Helix Player is an open source project which makes digital thumbnailing of video on your Symbian mobile phone easy.
Apart from 3GP and .h263, the software supports MP3, RealAudio (G2) and AMR audio. The playing functions are pretty basic with a simple audio gain control and as yet, rewinding files is not yet implemented in the version offered here.
The Helix Player has an intuitive design and the user friendly media manager is a pleasure to use. Best of all, its totally free.