Black Screen no Sound

*I'm submitting a ...*
- [x] bug report
- [ ] feature request
- [ ] support request

## General infomration

### Prerequisites

* [x] Are you running the latest version?

### Description

[Description of the bug or feature]

### Steps to Reproduce
Add netflix addon
Enable input stream addons
Download and install widevine when prompted
Restart kodi
Login to netflix
Choose a show

**Expected behavior:** [What you expected to happen]
Play show

**Actual behavior:** [What actually happened]
Black screen with no sound

## Context (Environment)
Arch linux, Kodi 17.6

### Installation

* [ ] I installed the plugin via zip from the Releases page
* [x] I´m using the Netflix Repo
* [ ] I´m using a different source (Please tell which)

### Operating System

* [x] Linux (x86/x64)
* [ ] OSX (x86/x64)
* [ ] Windows (x86/x64)
* [ ] Linux (ARM)
* [ ] Android

## Debug log

[Please include a link to your debug log (use something like [http://sprunge.us/](http://sprunge.us/)) or similar, please do not paste]
https://paste.pound-python.org/show/Jv5VwinkJmjv3yhAumrI/

Start by reviewing the linked debug log alongside the reproduction steps for Arch Linux, Kodi 17.6, the Netflix add-on, inputstream add-ons, and Widevine. Done means identifying a supported fix or a clearly documented cause for the black screen and missing sound during show playback.

Written by the indexing model from the issue text.