Add ability to restream birdseye

[NickM-27]

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[netlify]

✅ Deploy Preview for frigate-docs canceled.

Name	Link
🔨 Latest commit	676986e
🔍 Latest deploy log	https://app.netlify.com/sites/frigate-docs/deploys/63af1c80470bf00008cd713d

[TestUser0000000001]

Yay! Excited for this feature to be baked in, had to do some voodoo magic before with puppeteer to have this done. keep up the good work.

[blakeblackshear]

I think we can use a named pipe to pass rawvideo data to go2rtc. This would avoid the extra encoding work to mpeg1.

I was able to get it to work in theory with the following:

Create a named pipe with mkfifo /tmp/birdseye. There is os.mkfifo in python as well.

go2rtc config:

streams:
  pipe: exec:ffmpeg -hide_banner -f rawvideo -pix_fmt yuv420p -s 1280x720 -i /tmp/birdseye -tune zerolatency -preset ultrafast -c:v libx264 -rtsp_transport tcp -f rtsp {output}

Use ffmpeg to write rawvideo frames to the named pipe with

ffmpeg -re -stream_loop -1 -i /workspace/airport.mp4 -pix_fmt yuv420p -f rawvideo pipe: > /tmp/birdseye

The ffmpeg process will block until go2rtc starts reading.

I think we should be able to write the same raw yuv frame data to the named pipe with python, but it may be tricky to figure out the blocking IO part while go2rtc isnt running.

This is another situation where zmq would probably be helpful for inter-process communication.

[Majestic7979]

I am trying to find a way to pull birdseye but I don't seem to do so. When I click the netlify log above, it says it failed... so was this even implemented? Not clear to me.

According to docs for 0.13:

https://deploy-preview-6262--frigate-docs.netlify.app/configuration/restream

It should work... but it doesn't. Birdseye actually shows up normally on my Frigate UI.
If I try to play back on VLC I get nothing. Using the same URL for my normal cameras, I do get the camera stream, so obviously something wrong with just Birdseye restream.