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.

(It is super surprising to me to learn that an audio file wouldn't behave identically everywhere.)

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

Is QuickTime recording correctly, and VLC is at fault for interpreting the data improperly?

Or is there some other Mac software I could use that would record audio channels in a way that preserves the separation of channels (and the appropriate volume levels) even when played in VLC on Mac, iPhone, and PC?

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