You'll need a pretty beefy video capture card, ideally one that accepts HD (progressive) input (720p or more)
The main obstacle, like you said, is going to be latency. Unfortunately your choice of cable isn't going to make a difference on that. The latency is caused by the buffer(s) on the card itself. Generally better cards have lower latency.
Another problem you'll likely face if you use a standard video capture card & analogue signal, is that the screenshots will be interlaced. You can solve that by running them through something like Photoshops 'deinterlace' filter. |