[Issue#898] webrtc/hls video support

#### Description

I have a working setup with a raspberry pi 3B+, bookworm OS and used the raspbian image script to install cncjs, and everything works well.

When I insert a USB-webcamera, I am able to see its video feed. Good so far.

However, I’m greedy. I figure the webcam has a microphone as well, and it would be helpful to also have audio alongside the video. This let me down a one-day-long-rabbithole, that as landed me in a semi-working setup. I feel I’m almost there.

So now, on the rpi-3b:
* I installed mediamtx
* I’m using ffmpeg to transcode the yuv frames and mic input into a rtsp stream using the below command:

“
ffmpeg -f v4l2 \
-framerate 5 \
-s 800x600 \
-i /dev/v4l/by-id/usb-046d081b44519B90-video-index0 \
-f alsa -channels 1 \
-sample_rate 16000 \
-i hw:2,0 \
-vcodec h264_v4l2m2m \
-b:v 400k \
-maxrate 400k \
-bufsize 400k \
-acodec opus \
-b:a 8k \
-strict experimental \
-f rtsp -rtsp_transport tcp \
rtsp://0.0.0.0:8554/stream
`
* Now, we have a rtsp stream containing audio+video going into mediamtx
* Opening a browser, I can see a webrtc stream in a standalone window. :8889Relevant debug messages below

`
INF MediaMTX v1.10.0
INF configuration loaded from /home/pi/mediamtx.yml
INF [RTSP] listener opened on :8554 (TCP), :8000 (UDP/RTP), :8001 (UDP/RTCP)
INF [RTMP] listener opened on :1935
INF [HLS] listener opened on :8888
INF [WebRTC] listener opened on :8889 (HTTP), :8189 (ICE/UDP)
INF [SRT] listener opened on :8890 (UDP)
...
...
INF [RTSP] [session 077fb4e5] created by 127.0.0.1:48084
INF [RTSP] [session 077fb4e5] is publishing to path 'stream', 2 tracks (H264, Opus)
INF [WebRTC] [session 879c13d9] created by 192.168.1.102:33030
INF [WebRTC] [session 879c13d9] peer connection established, local candidate: host/udp/192.168.1.106/8189, remote candidate: prflx/udp/192.168.1.102/55759
[WebRTC] [session 879c13d9] is reading from path 'stream', 2 tracks (H264, Opus)
`
* Now we come to the problem. When in the webcamera widget, I give as source http://0.0.0.0:8889/stream OR http://:8889/stream, nothing shows up. Instead in the browser debug, I see the error. err:BLOCKEDBYORB`
* I wonder if this is related to #672
* I have both options HLS & WebRTC, if either work, then I needn’t open a separate browser window.

#### Versions

– CNCjs: 1.10.5
– Node.js: 18.19.0
– NPM: 9.2.0

#### How Do You Install CNCjs?

– [x] NPM
– [ ] Download the CNCjs Desktop Application

#### CNC Controller

– [x] Grbl
– [ ] Smoothieware
– [ ] TinyG/g2core

#### Hardware

– [x] Raspberry Pi
– [ ] Desktop or Laptop
– [ ] Mobile Device

#### Operating System

– [x] Not Applicable
– [ ] Windows
– [ ] Mac
– [ ] Linux