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UnicornTranscoder

This software is a remote transcoder for Plex Media Server. It is able to handle all the requests from a Plex Client to transcode and serve a stream.

UnicornTranscoder Project

How does this work

  • The user send a request to the Plex server
  • The request is caught by UnicornLoadBalancer
  • The UnicornLoadBalancer answer a HTTP 302 with the URL of the UnicornTranscoder
  • The transcoder will send a request to the Plex Media Server
  • Plex Server will launch Plex Transcoder binary which was replaced by UnicornFFMPEG
  • UnicornFFMPEG send the arguments to the UnicornLoadBalancer
  • UnicornTranscoder pull FFMPEG argument from UnicornLoadBalancer
  • UnicornTranscoder launch FFMPEG and starts to serve the request for the stream

Setup

1. Needed Softwares

  • Plex Media Server
  • NodeJS
  • npm

2. Pre-required

3. Setup UnicornTranscoder

3.1 Configuration

You can either configure a transcoder by modifying config.js or setting environment variables.

port: env.int('SERVER_PORT', 3000),

Here is an example of config. To define the config we will call port, either edit the value (here it's 3000) or set the environement variable when launching the transcoder: SERVER_PORT=3001 npm start

Mandatory configuration
Variable Description
loadbalancer_address HTTP/HTTPS address of the UnicornLoadBalancer.
instance_address HTTP/HTTPS address of the UnicornTranscoder.

If you setup a Plex Media Server with the domain name https://my-pms.com, and you successfully setuped UnicornLoadBalancer, set load balancer_address to this adress.

If the domain name of your transcoder is https://transcoder1.my-pms.com, set instance_address to this address.

Plex Version configuration

Theses configurations are used to download automatically Plex Transcoder and codecs from Plex.

Variable Description
plex_arch Should not be modified since only ubuntu is supported now.
plex_build Full version number of Plex, can be found on download page.
codecs_build The version of the codecs, you can see it when you started PMS at least once in the Codecs folder of Plex.
In /var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Codecs the folder e7828f1-1324-linux-ubuntu-x86_64 means that the version is e7828f1-1324
eae_version Version of EasyAudioEncoder, can be found in the same folder as the Codecs
EasyAudioEncoder-141-linux-ubuntu-x86_64 => The version is 141
Performance configuration

In the performance section you cat set some limits that will be sent to the UnicornLoadBalancer. These limits are not hard limits. The UnicornLoadBalancer will be aware that the UnicornTranscoder is overloaded but can still send sessions if there is no other options.

Variable Description
maxSessions Maximum number of active sessions, it includes all active sessions, even if FFMPEG finished to transcode the file.
maxDownloads Maximum number of parallel download.
maxTranscodes Maximum number of active transcoding session, it includes all pending transcoding jobs.

Routing configuration (Expert only)

When a player will start a session, UnicornLoadBalancer will ask UnicornTranscoder where to redirect (302) the query based on the IP address of the client. The routing section allows you for a specific country code to route to a specific domain. For example you have a bad peering with a country, you can route the traffic to this country via CloudFlare and let others go through a direct routing domain.

routing: {
    'US': 'https://cf-transcode1.myplex.com',
    'FR': 'https://transcode1.myplex.com'
},

In this sample configuration, every IP with a GeoIP country code FR will get a redirection (302) to https://transcode1.myplex.com, US IPs will go to https://cf-transcode1.myplex.com. All IPs that don't match any rules will use the default route configured with the instance_address variable.

Other configuration

All these configuration are for advanced users.

Variable Description
port The port the UnicornTranscoder will listen
host The host interface UnicornTranscoder will listen
transcoder_decay_time If a session isn't requested for this amount of time (in second) the session will be deleted and transcoded files deleted.
ping_frequency UnicornTranscoder will ping the UnicornLoadBalancer to update stats every ping_frequency seconds

3.2 Installation

  • Install node dependencies with npm install
  • Run npm run install, it will:
    • Pull and extract Plex Media Server from plex.tv
    • Pull Codecs from plex.tv
    • Build the GeoIP database

Notes

SSL

The trancoder shouldn't serve the request directly, a reverse proxy such as nginx should be setup in front to install a SSL certificate.

FFMPEG from Source

You can compile FFMPEG, since the version of FFMPEG used by Plex is slightly different, you can follow this guide: https://gist.github.com/drouarb/fb082c521d46aa43fdbb8cdc3d61ffbc

This can allow you to run the transcoder on an ARM based server.

Implementation of libx264 on other platform than x86_64 is not well optimized, you can see a performance gap.

Disclamer

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Pull Requests are welcome 😉