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

Change-Id: Id2e171b09b990d60e3950925911bc7c939fb2f29