I add the ability to embed 3g2 videos into the view page so that they perform the same as other formats. Before the user just got a "No thumbnail" link that took them to a "Download movie" link. There is one change in the Gallery Mime settings that has to be done manually at the moment and two files that need patched.
1. Under Site Admin - MIME Types - add video/3gpp2 with extension 3g2, 3gp
2. Run FfmpegToolkitHelperClass.patch and then re-install the ffmpeg module
3. Run GalleryMovieItemClass.patch
This makes any 3g2 movies added after the patch show up with thumbnail and play in Quicktime. 3g2 movies already uploaded do not change though.