MPEG4Source: fix fragmented read. am: 6b401a3376 am: 96114e7c5d am: bbc5c8fc60 am: 067ab2f74e am: 218692ec4f am: fa7be9da95 am: b31373e62c am: 2df7cd6571 am: 64e7c6089f am: 739585fb8d
am: a3df50b011

Change-Id: I014932315c3b489fc23b9fe50949cbfc8f680c83