Camera
試圖讓我的 USB c920 網路攝像頭的預設選擇在 Gstreamer 中工作，但仍會打開筆記型電腦內部攝像頭
在過去的一周裡，我一直試圖讓我的 Logitech c920 作為我的預設網路攝像頭。儘管一切似乎都井井有條，但它只是不起作用。
我安裝了 GUVCview 和 V4L。我安裝了 Gstreamer 和多媒體選擇器。在多媒體選擇器中，我選擇了 c920 作為我的預設網路攝像頭。我通過執行 root 到達那裡
$ sudo gstreamer-properties但是，當我打開 G 聊天/環聊或 GUVCview 時，它仍然會打開我的筆記型電腦螢幕攝像頭，我必須選擇“新建”或“重新啟動”才能打開外部攝像頭。執行後我收到此消息
sudo gstreamer-properties(gstreamer-properties:2885): Gtk-WARNING **: Unknown property: GtkDialog.has-separator (gstreamer-properties:2885): Gtk-WARNING **: Unknown property: GtkDialog.has-separator gstreamer-properties-Message: Skipping unavailable plugin 'artsdsink' gstreamer-properties-Message: Skipping unavailable plugin 'esdsink' gstreamer-properties-Message: Skipping unavailable plugin 'sunaudiosink' gstreamer-properties-Message: Skipping unavailable plugin 'glimagesink' gstreamer-properties-Message: Skipping unavailable plugin 'v4lmjpegsrc' gstreamer-properties-Message: Skipping unavailable plugin 'qcamsrc' gstreamer-properties-Message: Skipping unavailable plugin 'v4lsrc' gstreamer-properties-Message: Skipping unavailable plugin 'esdmon' gstreamer-properties-Message: Skipping unavailable plugin 'sunaudiosrc'
- 這些不可用的外掛會不會是問題所在？
- 會不會是某個地方的設置不好？
我在跑：
- 東芝 Satellite L755 上的 Windows 7 和 Ubuntu 12.04 LTS
- 記憶體：3.8 Gib
- 處理器：Intel® Core™ i5-2410M CPU @ 2.30GHz × 4
- 顯卡：英特爾® Sandybridge Mobile
- 作業系統類型 64 位
- 磁碟：40.2 GB
編輯#1：執行後終端上的讀數
lsusb和lusub -tmike@Mike-Ubuntu12:~$ lsusb Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 04f2:b289 Chicony Electronics Co., Ltd Bus 002 Device 003: ID 046d:082d Logitech, Inc. mike@Mike-Ubuntu12:~$ lsusb -t /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M |__ Port 2: Dev 3, If 0, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M |__ Port 2: Dev 3, If 1, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M |__ Port 2: Dev 3, If 2, Class=audio, Driver=snd-usb-audio, 480M |__ Port 2: Dev 3, If 3, Class=audio, Driver=snd-usb-audio, 480M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M |__ Port 4: Dev 3, If 0, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M |__ Port 4: Dev 3, If 1, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M編輯＃2：
$ lsusb -vv dwMaxVideoFrameBufferSize 1179648 dwDefaultFrameInterval 333333 bFrameIntervalType 7 dwFrameInterval( 0) 333333 dwFrameInterval( 1) 416666 dwFrameInterval( 2) 500000 dwFrameInterval( 3) 666666 dwFrameInterval( 4) 1000000 dwFrameInterval( 5) 1333333 dwFrameInterval( 6) 2000000 VideoStreaming Interface Descriptor: bLength 54 bDescriptorType 36 bDescriptorSubtype 7 (FRAME_MJPEG) bFrameIndex 15 bmCapabilities 0x00 Still image unsupported wWidth 1280 wHeight 720 dwMinBitRate 73728000 dwMaxBitRate 442368000 dwMaxVideoFrameBufferSize 1843200 dwDefaultFrameInterval 333333 bFrameIntervalType 7 dwFrameInterval( 0) 333333 dwFrameInterval( 1) 416666 dwFrameInterval( 2) 500000 dwFrameInterval( 3) 666666 dwFrameInterval( 4) 1000000 dwFrameInterval( 5) 1333333 dwFrameInterval( 6) 2000000 VideoStreaming Interface Descriptor: bLength 54 bDescriptorType 36 bDescriptorSubtype 7 (FRAME_MJPEG) bFrameIndex 16 bmCapabilities 0x00 Still image unsupported wWidth 1600 wHeight 896 dwMinBitRate 114688000 dwMaxBitRate 688128000 dwMaxVideoFrameBufferSize 2867200 dwDefaultFrameInterval 333333 bFrameIntervalType 7 dwFrameInterval( 0) 333333 dwFrameInterval( 1) 416666 dwFrameInterval( 2) 500000 dwFrameInterval( 3) 666666 dwFrameInterval( 4) 1000000 dwFrameInterval( 5) 1333333 dwFrameInterval( 6) 2000000 VideoStreaming Interface