Hi, I've problem with USB grabber WinFast VC100 U.
Grabbing audio over it is OK till video is initialized. It hangs for a
while and then audio input doesn't work till reinserting this USB
grabber but it always repeats.
Tested on two PCs - with PipeWire and PulseAudio.
Tested with OBS, GStreamer
On Windows 7 it works OK but grabbing sw gives bad quality (compression
problem not device's)
$ v4l2-ctl --all
Driver Info:
Driver name : em28xx
Card type : Leadtek VC100
Bus info : usb-0000:00:14.0-1
Driver version : 5.15.23
Capabilities : 0x85220011
Video Capture
VBI Capture
Audio
Read/Write
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x05220001
Video Capture
Audio
Read/Write
Streaming
Extended Pix Format
Priority: 2
Video input : 1 (S-Video: ok)
Audio input : 0 (Line In)
Video Standard = 0x000000ff
PAL-B/B1/G/H/I/D/D1/K
Format Video Capture:
Width/Height : 720/576
Pixel Format : 'YUYV' (YUYV 4:2:2)
Field : Interlaced
Bytes per Line : 1440
Size Image : 829440
Colorspace : SMPTE 170M
Transfer Function : Default (maps to Rec. 709)
YCbCr/HSV Encoding: Default (maps to ITU-R 601)
Quantization : Default (maps to Limited Range)
Flags :
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 25.000 (25/1)
Read buffers : 4
User Controls
brightness 0x00980900 (int) : min=0 max=255
step=1 default=128 value=128 flags=slider
contrast 0x00980901 (int) : min=0 max=255
step=1 default=128 value=128 flags=slider
saturation 0x00980902 (int) : min=0 max=255
step=1 default=128 value=128 flags=slider
hue 0x00980903 (int) : min=-128 max=127
step=1 default=0 value=0 flags=slider
volume 0x00980905 (int) : min=0 max=31
step=1 default=31 value=28 flags=slider
mute 0x00980909 (bool) : default=1 value=0
red_balance 0x0098090e (int) : min=-48 max=48
step=1 default=0 value=0 flags=slider
blue_balance 0x0098090f (int) : min=-48 max=48
step=1 default=0 value=0 flags=slider
sharpness 0x0098091b (int) : min=0 max=15
step=1 default=0 value=0 flags=slider
Image Processing Controls
pixel_rate 0x009f0902 (int64) : min=27000000
max=27000000 step=1 default=27000000 value=27000000 flags=read-only
test_pattern 0x009f0903 (menu) : min=0 max=1
default=0 value=1 (Black screen)
0: Disabled
1: Black screen
