I am running AVLinux with the Liquorix real time Kernel, and I have tried a few programs to record from my Dazzle DVC100 video interface. guvcview was able to find the video feed by itself, but it can't find the audio. I have tried mplayer from the command line, and while I get it to display video with audio (I haven't tried to make it record yet) it works OK for about 7 minutes before it starts buffer overunning. The PC has an Athlon 3100+ and older GForce video card (I think it's a 5500 or 5800) using the nouveau driver. The script that gets me video + audio, but has buffer overruns is:
mplayer tv:// -tv fps=25/1:buffersize=640:driver=v4l2:norm=NTSC:audiorate=44100:immediatemode=0:device=/dev/video0:forceaudio:adevice=/dev/audio1
I found someone had provided a script for someone else, and I modified it to try to find my devices, but I don't understand the meaning of most of these settings, and I don't know what would make things more efficient so I will have enough CPU and hard disk bandwidth.