open USB UVC web camera start error

[cool]

hi：

I’m using the STM32N6570-DK board to develop a USB-host application that connects to a UVC webcam.
I started from the example in
STM32Cube_FW_N6_V1.2.0/Projects/STM32N6570-DK/Applications/USBX/Ux_Host_VIDEO.

At run-time the start-up fails here:

status = ux_host_class_video_start(video); // returns 0x54

Looking at ux_api.h, 0x54 equals
#define UX_FUNCTION_NOT_SUPPORTED 0x54

I’m now stuck. Could you give me some pointers on how to debug and solve this?
Thanks a lot!

Board: STM32N6570-DK
Web-cam info (Windows):
PS D:\workspace\temp> ffmpeg -hide_banner -list_options true -f dshow -i video="WEB CAMER"
[dshow @ 00000189a52882c0] DirectShow video device options (from video devices)
[dshow @ 00000189a52882c0] Pin "捕获" (alternative pin name "0")
[dshow @ 00000189a52882c0] vcodec=mjpeg min s=1280x720 fps=30 max s=1280x720 fps=30
[dshow @ 00000189a52882c0] vcodec=mjpeg min s=1280x720 fps=30 max s=1280x720 fps=30 (pc, bt470bg/bt709/unknown, center)
[dshow @ 00000189a52882c0] vcodec=mjpeg min s=640x480 fps=30 max s=640x480 fps=30
[dshow @ 00000189a52882c0] vcodec=mjpeg min s=640x480 fps=30 max s=640x480 fps=30 (pc, bt470bg/bt709/unknown, center)
[dshow @ 00000189a52882c0] vcodec=mjpeg min s=320x240 fps=30 max s=320x240 fps=30
[dshow @ 00000189a52882c0] vcodec=mjpeg min s=320x240 fps=30 max s=320x240 fps=30 (pc, bt470bg/bt709/unknown, center)
[dshow @ 00000189a52882c0] pixel_format=yuyv422 min s=640x480 fps=30 max s=640x480 fps=30
[dshow @ 00000189a52882c0] pixel_format=yuyv422 min s=640x480 fps=30 max s=640x480 fps=30 (tv, bt470bg/bt709/unknown, topleft)
[dshow @ 00000189a52882c0] pixel_format=yuyv422 min s=480x320 fps=30 max s=480x320 fps=30
[dshow @ 00000189a52882c0] pixel_format=yuyv422 min s=480x320 fps=30 max s=480x320 fps=30 (tv, bt470bg/bt709/unknown, topleft)
[dshow @ 00000189a52882c0] pixel_format=yuyv422 min s=320x240 fps=30 max s=320x240 fps=30
[dshow @ 00000189a52882c0] pixel_format=yuyv422 min s=320x240 fps=30 max s=320x240 fps=30 (tv, bt470bg/bt709/unknown, topleft)
Error opening input file video=WEB CAMER.

The log information I added:

>>>>>video live start process video_thread_entry 100
state:start video_thread_entry 198
ssssss start video
ssssss start video status:84 wit count:0
ssssss start video status:84 wit count:1
ssssss start video status:84 wit count:2
>>>>>video live start process video_thread_entry 100
sate:idle hard wait 2 secvideo_thread_entry 104
start get first format data 108
first format reqid:1
first format subtype:6
first format desp:3
frame data reqid:1
frame data subtype:6
start get frame data 135
frame data get reqid:1
frame data get subtype:36
frame data get frmint:333333
frame data get height:720
frame data get width:1280
frame data get inttype:1
frame data get intervals:
start set param data 167
get max_payload_size:3069
update start 192
>>>>>video live start process video_thread_entry 100
state:start video_thread_entry 198
ssssss start video
ssssss start video status:84 wit count:0
ssssss start video status:84 wit count:1
ssssss start video status:84 wit count:2

[Julian E.]

Hello @cool,

Do you think this could help you? 

STMicroelectronics/x-cube-n6-ai-h264-usb-uvc: An AI software application package demonstrating complex use case on STM32N6 product: camera capture, people detection inference on NPU, H264 encoding and USB UVC streaming to host.

If not let me know so I can look for the person in charge of the usbX project and hopefully find some answers.

Have a good day,

Julian

[dumb]

Hello, I encountered the same error as you: status = ux_host_class_video_start(video); // returns 0x54. Have you solved this problem? If so, could you share your solution