a.rodionov

You are welcome. Yes, you need just .ko module. I used 5.7 kernel, but everything that i did works fine wih 5.4+ kernels. If i will speak more accuracy, i should to say that i have builded custom kernel in this project, but i did it for another changes, not for h264 encoding.

Hello. I m sorry for long answer. So, I use rebuilded ffmpeg with cedrus, cedrus driver and modified dts from @ubobrov. Dts and driver is here. You can try to follow this I m hope I could help you.

Full .dts, which is works for us, now is placed in uboborov repository.

Yes, it is. On nanopi neo air with armbian 20.08.0 (5.7.8) it works. FFmpeg with 960x720 input from our camera* encode mp4 by h264_omx with 15-20 fps. If i use cedrus264 as codec, ffmpeg can easy provide 30 fps. With default cam500b i get 60 fps 640x480 (that is maximum of the camera). Fps numbers i get from ffmpeg log and i think this results is accurate enough. * our camera isn't ov5640 default camera and 30 fps likely it's maximum fps. We haven't camera's datasheet.

Thanks to all for help. We have setuped uboborov sunxi-cedar-mainline in 5.7 armbian kernel. I think, early we did some errors in dts. Our current dts we published in https://github.com/Rexarrior/sunxi-cedar-mainline. Big thanks to uboborov!

Thank you for you answer. What kernel version do you mean as legacy kernel? In armbian build tool legacy kernel is 4.19 kernel and it has no cedrus at all, including /dev/cedar_dev. We found topic from Uboborov(this), and his driver (this) with hardware h264 encoder (this). We build fresh 4.19 kernel, Uboborov's driver and install it to our system. Driver has loaded successfully (determine by lsmod). We change dts, as it changed in his github, but still there isn't /dev/cedar_dev. Also, as i already said in my first post, we also try to use Uboborov's ffmpeg (this), including precompiled binaries (found there).

Hi all. I have a board nanopi neo air with armbian linux on it. We with my colleague try to setting up ffmpeg with cedrus264 for hardware accelerated capturing video from ov5640-like camera device. There is my armbianmonitor. There are my v4l2-ctl -d /dev/videox -D out: After some reconfiguration of dts, we can successfully capture video in low fps with ffmpeg -f v4l2 -framerate 25 -video_size 960x720 -i /dev/video1 output.mkv but with ffmpeg -f v4l2 -channel 0 -video_size 960x720 -i /dev/video1 -pix_fmt nv12 -r 30 -b:v 64k -c:v cedrus264 test.mp4 ffmpeg failed: Ffmpeg was buided from FFmpeg-Cedrus, also we try follow this and use this binaries - result haven't changed. After some inspecting sources of ffmpeg-cedrus we found that ffmpeg try to open /dev/cedar_dev device, which don't exists in our system. Ffmpeg fails on opening device. If we replace /dev/cedar_dev by /dev/video0, where is our cedrus driver, ffmpeg fails on ioctl IOCTL_GET_ENV_INFO. In source, it is 99 or 101 line. We check kernel config for configuration, provided by Sunxi-Cedrus and determine that cedrus was configured right. Also we have tried all described actions on official armbian buster image for nanopi neo air and we have got the same result. What we does wrong?