Hi Jiri, On 30/10/2018 14:36, Jiri Slaby wrote: > Hi, > > I have a Dell Lattitude 7280 with two webcams. The standard one works > fine (/dev/video0). The other one is an IR camera (/dev/video1). The > camera proper works fine and produces 340x374 frames. But there is an IR > led supposed to light the object. The video is 30fps, but the LED seems > to emit light only on half of the frames, i.e. on every second frame (15 > fps). This makes the video blink a lot. The two consecutive frames look > like: > https://www.fi.muni.cz/~xslaby/sklad/mpv-shot0002.jpg > https://www.fi.muni.cz/~xslaby/sklad/mpv-shot0003.jpg > > Do you have any ideas what to check/test? I have an HP Spectre with IR camera, and it also 'flashes' alternate frames. I assumed this was something to do with controlling the lighting for face recognition some how. I'm fairly sure we don't control the 'IR flash' from the UVC. I wonder if there is a control parameter for the IR led in the extension-units? -- Regards Kieran > $ v4l2-ctl --all -d /dev/video2 > Driver Info (not using libv4l2): > Driver name : uvcvideo > Card type : Integrated_Webcam_HD: Integrate > Bus info : usb-0000:00:14.0-5 > Driver version: 4.18.15 > Capabilities : 0x84A00001 > Video Capture > Metadata Capture > Streaming > Extended Pix Format > Device Capabilities > Device Caps : 0x04200001 > Video Capture > Streaming > Extended Pix Format > Priority: 2 > Video input : 0 (Camera 11: ok) > Format Video Capture: > Width/Height : 340/374 > Pixel Format : 'YUYV' > Field : None > Bytes per Line : 680 > Size Image : 254320 > Colorspace : sRGB > Transfer Function : Default (maps to sRGB) > YCbCr/HSV Encoding: Default (maps to ITU-R 601) > Quantization : Default (maps to Limited Range) > Flags : > Crop Capability Video Capture: > Bounds : Left 0, Top 0, Width 340, Height 374 > Default : Left 0, Top 0, Width 340, Height 374 > Pixel Aspect: 1/1 > Selection: crop_default, Left 0, Top 0, Width 340, Height 374 > Selection: crop_bounds, Left 0, Top 0, Width 340, Height 374 > Streaming Parameters Video Capture: > Capabilities : timeperframe > Frames per second: 30.000 (30/1) > Read buffers : 0 > > > > > > $ lsusb -vs 1:3 > Bus 001 Device 003: ID 0bda:5691 Realtek Semiconductor Corp. > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 239 Miscellaneous Device > bDeviceSubClass 2 > bDeviceProtocol 1 Interface Association > bMaxPacketSize0 64 > idVendor 0x0bda Realtek Semiconductor Corp. > idProduct 0x5691 > bcdDevice 60.12 > iManufacturer 3 CNFGE16N5214300025C2 > iProduct 1 Integrated_Webcam_HD > iSerial 2 0001 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 1041 > bNumInterfaces 4 > bConfigurationValue 1 > iConfiguration 4 USB Camera > bmAttributes 0x80 > (Bus Powered) > MaxPower 500mA > ** UNRECOGNIZED: 28 ff 42 49 53 54 00 01 06 06 10 00 00 00 00 00 01 > 07 f4 01 02 08 f4 01 03 09 f4 01 04 0a f4 01 05 0b f4 01 06 0c e8 03 > Interface Association: > bLength 8 > bDescriptorType 11 > bFirstInterface 0 > bInterfaceCount 2 > bFunctionClass 14 Video > bFunctionSubClass 3 Video Interface Collection > bFunctionProtocol 0 > iFunction 5 Integrated Webcam > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 1 Video Control > bInterfaceProtocol 0 > iInterface 5 Integrated Webcam > VideoControl Interface Descriptor: > bLength 13 > bDescriptorType 36 > bDescriptorSubtype 1 (HEADER) > bcdUVC 1.00 > wTotalLength 107 > dwClockFrequency 15.000000MHz > bInCollection 1 > baInterfaceNr( 0) 1 > VideoControl Interface Descriptor: > bLength 18 > bDescriptorType 36 > bDescriptorSubtype 2 (INPUT_TERMINAL) > bTerminalID 1 > wTerminalType 0x0201 Camera Sensor > bAssocTerminal 0 > iTerminal 0 > wObjectiveFocalLengthMin 0 > wObjectiveFocalLengthMax 0 > wOcularFocalLength 0 > bControlSize 3 > bmControls 0x0000000e > Auto-Exposure Mode > Auto-Exposure Priority > Exposure Time (Absolute) > VideoControl