Does the software support NV12, YUY2, I420, or RGB24? If your capture card outputs NV12 (common for HD) but the software demands RGB, the CPU must convert colors, causing lag.
If you specify the exact make and model of your AV card and the OS you’re using (Windows/Linux/macOS), I can provide a more tailored solution. av card receiver software
Best for: VHS digitization, old gaming consoles (PS2, N64), and CCTV. Price: Free. Does the software support NV12, YUY2, I420, or RGB24
Modern software often fails with interlaced composite video. VirtualDub (with the capture module) allows you to tweak vertical blank interval timing and codec settings that modern apps ignore. Does the software support NV12