Need a way to get .wav out of Axis P8221 or ONSSI Ocularis

[cristcomm 0]

I have a setup with a covert camera and discreet microphone, inputs and alarms and I'm running an Axis P8221 and ONSSI. Everything works well its just an issue now of giving the customer a .wav file of the audio. I could convert video to .avi and then strip the audio but it takes forever to export video to .avi. What I would like is a separate piece of hardware or software that would take the audio and covert to .wav. I assume the P8221 will dual stream to the ONSSI as wall as an audio program but at the least I could use the analog outputs. Any experience with this out there?