Interface Descriptor: > bLength 11 > bDescriptorType 36 > bDescriptorSubtype 5 (PROCESSING_UNIT) > Warning: Descriptor too short > bUnitID 2 > bSourceID 1 > wMaxMultiplier 0 > bControlSize 2 > bmControls 0x0000177f > Brightness > Contrast > Hue > Saturation > Sharpness > Gamma > White Balance Temperature > Backlight Compensation > Gain > Power Line Frequency > White Balance Temperature, Auto > iProcessing 0 > bmVideoStandards 0x09 > None > SECAM - 625/50 > VideoControl Interface Descriptor: > bLength 9 > bDescriptorType 36 > bDescriptorSubtype 3 (OUTPUT_TERMINAL) > bTerminalID 3 > wTerminalType 0x0101 USB Streaming > bAssocTerminal 0 > bSourceID 4 > iTerminal 0 > VideoControl Interface Descriptor: > bLength 27 > bDescriptorType 36 > bDescriptorSubtype 6 (EXTENSION_UNIT) > bUnitID 4 > guidExtensionCode {1229a78c-47b4-4094-b0ce-db07386fb938} > bNumControl 2 > bNrPins 1 > baSourceID( 0) 7 > bControlSize 2 > bmControls( 0) 0x00 > bmControls( 1) 0x06 > iExtension 0 > VideoControl Interface Descriptor: > bLength 29 > bDescriptorType 36 > bDescriptorSubtype 6 (EXTENSION_UNIT) > bUnitID 7 > guidExtensionCode {0fb885c3-68c2-4547-90f7-8f47579d95fc} > bNumControl 0 > bNrPins 1 > baSourceID( 0) 2 > bControlSize 4 > bmControls( 0) 0x0f > bmControls( 1) 0x00 > bmControls( 2) 0x00 > bmControls( 3) 0x00 > iExtension 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x83 EP 3 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0010 1x 16 bytes > bInterval 6 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 0 > bNumEndpoints 0 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > bInterfaceProtocol 0 > iInterface 0 > VideoStreaming Interface Descriptor: > bLength 15 > bDescriptorType 36 > bDescriptorSubtype 1 (INPUT_HEADER) > bNumFormats 2 > wTotalLength 395 > bEndPointAddress 129 > bmInfo 0 > bTerminalLink 3 > bStillCaptureMethod 1 > bTriggerSupport 1 > bTriggerUsage 0 > bControlSize 1 > bmaControls( 0) 0 > bmaControls( 1) 0 > VideoStreaming Interface Descriptor: > bLength 11 > bDescriptorType 36 > bDescriptorSubtype 6 (FORMAT_MJPEG) > bFormatIndex 1 > bNumFrameDescriptors 5 > bFlags 1 > Fixed-size samples: Yes > bDefaultFrameIndex 1 > bAspectRatioX 0 > bAspectRatioY 0 > bmInterlaceFlags 0x00 > Interlaced stream or variable: No > Fields per frame: 1 fields > Field 1 first: No > Field pattern: Field 1 only > bCopyProtect 0 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 1 > bmCapabilities 0x01 > Still image supported > wWidth 640 > wHeight 480 > dwMinBitRate 147456000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 2 > bmCapabilities 0x01 > Still image supported > wWidth 1280 > wHeight 720 > dwMinBitRate 442368000 > dwMaxBitRate 442368000 > dwMaxVideoFrameBufferSize 1843200 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 3 > bmCapabilities 0x01 > Still image supported > wWidth 960 > wHeight 540 > dwMinBitRate 248832000 > dwMaxBitRate 248832000 > dwMaxVideoFrameBufferSize 1036800 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 4 > bmCapabilities 0x01 > Still image supported > wWidth 848 > wHeight 480 > dwMinBitRate 195379200 > dwMaxBitRate 195379200 > dwMaxVideoFrameBufferSize 814080 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 5 > bmCapabilities 0x01 > Still image supported > wWidth 640 > wHeight 360 > dwMinBitRate 110592000 > dwMaxBitRate 110592000 > dwMaxVideoFrameBufferSize 460800 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > 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)) > VideoStreaming Interface Descriptor: > bLength 27 > bDescriptorType 36 > bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED) > bFormatIndex 2 > bNumFrameDescriptors 6 > guidFormat > {32595559-0000-0010-8000-00aa00389b71} > bBitsPerPixel 16 > bDefaultFrameIndex 1 > bAspectRatioX 0 > bAspectRatioY 0 > bmInterlaceFlags 0x00 > Interlaced stream or variable: