Distorted sound after converting to mpg

[Colin Law]

On 1 March 2012 20:39, Colin Law <clanlaw at googlemail.com> wrote:
> On 1 March 2012 17:36, Colin Law <clanlaw at googlemail.com> wrote:
>> On 1 March 2012 17:18, bat guano <batguano999 at hotmail.com> wrote:
>>> ...
>>> 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.
>> ...
>> I will report back after trying on the other machine.
>
> I have tried it on another PC with a different version of ffmpeg and
> it is fine, so it is a problem with my ffmpeg.  I think a bit of
> re-installing is in order for a start.

For the record this appears to be an issue with the version of
ffmpeg/avconv currently provided with Ubuntu 12.04 alpha.  A
workaround is to use
ffmpeg -i file.mp4 -target pal-dvd -acodec ac3_fixed out.mpg
It is the acodec that is significant, forcing it to use ac3_fixed
rather than just ac3

I have submitted a bug
https://bugs.launchpad.net/ubuntu/+source/libav/+bug/945482

Colin