Distorted sound after converting to mpg

[Colin Law]

On 1 March 2012 17:18, bat guano <batguano999 at hotmail.com> wrote:
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>
>
> ----------------------------------------
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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.

That had not occurred to me, I assumed it was something I was doing.
I have another machine running a different version of ffmpeg, I will
give it a go.
It appears to be the conversion of aac to ac3 that is going wrong, as
if I specify
-acodec mp2 -b:a 128k
then it seems to be ok.

I will report back after trying on the other machine.

Thanks for the help

Colin