Rock 5B + Radxa Camera 4K

#1

Hello everyone, I’ve started a project to stream live 4K 60 fps video with telemetry overlay. I’ve picked Rock 5B and Radxa Camera 4K for this. I wan to run it on Arch Linux. I am half way there. So I’ve:

  1. installed Arch Linux (Kwankiu’s installer) to Rock 5B (rk3588)
  • used Joshua’s kernel 6.1 BSP
  1. connected Radxa Camera 4K
  2. installed camera-engine-rkaiq
  • fixed low brightness
  • fixed green colors

Then the result looks like this. How to get rid of those artifacts? I am using ffmpeg like:

ffmpeg -re -f v4l2 -video_size 3840x2160 -framerate 1/60 -pixel_format nv12 -i /dev/video11 -an -c:v hevc_rkmpp -b:v 20M -f mpegts tcp://@:9999?listen

Another question: Is it possible to reach 60 fps? FFmpeg complains that about 50% of frames are duplicated so although it seems to be 60 fps it is 30 fps in reality. Duplicit unanswered question. Another duplicit unanswered question.

Any help appreciated. This has already cost me more gray hairs than expected.

#2

Yes. You need to set 1920x1080@60fps mode. 3840x2160 mode is only 30fps.

What you see is a DMA sync issue. The latest ffmpeg introduced this DMA sync issue in kernel 6.1.
See here for more and some suggestions to fix this: [FFmpeg] Introduce FFmpeg-Rockchip for hyper fast video transcoding via CLI