ffplay can not play video of V4L2 virtual camera with YUYV422 format

I modified a line of code in scrcpy to generate a stream in YUYV422 format and output it to the V4L2 virtual camera. When I play it with ffplay, an error occurs.

1. app/src/v4l2_sink.c

2. create a virtual camera
sudo v4l2loopback-ctl add /dev/video0 -b 8

3. set format of virtual camera
sudo v4l2loopback-ctl set-caps /dev/video0 "YUYV:640x480"

4. scrcpy to virtual camera
scrcpy --v4l2-sink /dev/video0

5. test with ffplay
ffplay -pixel_format yuyv422 -i /dev/video0

6. errors
[video4linux2,v4l2 @ 0x7f9654000b80] ioctl(VIDIOC_QUERYBUF): Invalid argument
/dev/video0: Invalid argument

Start with app/src/v4l2_sink.c and reproduce the failure using the v4l2loopback setup, YUYV:640x480 caps, scrcpy --v4l2-sink, and ffplay -pixel_format yuyv422. Trace the V4L2 buffer setup around the reported VIDIOC_QUERYBUF error; done means ffplay can open and play the virtual camera stream without the Invalid argument error.

Written by the indexing model from the issue text.