MeGUI is the most comprehensive GUI based ISO MPEG-4 solution. It suports MPEG-4 ASP (XviD & libavcodec MPEG-4) using mencoder, MPEG-4 AVC (x264) using x264.exe or mencoder, (HE)AAC audio using BeSweet & Nero AAC encoder and MP4 muxing using mp4box. In addition, it also supports the open source wavelet based Snow codec.

Changelog:
changed: dgindex demuxing now only demuxes the chosen audio tracks (unless you select demux all) - this may require an update of dgindex so check the requirements above
changed: the way dgindex is being run has been simplified, this could potentially help people who've been having problems with the indexing function (I know of two people to have reported this). If it doesn't work, please download debugview from sysinternals, and run it while running megui and post the logged output here.

Program Information Category: Multimedia Type: Free Version: 0.2.2.5 Size: 181KB Works on: Windows Product page: here