Read MV-MIPI-SC130M with openCV

skyhorizon

我尝试使用三个v4l2_opencv_show.py示例读取相机视频流，然而均无法打开摄像头，使用的是cv2.vedioCapture()方法：

cap = cv2.VideoCapture("v4l2src io-mode=dmabuf device=/dev/video0 ! video/x-raw, format=(string)GREY, width=(int)1280, height=(int)1024 ! appsink")

SC130M支持GREY、Y10等格式，但V4L2的x-raw并不支持，我尝试使用cv2.vedioCapture(0)、缺省format参数，x-raw支持的format=GRAY8进行读取，但是结果显示

[ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (1824) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Device '/dev/video0' does not support 1:4:7:1 colorimetry

我也尝试使用相机支持的GREY进行读取，但是gstreamer无法识别：

[ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (734) open OpenCV | GStreamer warning: Error opening bin: could not link v4l2src0 to appsink0, v4l2src0 can't handle caps video/x-raw, format=(string)GREY, width=(int)1280, height=(int)1024
[ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (501) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
camera open failed

veye_xumm

@skyhorizon 你使用的主板是什么？运行环境是什么版本？

skyhorizon

@veye_xumm
RPI OS 5.15.84 驱动是本地编译的5.15_all。

v4l2-ctl -d /dev/video0 --all

Driver Info:
	Driver name      : unicam
	Card type        : unicam
	Bus info         : platform:fe801000.csi
	Driver version   : 5.15.84
	Capabilities     : 0x85a00001
		Video Capture
		Metadata Capture
		Read/Write
		Streaming
		Extended Pix Format
		Device Capabilities
	Device Caps      : 0x05200001
		Video Capture
		Read/Write
		Streaming
		Extended Pix Format
Media Driver Info:
	Driver name      : unicam
	Model            : unicam
	Serial           : 
	Bus info         : platform:fe801000.csi
	Media version    : 5.15.84
	Hardware revision: 0x00000000 (0)
	Driver version   : 5.15.84
Interface Info:
	ID               : 0x03000005
	Type             : V4L Video
Entity Info:
	ID               : 0x00000003 (3)
	Name             : unicam-image
	Function         : V4L2 I/O
	Flags         : default
	Pad 0x01000004   : 0: Sink
	  Link 0x02000007: from remote pad 0x1000002 of entity 'mvcam 10-003b': Data, Enabled, Immutable
Priority: 2
Video input : 0 (Camera 0: ok)
Format Video Capture:
	Width/Height      : 1280/1024
	Pixel Format      : 'GREY' (8-bit Greyscale)
	Field             : None
	Bytes per Line    : 1280
	Size Image        : 1310720
	Colorspace        : sRGB
	Transfer Function : Default (maps to sRGB)
	YCbCr/HSV Encoding: Default (maps to ITU-R 601)
	Quantization      : Default (maps to Full Range)
	Flags             : 
Crop Capability Video Capture:
	Bounds      : Left 0, Top 0, Width 1280, Height 1024
	Default     : Left 0, Top 0, Width 1280, Height 1024
	Pixel Aspect: 1/1
Selection Video Capture: crop, Left 0, Top 0, Width 1280, Height 1024, Flags: 
Selection Video Capture: crop_default, Left 0, Top 0, Width 1280, Height 1024, Flags: 
Selection Video Capture: crop_bounds, Left 0, Top 0, Width 1280, Height 1024, Flags: 
Selection Video Capture: native_size, Left 0, Top 0, Width 1280, Height 1024, Flags: 

User Controls

                horizontal_flip 0x00980914 (bool)   : default=0 value=0
                  vertical_flip 0x00980915 (bool)   : default=0 value=0
                   trigger_mode 0x00981901 (int)    : min=0 max=2 step=1 default=0 value=0 flags=volatile, execute-on-write
                    trigger_src 0x00981902 (int)    : min=0 max=1 step=1 default=1 value=1 flags=volatile, execute-on-write
                    soft_trgone 0x00981903 (button) : flags=write-only, execute-on-write
                     frame_rate 0x00981904 (int)    : min=0 max=22 step=1 default=22 value=22 flags=volatile, execute-on-write

Camera Controls

         camera_sensor_rotation 0x009a0923 (int)    : min=0 max=0 step=1 default=0 value=0 flags=read-only

Image Processing Controls

                     pixel_rate 0x009f0902 (int64)  : min=750000000 max=750000000 step=1 default=750000000 value=750000000 flags=read-only

~ $ dmesg | grep mvcam
[    8.132715] veye_mvcam: loading out-of-tree module taints kernel.
[    8.648215] mvcam 10-003b: camera is: MV-MIPI-SC130M
[    8.649037] mvcam 10-003b: firmware version: 0x1260132
[    8.657495] mvcam 10-003b: Consider updating driver mvcam to match on endpoints

skyhorizon

@skyhorizon 硬件平台是RPI 4B

veye_xumm

@skyhorizon
请参考以下这个回复
http://forum.veye.cc/topic/304/求助树莓派mv-mipi-imx178m-使用python调用cv2-videocapture显示can-t-open-camera-by-index/2

skyhorizon

@veye_xumm 能否提供一些在python或是c/c++中可用的读取接口或程序示例，我需要一个确定可用的程序对摄像头进行功能测试，最好能兼容opencv和gstreamer