Merge "better manage buffer for libstagefright_soft_mpeg4enc" into klp-dev am: 021575025c am: 5944b611e5 am: 1a419c7b2a am: 70a63bdf27
am: 40833da7b9

Change-Id: Icae7e002d54f1029a8b79a640fa2a9b89faf7a0d