Merge "MPEG4Extractor: cast media time to int64_t in order to avoid check on unsigned integer overflow."
am: ee38fad5e9

* commit 'ee38fad5e9109f92b24c0e4d6d0d021b3d20e4e0':
  MPEG4Extractor: cast media time to int64_t in order to avoid check on unsigned integer overflow.