Descriptor: bLength 54 bDescriptorType 36 bDescriptorSubtype 7 (FRAME_MJPEG) bFrameIndex 17 bmCapabilities 0x00 Still image unsupported wWidth 1920 wHeight 1080 dwMinBitRate 165888000 dwMaxBitRate 995328000 dwMaxVideoFrameBufferSize 4147200 dwDefaultFrameInterval 333333 bFrameIntervalType 7 dwFrameInterval( 0) 333333 dwFrameInterval( 1) 416666 dwFrameInterval( 2) 500000 dwFrameInterval( 3) 666666 dwFrameInterval( 4) 1000000 dwFrameInterval( 5) 1333333 dwFrameInterval( 6) 2000000 VideoStreaming Interface Descriptor: bLength 6 bDescriptorType 36 bDescriptorSubtype 13 (COLORFORMAT) bColorPrimaries 1 (BT.709,sRGB) bTransferCharacteristics 1 (BT.709) bMatrixCoefficients 4 (SMPTE 170M (BT.601)) Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x00c0 1x 192 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 2 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0180 1x 384 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 3 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 4 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0280 1x 640 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 5 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0320 1x 800 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 6 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x03b0 1x 944 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 7 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0a80 2x 640 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 8 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0b20 2x 800 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 9 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0be0 2x 992 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 10 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x1380 3x 896 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 11 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x13fc 3x 1020 bytes bInterval 1 Interface Association: bLength 8 bDescriptorType 11 bFirstInterface 2 bInterfaceCount 2 bFunctionClass 1 Audio bFunctionSubClass 2 Streaming bFunctionProtocol 0 iFunction 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 1 Control Device bInterfaceProtocol 0 iInterface 0 AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 1 (HEADER) bcdADC 1.00 wTotalLength 38 bInCollection 1 baInterfaceNr( 0) 3 AudioControl Interface Descriptor: bLength 12 bDescriptorType 36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 1 wTerminalType 0x0201 Microphone bAssocTerminal 0 bNrChannels 1 wChannelConfig 0x0003 Left Front (L) Right Front (R) iChannelNames 0 iTerminal 0 AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 3 (OUTPUT_TERMINAL) bTerminalID 3 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bSourceID 5 iTerminal 0 AudioControl Interface Descriptor: bLength 8 bDescriptorType 36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 5 bSourceID 1 bControlSize 1 bmaControls( 0) 0x03 Mute Control Volume Control iFeature 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 AudioStreaming Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 3 bDelay 255 frames wFormatTag 1 PCM AudioStreaming Interface Descriptor: bLength 11 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 2 bSubframeSize 2 bBitResolution 16 bSamFreqType 1 Discrete tSamFreq[ 0] 16000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0044 1x 68 bytes bInterval 4 bRefresh 0 bSynchAddress 0 AudioControl Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 