FFmpeg process ended unexpectedly with an exit code of 1.
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First of all -- amazing work to get this functionality in. Some things I'm noticing but didn't want these to slip away.

**Describe The Problem:**
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FFmpeg process unexpectedly ends when motion event outside activity zone is recorded. 

The vehicle videos recorded are also not showing up as an option to view home application (but available in Unifi Protect app)

**To Reproduce:**
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Not 100% of the cause, but checking the Unifi Protect camera events showed that a vehicle driving by was recorded during that exact time. 

I've got an activity zone setup in iOS Home and a motion zone in protect to exclude the recording area where the vehicle passed by. 

Recording Options - Specific Motion is Detected w/ people, animals, vehicles, packages & record audio.
Notification Option - Specific Motion is Detected w/ people, animals, packages. 

**Logs:**
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```
[2/14/2022, 1:41:19 PM] [homebridge-unifi-protect] UCK-G2-Plus [UCK-G2-PLUS] UVC G4 Doorbell [UVC G4 Doorbell]: FFmpeg process ended unexpectedly with an exit code of 1.
[2/14/2022, 1:41:20 PM] [homebridge-unifi-protect] UCK-G2-Plus [UCK-G2-PLUS] UVC G4 Doorbell [UVC G4 Doorbell]: HomeKit Secure Video has recorded a 5 second motion event.
```

**Screenshots:**
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![image](https://user-images.githubusercontent.com/56973378/153948338-dca92161-8466-4464-8387-005216e92bf8.png)


**Environment:**

* **Homebridge Version:** 1.4.0
* **Node Version:** 16.13.1
* **Homebridge-UniFi-Protect Plugin Version:** 5.3.1
* **UniFi Protect Version:** 1.20.3
* **UniFi Protect Controller Type:** UCKgen2
* **UniFi Protect Controller Firmware Version:** 2.3.14 
* **Apple Device and iOS / macOS / iPadOS / tvOS Version:**15.3
* **Operating System and OS Version:** Docker / Synology DS920+

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