Support for H.265-Based Cameras
Hi,

I'm using IMOU Ranger 2 camera (https://www.imoulife.com/product/detail/Ranger2) and it supports RTSP streams using H.265 codec when streamed via VLC. It was smooth as expected.

![IMG_0548](https://user-images.githubusercontent.com/66505845/135378314-9d19efb3-3e1c-4da2-9874-ee40ecea9463.jpg)

However, when streamed via HomeKit its choppy sometimes and there's some artefacts on the feed no matter the settings I've adjusted in the ffmpeg plugin. I even tried the "copy" in video codec section but this doesn't stream the feed at all, other codecs streams but its choppy.

This issue does not happen with cameras like Xiaofang & Dafang; it spits out the feed clearly. Below is the information I got from VLC:

![Screenshot 2021-09-30 at 10 52 46](https://user-images.githubusercontent.com/66505845/135378175-6b431370-69b1-4f24-bc3d-6beec46fd8f7.png)

Any ideas?