0 Undefined wLockDelay 0 Undefined Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 2 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 AudioStreaming Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 3 bDelay 255 frames wFormatTag 1 PCM AudioStreaming Interface Descriptor: bLength 11 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 2 bSubframeSize 2 bBitResolution 16 bSamFreqType 1 Discrete tSamFreq[ 0] 24000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0064 1x 100 bytes bInterval 4 bRefresh 0 bSynchAddress 0 AudioControl Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 0 Undefined wLockDelay 0 Undefined Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 3 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 AudioStreaming Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 3 bDelay 255 frames wFormatTag 1 PCM AudioStreaming Interface Descriptor: bLength 11 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 2 bSubframeSize 2 bBitResolution 16 bSamFreqType 1 Discrete tSamFreq[ 0] 32000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0084 1x 132 bytes bInterval 4 bRefresh 0 bSynchAddress 0 AudioControl Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 0 Undefined wLockDelay 0 Undefined編輯 #3 - 1 月 5 日：
$ for i in /sys/bus/usb/devices/*/id{Vendor,Product}; do \ echo -n "$i | "; cat $i; done | sort | column -t /sys/bus/usb/devices/1-1.4/idProduct | b289 /sys/bus/usb/devices/1-1.4/idVendor | 04f2第二次編輯：
$ cat /sys/bus/usb/devices/1-1.4/bConfigurationValue 1第三次編輯
$ sudo su -c 'echo "0" > /sys/bus/usb/devices/1-1.4/bConfigurationValue'
採用此 AU Q&A 中概述的方法，標題為：如何禁用集成網路攝像頭並仍然能夠使用外部網路攝像頭，我相信您可以像這樣禁用內置攝像頭。
例子
（以我現在執行 Fedora 19 的 Thinkpad T410 筆記型電腦為例）
第 1 步：
lsusb從輸出開始。$ lsusb Bus 002 Device 004: ID 17ef:1003 Lenovo Integrated Smart Card Reader Bus 002 Device 003: ID 046d:c521 Logitech, Inc. Cordless Mouse Receiver Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub**第 2 步：**您可以像這樣執行相應的命令來查找上述設備的所有
idProducts&idVendor數字，產生如下輸出：$ for i in /sys/bus/usb/devices/*/id{Vendor,Product};do \ echo -n "$i | "; cat $i; done | sort | column -t /sys/bus/usb/devices/1-1/idProduct | 0020 /sys/bus/usb/devices/1-1/idVendor | 8087 /sys/bus/usb/devices/2-1.1/idProduct | c521 /sys/bus/usb/devices/2-1.1/idVendor | 046d /sys/bus/usb/devices/2-1.5/idProduct | 1003 /sys/bus/usb/devices/2-1.5/idVendor | 17ef /sys/bus/usb/devices/2-1/idProduct | 0020 /sys/bus/usb/devices/2-1/idVendor | 8087 /sys/bus/usb/devices/usb1/idProduct | 0002 /sys/bus/usb/devices/usb1/idVendor | 1d6b /sys/bus/usb/devices/usb2/idProduct | 0002 /sys/bus/usb/devices/usb2/idVendor | 1d6b所以我們可以通過這個列表並在輸出中找到相同設備的對應
idVendor和編號。idProduct``lsusb**第 3 步：**選擇我的無線滑鼠：
Bus 002 Device 003: ID 046d:c521 Logitech, Inc. Cordless Mouse Receiver這些行是相應的
/sys行：/sys/bus/usb/devices/2-1.1/idProduct | c521 /sys/bus/usb/devices/2-1.1/idVendor | 046d所以我們現在知道羅技滑鼠是這個設備下
/sys：/sys/bus/usb/devices/2-1.1**第 4 步：**我們可以通過查看它的
bConfigurationValue.$ cat /sys/bus/usb/devices/2-1.1/bConfigurationValue 1要禁用 USB 設備，我們可以將此值設置為
0：$ sudo su -c 'echo "0" > /sys/bus/usb/devices/2-1.1/bConfigurationValue'神奇的是，我的滑鼠現在被禁用了。要重新啟用它：
$ sudo su -c 'echo "1" > /sys/bus/usb/devices/2-1.1/bConfigurationValue'**注意：**這種精確的方法可以應用於任何 USB 設備，例如您的內置攝像頭。
Guvcview 仍然沒有預設顯示外部攝像頭？
如果您查看顯示以下說明
guvcview的幫助。--help-d, --device=VIDEO_DEVICE Video Device to use [default: /dev/video0]因此，即使我們進行了上述更改，除非外部攝像頭顯示為
/dev/video0，guvcview否則不會將此輔助攝像頭視為“預設”影片設備。我想我會傾向於改變策略，只
guvcview用我想讓它使用的任何設備打電話，而不是為禁用內置攝像頭而煩惱。