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On a Mac, I've been using QuickTime to record .m4a audio files from Hangouts conversations via iShowU Audio Capture.

If I open the file in Adobe Audition CC 2017 on Windows 10, it plays correctly: the 2 ends of the conversation are in separate channels (left and right) and are at appropriate volume levels.

But if I open the file using a different player (such as VLC Media Player 2.2.4 on Win 10 or "VLC for Mobile" on iOS) the channels get mixed together, and the volume of the voice from the other end of the VOIP call is too quiet.

I really want to be able to play these files:

  • in 3 locations: Mac, iPhone, and PC
  • at variable speed (0.5x-2.0x) but at normal pitch

What are my options? Are there players available for each platform that can play the m4a files with appropriate channel volume and play at variable speed? Or is there something I'm doing wrong in VLC or QuickTime?

P.S. Audacity 2.1.0 on Win 10 says "[File] is an Advanced Audio Coding file. Audacity cannot open this type of file." I'm confused about why Audacity wouldn't be able to open such a standard audio file type.

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