go2rtc/ffmpeg cpu usage monitoring in web interface

[tve]

Running 0.15.0-beta2 I had go2rtc transcode an mjpeg stream to h264 using ffmpeg without hardware acceleration and it was using a steady 30% of cpu. I saw 'ffmpeg' in top but since there are umpteen ffmpeg processes running I couldn't tell what it was. I looked in the frigate system metrics and it didn't show either! (But it did show "CPU:30%" in the footer.) Unless I'm missing something, it would be nice to add a section that shows go2rtc cpu usage, including child processes.

[hawkeye217]

Under the General tab in System Metrics, you should have a "Process CPU Usage" column, including a go2rtc graph.

[tve]

Yup, you are correct! However, this did not show the 30% cpu that were consumed by the ffmpeg subprocess of go2rtc which was transcoding without hardware acceleration.

[hawkeye217]

Right, because go2rtc just runs ffmpeg when you do transcoding with ffmpeg:rtsp://.../#video=h264 in your go2rtc config.

[NickM-27]

In order for us to do this we'd need a more specific tool that tells us what ffmpeg processes belong to go2rtc, then we could show them on the camera specific page, not sure how possible that will be