Movie Files from Analog Camcorder Tape Play with NO...

I connected everything per instructions, but when I record from analog tapes by connecting a camcorder to my iMac, there IS picture, but NO Audio.

One thing that may be useful to know is that my camcorder is pretty old (Hitachi VM-E310A), and only has two outlets (YELLOW and WHITE; but no RED), so I connected only the yellow and white wires of the RCA cable to the camcorder, and the same to the video adapter that goes into the EyeTV 250.

Please will someone advise how I can solve this problem?

Thanks very much. I look forward to your reply.