Vid2mp4 is a project mainly written in SHELL and PYTHON, it's free.
Shell and Python scripts that convert common video formats to MP4 using FFmpeg
====== Usage ======
vid2mp4:
$ vid2mp4.sh
vid2mp4_seek:
$ vid2mp4_seek.h
vid2mp4_timed:
$ vid2mp4_timed.sh
star_time, duration: is seconds, or in the "hh.mm.ss[.xxx]" syntax
vid2mp4_sized:
$ vid2mp4_sized.sh
batch_conversion.py:
$ python batch_conversion.py