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Python常见问题
作为标题。我想从Logic HD Pro网络摄像头C920获得最高性能，它应该是1920*1080，FPS=30.0。我在网上尝试了很多方法，但都不能解决我的问题。 一般来说，有两种方法可以实现这一目标
- opencv python->；视频捕获：
这是我的密码
cap = cv2.VideoCapture('/dev/video0')
cap.set(cv2.CAP_PROP_FOURCC, cv2.VideoWriter_fourcc(*'MJPG'))
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 1920)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 1080)
问题是，尽管我设置了相机和计算机支持的正确分辨率和格式，但我仍然从相机获得了错误的FPS（结果是1920*1080 FPS=5）。我使用的摄像头是Logic HD Pro网络摄像头C920。下面是相机信息
Index : 0
Type : Video Capture
Pixel Format: 'YUYV'
Name : YUYV 4:2:2
Size: Discrete 640x480
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 160x90
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 160x120
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 176x144
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 320x180
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 320x240
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 352x288
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 432x240
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 800x448
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 800x600
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 864x480
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 960x720
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1024x576
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1280x720
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1600x896
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1920x1080
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 2304x1296
Interval: Discrete 0.500s (2.000 fps)
Size: Discrete 2304x1536
Interval: Discrete 0.500s (2.000 fps)
Index : 2
Type : Video Capture
Pixel Format: 'MJPG' (compressed)
Name : Motion-JPEG
Size: Discrete 640x480
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 160x90
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 160x120
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 176x144
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 320x180
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 320x240
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 352x288
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 432x240
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 800x448
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 800x600
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 864x480
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 960x720
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1024x576
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1280x720
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1600x896
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1920x1080
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.042s (24.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Factory Details:
Rank primary (256)
Long-name Video (video4linux2) Source
Klass Source/Video
Description Reads frames from a Video4Linux2 device
Author Edgard Lima <edgard.lima@gmail.com>, Stefan Kost <ensonic@users.sf.net>
Plugin Details:
Name video4linux2
Description elements for Video 4 Linux
Filename /usr/lib/aarch64-linux-gnu/gstreamer-1.0/libgstvideo4linux2.so
Version 1.14.5
License LGPL
Source module gst-plugins-good
Source release date 2019-05-29
Binary package GStreamer Good Plugins (Ubuntu)
Origin URL https://launchpad.net/distros/ubuntu/+source/gst-plugins-good1.0
GObject
+----GInitiallyUnowned
+----GstObject
+----GstElement
+----GstBaseSrc
+----GstPushSrc
+----GstV4l2Src
Implemented Interfaces:
GstURIHandler
GstTuner
GstColorBalance
GstVideoOrientation
Pad Templates:
SRC template: 'src'
Availability: Always
Capabilities:
image/jpeg
video/mpeg
mpegversion: 4
systemstream: false
video/mpeg
mpegversion: 2
video/mpegts
systemstream: true
video/x-bayer
format: { (string)bggr, (string)gbrg, (string)grbg, (string)rggb }
width: [ 1, 32768 ]
height: [ 1, 32768 ]
framerate: [ 0/1, 2147483647/1 ]
video/x-dv
systemstream: true
video/x-h263
variant: itu
video/x-h264
stream-format: { (string)byte-stream, (string)avc }
alignment: au
video/x-pwc1
width: [ 1, 32768 ]
height: [ 1, 32768 ]
framerate: [ 0/1, 2147483647/1 ]
video/x-pwc2
width: [ 1, 32768 ]
height: [ 1, 32768 ]
framerate: [ 0/1, 2147483647/1 ]
video/x-raw
format: { (string)RGB16, (string)BGR, (string)RGB, (string)GRAY8, (string)GRAY16_LE, (string)GRAY16_BE, (string)YVU9, (string)YV12, (string)YUY2, (string)YVYU, (string)UYVY, (string)Y42B, (string)Y41B, (string)YUV9, (string)NV12_64Z32, (string)NV24, (string)NV61, (string)NV16, (string)NV21, (string)NV12, (string)I420, (string)BGRA, (string)BGRx, (string)ARGB, (string)xRGB, (string)BGR15, (string)RGB15 }
width: [ 1, 32768 ]
height: [ 1, 32768 ]
framerate: [ 0/1, 2147483647/1 ]
video/x-sonix
width: [ 1, 32768 ]
height: [ 1, 32768 ]
framerate: [ 0/1, 2147483647/1 ]
video/x-vp8
video/x-vp9
video/x-wmv
wmvversion: 3
format: WVC1
Element has no clocking capabilities.
URI handling capabilities:
Element can act as source.
