Distorted sound after converting to mpg

[bat guano]

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> >> >>>
> >> >> 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?
>
> Sorry, I misread your question. The hiss is there when I play
> program.mpg it on the computer with vlc or mplayer.
>
Seems (to me) like there's something wrong with your version of FFmpeg.