No > Fields per frame: 2 fields > Field 1 first: No > Field pattern: Field 1 only > bCopyProtect 0 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 1 > bmCapabilities 0x01 > Still image supported > wWidth 640 > wHeight 480 > dwMinBitRate 147456000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 2 > bmCapabilities 0x01 > Still image supported > wWidth 640 > wHeight 360 > dwMinBitRate 110592000 > dwMaxBitRate 110592000 > dwMaxVideoFrameBufferSize 460800 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 3 > bmCapabilities 0x01 > Still image supported > wWidth 424 > wHeight 240 > dwMinBitRate 48844800 > dwMaxBitRate 48844800 > dwMaxVideoFrameBufferSize 203520 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 4 > bmCapabilities 0x01 > Still image supported > wWidth 320 > wHeight 240 > dwMinBitRate 36864000 > dwMaxBitRate 36864000 > dwMaxVideoFrameBufferSize 153600 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 5 > bmCapabilities 0x01 > Still image supported > wWidth 320 > wHeight 180 > dwMinBitRate 27648000 > dwMaxBitRate 27648000 > dwMaxVideoFrameBufferSize 115200 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 6 > bmCapabilities 0x01 > Still image supported > wWidth 160 > wHeight 120 > dwMinBitRate 9216000 > dwMaxBitRate 9216000 > dwMaxVideoFrameBufferSize 38400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > 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 0x0080 1x 128 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 0x0200 1x 512 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 0x0400 1x 1024 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 0x0b00 2x 768 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 0x0c00 2x 1024 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 0x13aa 3x 938 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 0x1400 3x 1024 bytes > bInterval 1 > Interface Association: > bLength 8 > bDescriptorType 11 > bFirstInterface 2 > bInterfaceCount 2 > bFunctionClass 14 Video > bFunctionSubClass 3 Video Interface Collection > bFunctionProtocol 0 > iFunction 6 Integrated Webcam > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 2 > bAlternateSetting 0 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 1 Video Control > bInterfaceProtocol 0 > iInterface 6 Integrated Webcam > VideoControl Interface Descriptor: > bLength 13 > bDescriptorType 36 > bDescriptorSubtype 1 (HEADER) > bcdUVC 1.00 > wTotalLength 103 > dwClockFrequency 15.000000MHz > bInCollection 1 > baInterfaceNr( 0) 3 > VideoControl Interface Descriptor: > bLength 18 > bDescriptorType 36 > bDescriptorSubtype 2 (INPUT_TERMINAL) > bTerminalID 11 > wTerminalType 0x0201 Camera Sensor > bAssocTerminal 0 > iTerminal 0 > wObjectiveFocalLengthMin 0 > wObjectiveFocalLengthMax 0 > wOcularFocalLength 0 > bControlSize 3 > bmControls 0x00000000 > VideoControl Interface Descriptor: > bLength 11 > bDescriptorType 36 > bDescriptorSubtype 5 (PROCESSING_UNIT) > Warning: Descriptor too short > bUnitID 9 > bSourceID 11 > wMaxMultiplier 0 > bControlSize 2 > bmControls 0x00000000 > iProcessing 0 > bmVideoStandards 0x09 > None > SECAM - 625/50 > VideoControl Interface Descriptor: > bLength 9 > bDescriptorType 36 > bDescriptorSubtype 3 (OUTPUT_TERMINAL) > bTerminalID 8 > wTerminalType 0x0101 USB Streaming > bAssocTerminal 0 > bSourceID 10 > iTerminal 0 > VideoControl Interface Descriptor: > bLength 25 > bDescriptorType 36 > bDescriptorSubtype 6 (EXTENSION_UNIT) > bUnitID 12 > guidExtensionCode {45b5da73-23c1-4a3d-a368-610f078c4397} > bNumControl 0 > bNrPins 1 > baSourceID( 0) 9 > bControlSize 0 > iExtension 0 > VideoControl Interface Descriptor: > bLength 27 > bDescriptorType 36 > bDescriptorSubtype 6 (EXTENSION_UNIT) > bUnitID 10 > guidExtensionCode {1229a78c-47b4-4094-b0ce-db07386fb938} > bNumControl 2 > bNrPins 1 > baSourceID( 0) 12 > bControlSize 2 > bmControls( 