<code>
lsusb
Bus 001 Device 004: ID 1d19:6109 Dexatek Technology Ltd. 

dmesg
[19998.988100] usb 1-5: new high-speed USB device number 4 using ehci-pci
[19999.138517] usb 1-5: New USB device found, idVendor=1d19, idProduct=6109
[19999.138522] usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[19999.138526] usb 1-5: Product: Video Grabber
[19999.138529] usb 1-5: Manufacturer: DK
[19999.138532] usb 1-5: SerialNumber: 0000000000
[19999.141768] cx231xx 1-5:1.1: New device DK Video Grabber @ 480 Mbps (1d19:6109) with 6 interfaces
[19999.142053] cx231xx 1-5:1.1: Identified as Pixelview Xcapture USB (card=11)
[19999.142404] i2c i2c-8: Added multiplexed i2c bus 10
[19999.142466] i2c i2c-8: Added multiplexed i2c bus 11
[19999.259533] cx25840 7-0044: cx23102 A/V decoder found @ 0x88 (cx231xx #0-0)
[19999.277827] cx25840 7-0044: firmware: direct-loading firmware v4l-cx231xx-avcore-01.fw
[20001.192780] cx25840 7-0044: loaded v4l-cx231xx-avcore-01.fw firmware (16382 bytes)
[20001.226784] cx231xx 1-5:1.1: v4l2 driver version 0.0.3
[20001.323087] cx231xx 1-5:1.1: Registered video device video0 [v4l2]
[20001.323365] cx231xx 1-5:1.1: Registered VBI device vbi0
[20001.323919] cx231xx 1-5:1.1: audio EndPoint Addr 0x83, Alternate settings: 3
[20001.323925] cx231xx 1-5:1.1: video EndPoint Addr 0x84, Alternate settings: 5
[20001.323930] cx231xx 1-5:1.1: VBI EndPoint Addr 0x85, Alternate settings: 2
[20001.323934] cx231xx 1-5:1.1: sliced CC EndPoint Addr 0x86, Alternate settings: 2

ffmpeg -thread_queue_size 64   -f alsa -i hw:1,0  -f video4linux2 -thread_queue_size 64  -i /dev/video0 -s 25 -c:v copy 1d19-6109.mkv 

root@debian:/home/tth# 
</code>


==== Resources ====  

  * http://ftp.us.debian.org/debian/pool/non-free/f/firmware-nonfree/firmware-misc-nonfree_20170823-1_all.deb
  * https://linuxtv.org/wiki/index.php/Conexant_CX2310x
  * https://www.debian-fr.org/t/cle-usb-acquisition/61671/89
  * https://nowardev.wordpress.com/2015/03/24/ffmpeg-and-the-message-thread-message-queue-blocking-consider-raising-the-thread_queue_size-option-current-value-8-alsa-buffer-xrun/