Hallo Lence,
was sagt den die Ausgabe im Putty:
lsusb
und
dmesg | grep -i video
hier sollte der Grabber zu finden sein
So sieht es bei mir aus:
[root@raspberrypi ~]$ lsusb
Bus 001 Device 004: ID 1b71:3002 Fushicai USBTV007 Video Grabber [EasyCAP]
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
[root@raspberrypi ~]$ dmesg | grep -i video
[ 1.362683] vc-sm: Videocore shared memory driver
[ 6.361546] bcm2835_vc_sm_cma_probe: Videocore shared memory driver
[ 6.451182] videodev: Linux video capture interface: v2.00
[ 6.537574] bcm2835-isp bcm2835-isp: Device node output[0] registered as /dev/video13
[ 6.540928] bcm2835-isp bcm2835-isp: Device node capture[0] registered as /dev/video14
[ 6.541422] bcm2835-isp bcm2835-isp: Device node capture[1] registered as /dev/video15
[ 6.541752] bcm2835-isp bcm2835-isp: Device node stats[2] registered as /dev/video16
[ 6.586147] bcm2835-codec bcm2835-codec: Device registered as /dev/video10
[ 6.593381] bcm2835-codec bcm2835-codec: Device registered as /dev/video11
[ 6.601731] bcm2835-codec bcm2835-codec: Device registered as /dev/video12
[ 7.049713] usbtv 1-1.2:1.0: Fushicai USBTV007 Audio-Video Grabber
Sollte das nicht funktionieren und so aussehen, versuch mal den Stick am Windows Rechner zu testen