No. I haven't tried anything new. My previous attempts compiling mpv in Trixie were unsuccessful. I want to try it again by compiling and installing this new ffmpeg+v4l2 first, then trying compiling mpv again. You should try it too

Ehm I just noticed that I'm running 6.1.99 kernel I am using 6.1.115 otherwise. I am guessing U-boot and boot paritions are where I am headed next. This is getting quite heavy for a newbie like me DO NOT FOLLOW MY PREVIOUS INSTRUCTIONS

Yes, already compile and all works now. root@transpeed-8k618-t:~# ls -l /dev/serial/by-id/* lrwxrwxrwx 1 root root 13 Nov 11 16:12 /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0 -> ../../ttyUSB0 lrwxrwxrwx 1 root root 13 Nov 11 15:56 /dev/serial/by-id/usb-Klipper_rp2040_E6647C7403433637-if00 -> ../../ttyACM0

Thanks a lot for the patch. Got the H264 encoder to encode the test pattern on Allwinner V3s, with the additional following patches: https://lkml.org/lkml/2020/11/16/486 "ARM: dts: sun8i: v3s: Add node for system control", https://lkml.org/lkml/2020/11/16/485 "ARM: dts: sun8i: v3s: Add video engine node", and the patch in attachment to enable JPEG/H264 encoder capabilities on V3s. However the lack of RAM on V3s causes the kernel CMA to really struggle so I have only been able to run the encoder at low definitions for now. 0001-media-cedrus-v3s-H264-and-JPEG-and-capabilities.patch

Up! I've forgot device in drawer until now, when my klipper host minipc died.. Got Klipper with CAN and Klipperscreen working great to run my Voron Trident. Awesome work guys, thanks again!