How to use nvv4l2decoder with usb camera?

Accelerated Computing Intelligent Video Analytics DeepStream SDK
#1

Hi all.
I Have a usb camera: MJPG ， 1920*1080 ， 30fps.
To test it,I got a pipeline,
gst-launch-1.0
v4l2src device=/dev/video2 ! “image/jpeg,width=1920,height=1080,framerate=30/1” ! nvv4l2decoder mjpeg=1 ! \
nvvideoconvert ! “video/x-raw(memory:NVMM),format=NV12,width=1920,height=1080,framerate=30/1” !
nvoverlaysink sync=false
the video frame is abnormal， What‘s wrong.

1
11920×1080 130 KB

#3

Hi,
The nvv4l2decoder only supports JPEGs comporessed from YUV420. You may check your source format by following

#4

Hi, DaneLLL
The information for the camera is as bellow, And 1920x1080,15fps is wanted, so we choose MPJG,1920x1080,30fps as the source format.

ioctl: VIDIOC_ENUM_FMT
    Index       : 0
    Type        : Video Capture
    Pixel Format: 'MJPG' (compressed)
    Name        : Motion-JPEG
            Size: Discrete 1280x720
                    Interval: Discrete 0.033s (30.000 fps)
            Size: Discrete 1920x1080
                    Interval: Discrete 0.033s (30.000 fps)
            Size: Discrete 800x600
                    Interval: Discrete 0.033s (30.000 fps)
            Size: Discrete 640x480
                    Interval: Discrete 0.033s (30.000 fps)
            Size: Discrete 1280x720
                    Interval: Discrete 0.033s (30.000 fps)

    Index       : 1
    Type        : Video Capture
    Pixel Format: 'YUYV'
    Name        : YUYV 4:2:2
            Size: Discrete 1280x720
                    Interval: Discrete 0.100s (10.000 fps)
            Size: Discrete 1920x1080
                    Interval: Discrete 0.200s (5.000 fps)
            Size: Discrete 800x600
                    Interval: Discrete 0.040s (25.000 fps)
            Size: Discrete 640x480
                    Interval: Discrete 0.033s (30.000 fps)
            Size: Discrete 1280x720
                    Interval: Discrete 0.100s (10.000 fps)
#5

Hi,
The JPEGs are compressed from YUYV. The case is not supported in nvv4l2decoder. There is a similar post:

Please refer to the following post of customizing deepstream-app:

#7