Scrambled snapshots stream works fine
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**Describe The Problem:**
<!-- A clear and concise description of what the bug is. -->In the main screen that shows the still image previews before accessing live streams, the snapshot has been showing scrambled. The live feed works fine. It’s a Wyze cam with the v2 beta enabled rtsp.

![2C62A7D4-A099-41EB-A6A6-A508DD07392F](https://user-images.githubusercontent.com/3494551/89694830-ecc71c80-d8df-11ea-96b2-d046824a4554.png)


**To Reproduce:**
<!-- Steps to reproduce the behavior. -->To reproduce, I open the home app and look at the driveway thumbnail preview

**Logs:**
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```
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```

**Homebridge Config:**

```json
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Remove any sensitive information, such as your homebridge-gsh / google-smarthome token.
```

**Screenshots:**
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**Environment:**

* **Node.js Version**: <!-- node -v -->
* **NPM Version**: <!-- npm -v -->
* **Homebridge Version**: <!-- homebridge -V -->
* **Homebridge Camera FFmpeg Version**:
* **Homebridge Config UI X Plugin Version**:
* **Operating System**: <!-- Raspbian / Ubuntu / Debian / Windows / macOS / Docker -->


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