can i play mp3 & mpeg format song or video in ubuntu 9.04 version without use of any third party software?

Yes totem the inbuilt player can play it , provided you do the below :

Install libdvdcss2 and w32 video codecs in Ubuntu 9.04 (Jaunty)

Support for WMV, RealMedia and other formats has been bundled into the w32codecs package. This package is not available from the Ubuntu repositories due to licensing and legal restrictions.To play encrypted DVDs, the libdvdcss2 package is essential.

For Ubuntu 9.04 (Jaunty) Users use the following procedures

sudo wget http://www.medibuntu.org/sources.list.d/jaunty.list --output-document=/etc/apt/sources.list.d/medibuntu.list

Then, add the GPG Key using the following commands

sudo apt-get update

sudo apt-get install medibuntu-keyring

sudo apt-get update

For i386 Users install Codecs using the following command

    sudo apt-get install w32codecs libdvdcss2

For amd64 Users install Codecs using the following command

    sudo apt-get install w64codecs libdvdcss2

no you can't,you must enable third party software so you can have them work.it's very simple:
first make a copy of your sources.list cp /etc/apt/sources.list /etc/apt/sources.list.bak
then open sources.list sudo gedit /etc/apt/sources.list
uncomment the lines which look like :
                                                                     deb http://archive.canonical.com/ubuntu jaunty partner
                                                                     deb-src http://archive.canonical.com/ubuntu jaunty partner
(just erase the # infront of them,if they have it)

add the following at the end of the file:

## Medibuntu - Ubuntu 8.10 "jaunty jackalope"
## Please report any bug on https://bugs.launchpad.net/medibuntu/
deb http://packages.medibuntu.org/ jaunty free non-free
deb-src http://packages.medibuntu.org/ jaunty free non-free

save and close the file.
run this:
sudo apt-get update
and then run this (it's the gpg key) :
wget --quiet http://packages.medibuntu.org/medibuntu-key.gpg -O - | sudo apt-key add -

now you have third-party software.for playing mp3,mpeg and so on...just install restricted-extras...
sudo apt-get install ubuntu-restricted-extras
you're done.

easy way
sudo apt-get install libk3b2-mp3
that will allow you to play mp3's

yes inbuilt totem player can play it very easily.
On Mon, Apr 27, 2009 at 3:39 PM, birender <
<email address hidden>> wrote:

> New question #68906 on Ubuntu:
> https://answers.launchpad.net/ubuntu/+question/68906
>
> can i play mp3 & mpeg format song or video in ubuntu 9.04 version without
> use of any third party software?
>
> --
> You received this question notification because you are an answer
> contact for Ubuntu.
>