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I am wondering what can be preventing the Quicktime player from playing the audio track alongside a video.

The files I have are MPEG-4. When launched on macOS QuickTime, there is no sound. I tested quickly on an iPhone, and the audio is played when the same files are launched. On the same machine, the Elmedia Player also successfully produces the audio.

How can I troubleshoot why QuickTime is not being able to play the audio track?

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  • after starting Quicktime, go to system preferences and click on the Sound preference and see what's selected. Also, is the volume indicated on the QT window.
    – Natsfan
    Dec 6, 2019 at 1:53
  • What version of macOS, and secondly, which version of QuickTime Player - v.7 or v10.x?
    – IconDaemon
    Dec 6, 2019 at 2:20
  • Is this all files, or just a particular group of files?
    – benwiggy
    Dec 6, 2019 at 8:21
  • @benwiggy a particular group of files. MOV files play with sound.
    – MadPhysicist
    Dec 6, 2019 at 14:02
  • @MadPhysicist Check what codec the audio uses in the file. Get Info, maybe.
    – benwiggy
    Dec 6, 2019 at 16:05

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