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Video 2014: No sound on play, even though its played on preview

Nero Video, part of Nero Platinum 2014.
Make Advanced Movie. HDTV Full HD, 60i. Stereo.
Drag and Drop to the Videos tab a 10 minutes, 1.16 GB m2ts file previously uploaded from my Canon camcorder to the hard disk.
The file thumbnail appear in the Videos tab, along a line describing its properties: Name, Duration etc.
Position the mouse cursor on that line, context menu "preview'.
A Preview window appears.
Click the Preview Window's Play button
The video plays with sound.
Drag the file to Video 1.
The file name appears in both Video 1 and Audio 1.
Click "Play".
The file plays but with no sound.

How can I fix this?

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