Reproduction of 3GP "for dummies"

By default, there is no way to view a 3gp file with sound in the Ubuntu Linux distribution.

For example, MPlayer loses the 3gp format, but without sound, giving only a warning: “Cannot find codec for audio format 0x726D6173”.

The problem is in the AMR libraries. Experienced users know that Google search for the keywords “ubuntu + 3gp + sound” will provide links to solutions published on the Ubuntu Forums , the essence of which is to rebuild FFmpeg and MPlayer player with AMR support.
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However, there is a simpler way. There is a debian-multimedia package repository that includes the above programs with AMR support.

Thus, you just need to connect debian-multimedia and make an update.

To access the repository, add the line to the end of the /etc/apt/sources.list text file

deb http://www.debian-multimedia.org stable main

A quick way to do this from the console is to give the command

$ sudo bash -c 'echo deb http://www.debian-multimedia.org stable main >> /etc/apt/sources.list'

Then update the apt tree with the command

$ sudo apt-get update

In case of the “NO_PUBKEY 07DC563D1F41B907” error, you just need to install the debian-multimedia-keyring package:

$ sudo apt-get install debian-multimedia-keyring

By installing the ffmpeg update, you can open 3gp files with the ffplay program:

$ ffplay /path/to/clip.3gp