0) 0x00 > bmControls( 1) 0x06 > iExtension 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x85 EP 5 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0010 1x 16 bytes > bInterval 6 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 0 > bNumEndpoints 0 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > bInterfaceProtocol 0 > iInterface 0 > VideoStreaming Interface Descriptor: > bLength 14 > bDescriptorType 36 > bDescriptorSubtype 1 (INPUT_HEADER) > bNumFormats 1 > wTotalLength 87 > bEndPointAddress 130 > bmInfo 0 > bTerminalLink 8 > bStillCaptureMethod 2 > bTriggerSupport 1 > bTriggerUsage 0 > bControlSize 1 > bmaControls( 0) 0 > VideoStreaming Interface Descriptor: > bLength 27 > bDescriptorType 36 > bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED) > bFormatIndex 1 > bNumFrameDescriptors 1 > guidFormat > {32595559-0000-0010-8000-00aa00389b71} > bBitsPerPixel 16 > bDefaultFrameIndex 1 > bAspectRatioX 0 > bAspectRatioY 0 > bmInterlaceFlags 0x00 > Interlaced stream or variable: No > Fields per frame: 2 fields > Field 1 first: No > Field pattern: Field 1 only > bCopyProtect 0 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 1 > bmCapabilities 0x00 > Still image unsupported > wWidth 340 > wHeight 374 > dwMinBitRate 61036800 > dwMaxBitRate 61036800 > dwMaxVideoFrameBufferSize 254320 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 10 > bDescriptorType 36 > bDescriptorSubtype 3 (STILL_IMAGE_FRAME) > bEndpointAddress 0 > bNumImageSizePatterns 1 > wWidth( 0) 340 > wHeight( 0) 374 > bNumCompressionPatterns 0 > 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 3 > bAlternateSetting 1 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > bInterfaceProtocol 0 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 5 > Transfer Type Isochronous > Synch Type Asynchronous > Usage Type Data > wMaxPacketSize 0x0080 1x 128 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 2 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > bInterfaceProtocol 0 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 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 3 > bAlternateSetting 3 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > bInterfaceProtocol 0 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 5 > Transfer Type Isochronous > Synch Type Asynchronous > Usage Type Data > wMaxPacketSize 0x0400 1x 1024 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 4 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > bInterfaceProtocol 0 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 5 > Transfer Type Isochronous > Synch Type Asynchronous > Usage Type Data > wMaxPacketSize 0x0b00 2x 768 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 5 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > bInterfaceProtocol 0 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 5 > Transfer Type Isochronous > Synch Type Asynchronous > Usage Type Data > wMaxPacketSize 0x0c00 2x 1024 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 6 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > bInterfaceProtocol 0 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 5 > Transfer Type Isochronous > Synch Type Asynchronous > Usage Type Data > wMaxPacketSize 0x13aa 3x 938 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 7 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > bInterfaceProtocol 0 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 5 > Transfer Type Isochronous > Synch Type Asynchronous > Usage Type Data > wMaxPacketSize 0x1400 3x 1024 bytes > bInterval 1 > Device Qualifier (for other device speed): > bLength 10 > bDescriptorType 6 > bcdUSB 2.00 > bDeviceClass 239 Miscellaneous Device > bDeviceSubClass 2 > bDeviceProtocol 1 Interface Association > bMaxPacketSize0 64 > bNumConfigurations 1 > Device Status: 0x0000 > (Bus Powered) > > > > thanks, >
