On Linux at least cant close than reopen Camera
tesses50 opened this issue · 5 comments
An exception of type 'System.ArgumentException' occurred in System.Private.CoreLib.dll but was not handled in user code: 'FlashCap: Couldn't set video format [3]: DevicePath=/dev/video0'
at FlashCap.Devices.V4L2Device..ctor(String devicePath, VideoCharacteristics characteristics, Boolean transcodeIfYUV, FrameProcessor frameProcessor)
at FlashCap.Devices.V4L2DeviceDescriptor.OpenWithFrameProcessorAsync(VideoCharacteristics characteristics, Boolean transcodeIfYUV, FrameProcessor frameProcessor)
at FlashCap.CaptureDeviceDescriptorExtension.OpenAsync(CaptureDeviceDescriptor descriptor, VideoCharacteristics characteristics, PixelBufferArrivedDelegate pixelBufferArrived)
at MainForm.d__18.MoveNext() in /home/mike/Desktop/TimelapseNow/Timelapse.Desktop/Program.cs:line 294
Works otherwise (as far as I can see)
It appears that the specified format could not be applied to the device.
- What did you choice for video characteristics?
Can I see all the fields of this type? - Could you dump your camera informations by
v4l2-ctl?
For example:
kouji@phenex:~$ sudo v4l2-ctl --all
Driver Info:
Driver name : uvcvideo
Card type : Logitech Webcam C930e
Bus info : usb-0000:00:14.0-4.4
Driver version : 5.13.19
Capabilities : 0x84a00001
Video Capture
Metadata Capture
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x04200001
Video Capture
Streaming
Extended Pix Format
Media Driver Info:
Driver name : uvcvideo
Model : Logitech Webcam C930e
Serial : 15EB897E
Bus info : usb-0000:00:14.0-4.4
Media version : 5.13.19
Hardware revision: 0x00000013 (19)
Driver version : 5.13.19
Interface Info:
ID : 0x03000002
Type : V4L Video
Entity Info:
ID : 0x00000001 (1)
Name : Logitech Webcam C930e
Function : V4L2 I/O
Flags : default
Pad 0x01000007 : 0: Sink
Link 0x02000022: from remote pad 0x100000a of entity 'Processing 3': Data, Enabled, Immutable
Priority: 2
Video input : 0 (Camera 1: ok)
Format Video Capture:
Width/Height : 640/480
Pixel Format : 'YUYV' (YUYV 4:2:2)
Field : None
Bytes per Line : 1280
Size Image : 614400
Colorspace : sRGB
Transfer Function : Rec. 709
YCbCr/HSV Encoding: ITU-R 601
Quantization : Default (maps to Limited Range)
Flags :
Crop Capability Video Capture:
Bounds : Left 0, Top 0, Width 640, Height 480
Default : Left 0, Top 0, Width 640, Height 480
Pixel Aspect: 1/1
Selection Video Capture: crop_default, Left 0, Top 0, Width 640, Height 480, Flags:
Selection Video Capture: crop_bounds, Left 0, Top 0, Width 640, Height 480, Flags:
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 30.000 (30/1)
Read buffers : 0
brightness 0x00980900 (int) : min=0 max=255 step=1 default=128 value=128
contrast 0x00980901 (int) : min=0 max=255 step=1 default=128 value=128
saturation 0x00980902 (int) : min=0 max=255 step=1 default=128 value=128
white_balance_temperature_auto 0x0098090c (bool) : default=1 value=1
gain 0x00980913 (int) : min=0 max=255 step=1 default=0 value=0
power_line_frequency 0x00980918 (menu) : min=0 max=2 default=2 value=2
0: Disabled
1: 50 Hz
2: 60 Hz
white_balance_temperature 0x0098091a (int) : min=2000 max=7500 step=1 default=4000 value=4000 flags=inactive
sharpness 0x0098091b (int) : min=0 max=255 step=1 default=128 value=128
backlight_compensation 0x0098091c (int) : min=0 max=1 step=1 default=0 value=0
exposure_auto 0x009a0901 (menu) : min=0 max=3 default=3 value=3
1: Manual Mode
3: Aperture Priority Mode
exposure_absolute 0x009a0902 (int) : min=3 max=2047 step=1 default=250 value=250 flags=inactive
exposure_auto_priority 0x009a0903 (bool) : default=0 value=1
pan_absolute 0x009a0908 (int) : min=-36000 max=36000 step=3600 default=0 value=0
tilt_absolute 0x009a0909 (int) : min=-36000 max=36000 step=3600 default=0 value=0
focus_absolute 0x009a090a (int) : min=0 max=255 step=5 default=0 value=0 flags=inactive
focus_auto 0x009a090c (bool) : default=1 value=1
zoom_absolute 0x009a090d (int) : min=100 max=400 step=1 default=100 value=100
Oh, I may have misread. Am I correct that the first open to the same device is successful, closed, and then opened again?
For me opening camera first time works (If I close and reopen camera, without restarting program, It crashes when I open it again)
1.4.0 merged and released.