Adding go2rtc presets for Rockchip hardware acceleration

[MarcA711]

Works using this syntax:

go2rtc:
  streams:
    Cam:
      - ffmpeg:/config/Big_Buck_Bunny_1080_hevc.mp4#video=h264/rk

However, this does not work and uses software decoding instead:

go2rtc:
  streams:
    Cam:
      - ffmpeg:/config/Big_Buck_Bunny_1080_hevc.mp4#video=h264#hardware=rk

Is this normal behavior, because this preset was added using the config and not as a default preset?

And what about decoding? go2rtc calls FFmpeg this way:
ffmpeg -hide_banner -re -i /config/Big_Buck_Bunny_1080_hevc.mp4 -c:v libx264 -g 50 -profile:v high -level:v 4.1 -preset:v superfast -tune:v zerolatency -pix_fmt:v yuv420p -an -user_agent ffmpeg/go2rtc -rtsp_transport tcp -f rtsp {output}
So, no decoder is specified and and FFmpeg auto selects one. As far as I can see, this is the way it's done in go2rtc (selecting the encoder and not selecting decoder). Is this correct or should I also add decoding presets that can be passed using #input=hevc/rk_dec?

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[NickM-27]

#hardware is a go2rtc specific thing that requires a code change on the go2rtc side. I'm not sure if AlexxIt would be open to this given that the default go2rtc binary does not include support for rk hardware

[NickM-27]

I believe encoder should be fine as ffmpeg will auto select the decoder in this case