stagefright: MP4Extractor: allow 10% overhead on default sample size am: a27317ab45 am: 268c480035 am: 87ce4202df am: d8c0785a36 am: fed97f38c2 am: 44f4c4d388 am: bdba8a6e12 am: de67feb70e
am: 4723392015

Change-Id: Ie38a424efff794ae685046440b7883525eca002a