Rotating stream 90º
I need to rotate the stream of my cam 90º, something that works with:
`"videoFilter": "transpose=0",`
But that needs to use a vcodec which is just not posible with my rpi 3b...

[Someone](https://www.reddit.com/r/homebridge/comments/vn8ur3/comment/ie667bm/?utm_source=reddit&utm_medium=web2x&context=3) mentioned in reddit a very cool idea about changing the metadata of the feed so the "player" would automatically rotate the video without having to encode it:

`"encoderOptions": "-preset ultrafast -tune zerolatency -metadata:s:v:0 rotate=90",`

HomeKit actually recognises it! And it provides the still preview rotated, but as soon as the camera is open it comes back to the normal orientation...

Does anyone have any idea on how this could be implemented? Or maybe if this could be included in the plugin?
It is a great addition for those who want to install a doorbell...