Capture analogue to DV Tape realtime - Possible?

I use the MainConcept DV codec. For it's compression ratio I prefer the quality it to MJPEG (of the same ratio). I use Huffman YUV if my capture is critical (ie VHS, then process before recompression) You really need a P4 for the DV codec but you may get away with a fast P3 if you're not compressing the audio on the fly too.