager
```

You can pull a specific version, e.g. v1.6.2:

```shell
$ docker pull google/shaka-packager:release-v1.6.2
```

The full list of tags is available
[here](https://hub.docker.com/r/google/shaka-packager/tags/).

## Run the container

Assume you have your media files stored in `host_media_path` in the host
machine.

This runs the container and maps `host_media_path` to `media` in the container:

```shell
$ docker run -v /host_media_path/:/media -it --rm google/shaka-packager
```

Then in the container, run the packager command, e.g.:

```shell
$ packager input=/media/example.mp4,stream=audio,output=/media/audio.mp4 \
           input=/media/example.mp4,stream=video,output=/media/video.mp4 \
           --mpd_output /media/example.mpd
```

Outputs are available in the host's media folder `host_media_path`.