Hola Jose,
if you are using Ubuntu and you have sound in other applications, then this might be a codec problem. Please open Synaptic (or whatever package manager you use) and check if the packages "non-free-codecs", "ubuntu-restricted-extras" and "libquicktime1" are installed.
alvaro
> Message: 2
> Date: Sun, 14 Jun 2009 16:28:20 -0400
> From: Jose Luis Santorcuato <santorcuato76@gmail.com>
> Subject: [PD] sound and video
> To: PD List <pd-list@iem.at>
> Message-ID:
> <4345df630906141328y1e184d16i469fb7f851aadce@mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
> Dear friends.... i can run videos, fx, and others, but not the sound of the
> videos... how connect the audio for videos....mov ....mp4....??? Can you
> send me the draw or patch?
> I use OSX and Ubuntu
> Greetings from Chile
> Jos?