You can use different options for 3gp for example,you may want a different resolution than qcif (176x144), but I found these settings initially worked for me with my compiled version of ffmpeg. It also preserves the original name of the file in the newly converted file: It is however important to fill in the options correctly. In addition, the following script, which I have modified (credit to the original creator), can again be further altered and used to convert mp4 to 3gp or mp4 to mp3 (to extract the audio), or anything whatsoever. This was the only way I could encode to proprietary formats such as mp4 and mp3. I uninstalled any of the ffmpeg packages currently on the system that I had tried to use, and used this excellent Ubuntu compilation guide. In order to get round this problem, the only option may be to build from source.
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