Fixed a MP4-related bug in ODIDMediaEngine.create_resource() preventing duration extraction

The MP4 duration logic currently requires parsing down to the SampleTimeTable
 (7 boxes deep) but the MP4 duration logic in ODIDMediaEngine.create_resource()
 was only loading 5 levels. Fixed.

Verified duration extraction with the file Parthi had issues with
 (B-AVC_MP4_MP_SD-08.MP4 - 180s).