如果你的v4l2-ctl不支持直接捕获JPEG格式的图片,你可以使用以下步骤来捕获原始格式的图片,并将其转换为JPEG格式: 使用v4l2-ctl捕获原始格式的图片: bash v4l2-ctl --set-fmt-video=width=640,height=480,pixelformat=YUYV --capture-raw-to=userdata/capture.raw 这里,--capture-raw-to选项用于捕获原始数据到指定...
_DQEVENT,查看-wait-for-event获取可能的事件 -P, -get-parm 显示视频参数 VIDIOC_G_PARM -p, -set-parm=<fps> 设置视频帧率为<fps> VIDIOC_S_PARM -get-output-parm 显示输出视频参数 VIDIOC_G_PARM -set-output-parm=<fps> 设置输出视频帧率为<fps> VIDIOC_S_PARM -get-jpeg-comp 查询JPEG 压缩 ...
(Not Supported) test VIDIOC_G/S_JPEGCOMP: OK (Not Supported) Standard Controls: 0 Private Controls: 0 Format ioctls: fail: ../../../v4l-utils-1.20.0/utils/v4l2-compliance/v4l2-test-formats.cpp(312): Video Capture cap set, but no Video Capture formats defined test VIDIOC_...
[ 1329.649582] Modules linked in: crct10dif_ce flexcan can_dev mxc_jpeg_encdec imx8_media_dev(C)[ 1329.658125] CPU: 0 PID: 747 Comm: v4l2-ctl Tainted: G C 5.4.70-2.3.0+g4f2631b #1[ 1329.666822] Hardware name: Freescale i.MX8QXP MEK (DT)[ 1329.672047] pstate: 60000005 (nZCv...
Capture a JPEG photo with a specific resolution from video device: v4l2-ctl --device path/to/video_device --set-fmt-video=width=width,height=height,pixelformat=MJPG --stream-mmap --stream-to=path/to/output.jpg --stream-count=1 Capture a raw video stream from video device: v4l2-ctl -...
#define V4LCONVERT_USE_TINYJPEG 0x02 struct v4lconvert_data { int fd; int flags; /* bitfield */ int control_flags; /* bitfield */ unsigned int no_formats; int64_t supported_src_formats; /* bitfield */ char error_msg[V4LCONVERT_ERROR_MSG_SIZE]; struct jdec_private *tinyjpeg; #ifd...
Currently v4l2-ctl doesn't touch the sizeimage fields, so when the frame size is not small, the JPEG encoder cannot get enough buffer size. This adds sizeimage suboption for set-fmt-video options and the following command generates correct jpeg image. ...
Capture a JPEG photo with a specific resolution from video device:v4l2-ctl--devicepath/to/video_device--set-fmt-video=width=width,height=height,pixelformat=MJPG --stream-mmap --stream-to=path/to/output.jpg--stream-count=1 Capture a raw video stream from video device:v4l2-ctl--devicepath/...
# v4l2-ctl --all --device path/to/video_device 5. Capture a JPEG photo with a specific resolution from video device: # v4l2-ctl --device path/to/video_device --set-fmt-video=width=width,height=height,pixelformat=MJPG --stream-mmap --stream-to=path/to/output.jpg --stream-count=1 ...
Capture a JPEG photo with a specific resolution from video device $ v4l2-ctl --device [path/to/video_device] --set-fmt-video=width=[width],height=[height],pixelformat=MJPG --stream-mmap --stream-to=[path/to/output.jpg] --stream-count=1 Capture a raw video stream from video device ...