Supported URI protocols:
v4l2
Pads:
SRC: 'src'
Pad Template: 'src'
Element Properties:
name : The name of the object
flags: readable, writable
String. Default: "v4l2src0"
parent : The parent of the object
flags: readable, writable
Object of type "GstObject"
blocksize : Size in bytes to read per buffer (-1 = default)
flags: readable, writable
Unsigned Integer. Range: 0 - 4294967295 Default: 4096
num-buffers : Number of buffers to output before sending EOS (-1 = unlimited)
flags: readable, writable
Integer. Range: -1 - 2147483647 Default: -1
typefind : Run typefind before negotiating (deprecated, non-functional)
flags: readable, writable, deprecated
Boolean. Default: false
do-timestamp : Apply current stream time to buffers
flags: readable, writable
Boolean. Default: false
device : Device location
flags: readable, writable
String. Default: "/dev/video0"
device-name : Name of the device
flags: readable
String. Default: null
device-fd : File descriptor of the device
flags: readable
Integer. Range: -1 - 2147483647 Default: -1
flags : Device type flags
flags: readable
Flags "GstV4l2DeviceTypeFlags" Default: 0x00000000, "(none)"
(0x00000001): capture - Device supports video capture
(0x00000002): output - Device supports video playback
(0x00000004): overlay - Device supports video overlay
(0x00000010): vbi-capture - Device supports the VBI capture
(0x00000020): vbi-output - Device supports the VBI output
(0x00010000): tuner - Device has a tuner or modulator
(0x00020000): audio - Device has audio inputs or outputs
brightness : Picture brightness, or more precisely, the black level
flags: readable, writable, controllable
Integer. Range: -2147483648 - 2147483647 Default: 0
contrast : Picture contrast or luma gain
flags: readable, writable, controllable
Integer. Range: -2147483648 - 2147483647 Default: 0
saturation : Picture color saturation or chroma gain
flags: readable, writable, controllable
Integer. Range: -2147483648 - 2147483647 Default: 0
hue : Hue or color balance
flags: readable, writable, controllable
Integer. Range: -2147483648 - 2147483647 Default: 0
norm : video standard
flags: readable, writable
Enum "V4L2_TV_norms" Default: 0, "none"
(0): none - none
(45056): NTSC - NTSC
(4096): NTSC-M - NTSC-M
(8192): NTSC-M-JP - NTSC-M-JP
(32768): NTSC-M-KR - NTSC-M-KR
(16384): NTSC-443 - NTSC-443
(255): PAL - PAL
(7): PAL-BG - PAL-BG
(1): PAL-B - PAL-B
(2): PAL-B1 - PAL-B1
(4): PAL-G - PAL-G
(8): PAL-H - PAL-H
(16): PAL-I - PAL-I
(224): PAL-DK - PAL-DK
(32): PAL-D - PAL-D
(64): PAL-D1 - PAL-D1
(128): PAL-K - PAL-K
(256): PAL-M - PAL-M
(512): PAL-N - PAL-N
(1024): PAL-Nc - PAL-Nc
(2048): PAL-60 - PAL-60
(16711680): SECAM - SECAM
(65536): SECAM-B - SECAM-B
(262144): SECAM-G - SECAM-G
(524288): SECAM-H - SECAM-H
(3276800): SECAM-DK - SECAM-DK
(131072): SECAM-D - SECAM-D
(1048576): SECAM-K - SECAM-K
(2097152): SECAM-K1 - SECAM-K1
(4194304): SECAM-L - SECAM-L
(8388608): SECAM-Lc - SECAM-Lc
io-mode : I/O mode
flags: readable, writable
Enum "GstV4l2IOMode" Default: 0, "auto"
(0): auto - GST_V4L2_IO_AUTO
(1): rw - GST_V4L2_IO_RW
(2): mmap - GST_V4L2_IO_MMAP
(3): userptr - GST_V4L2_IO_USERPTR
(4): dmabuf - GST_V4L2_IO_DMABUF
(5): dmabuf-import - GST_V4L2_IO_DMABUF_IMPORT
extra-controls : Extra v4l2 controls (CIDs) for the device
flags: readable, writable
Boxed pointer of type "GstStructure"
pixel-aspect-ratio : Overwrite the pixel aspect ratio of the device
flags: readable, writable
String. Default: null
force-aspect-ratio : When enabled, the pixel aspect ratio will be enforced
flags: readable, writable
Boolean. Default: true
Element Signals:
"prepare-format" : void user_function (GstElement* object,
gint arg0,
GstCaps* arg1,
gpointer user_data);
- Gstreamer
这是我的代码，它也不起作用。除非删除pixelformat，并设置width=2304,height=1536,framerate=2/1
gst_str = 'v4l2src device=/dev/video0 ! '
'video/x-raw, pixelformat=2, width=1920, height=1080, framerate=30/1 ! '
'videoconvert ! appsink'
cap = cv2.VideoCapture(gst_str, cv2.CAP_GSTREAMER)
这已经困扰了我很长时间。我真想知道如何从UVC设备中获得正确的分辨率、fps和格式。如果有人能解决这个问题并告诉我发生了什么，我将非常感激
Tags： thedefaultsizestringdevicevideoflagsfps
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