Trying to demux a canon .mov file into either .wav or .ac3

[Onceler2]

I have a Canon that shoots video and audio in AVC and 1536Kbps PCM stereo
I am trying to get Audacity to demux the audio (but it is refusing it) and then rejoin the audio using tsmuxer so that I can import it into TMPGEnc 4.0 xpress because I need to resize the video before I send it to where it is going.
what should I be using?
I have a AVC Baseline@L5.0 1920x1080p video stream which I need to resize to 720x480
and then there is the audio which is in PCM which is what I need to convert
Thanks

[Baldrick]

Have you tried any demuxers like "ffmpeg -i video.mov -acodec copy audio.wav" or a gui like Pazera Free Audio Extractor.

[smrpix]

Not sure why you feel you need to demux. TMPGenc 4.0 Express should have no problem at all handling LPCM audio. It's the video that may give you trouble in that older version.