No audio

In February I purchased Nero Burning ROM 2015, and then Nero 2015 Platinum a few hours later (when Burn didn't do what I wanted it to), to burn .f4v files to DVD. I have just been made aware that the DVDs do not have any audio.

I have also tried using Nero to convert the .f4v files to .avi or .mp4, and the converted files have no audio either. I have tried the DVDs in different players, and using different software to play them and the converted files (WMP and VLC).
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