Distorted sound after converting to mpg

[bat guano]

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> >>  I am attempting to convert to mpg using ffmpeg, using
> >>> the command line
> >>> ffmpeg -i program.mp4 -target pal-dvd program.mpg
> >>> Unfortunately the audio produced is hiss, slightly modified by the
> >>> underlying audio track. The video is fine.
> >>>
> >> Is the audio of 'program.mpg' OK when you play it on your computer with VLC (or similar) player?
> >
> > Yes it is fine,  it is just the conversion that goes wrong.

Is the audio of 'program.mpg' OK when you play it on your computer with VLC (or similar) player...
AFTER conversion?