Fixed some meta data issues in the recorded mp4 file

- Mainly correcting the location of stbl box which should be a child of minf box.
  This resolved the issue where the mis-muxed encoded file could not be played by QT/VLC.

- Enabled the the recorded tracks by setting the flags to 0x07 by default

- Allows for encoding either 32-bit or 64-bit offsets. By default encoding
  32-bit offsets to reduce the metadata overhead

- Fixed a edts box issue where an empty elst box was used at the end

Change-Id: I570621a26714a81dc9400271aa5d3a07b483172f