Does anybody know what the audio bitrate of the Sony Handycam HDR-CX150 is? I know it's Dolby Digital(ac-3) 2.0 stereo, 16bit audio, 48Khz sampling, buut what is the audio bitrate? Is it 192Kbps, 256Kbps, 440Kbps, 640Kbps? What is it?! I need to know the bitrate so I don't loose any quality or waste any disc space on my dvds.