No output observed on weston compositor with ffmpeg rendering

[Angus]

Environment (Ubuntu):

1. sudo su;unset DISPLAY;export XDG_RUNTIME_DIR=/tmp/
2. systemctl stop gdm3 (stop the gdm3)
3. weston --tty=2 &

How to reproduce:

ffmpeg -re -hwaccel qsv -hwaccel_output_format qsv -v verbose -c:v h264_qsv -i /media/H264_Videos/Skyfall_3840x2160_30mbps_30fps_Main@L5.2.mp4 -vf vpp_qsv=w=3840:h=2160:format=yuv420p -pix_fmt yuv420p -f sdl2 -

1. works fine on ffmpeg 5 and no output all ffmpeg 6 versions.
2. works fine on all ffplay version.
3. works fine under x11 (or with xwayland)

[quinkblack]

The same issue as in ​https://trac.ffmpeg.org/ticket/10625