[automerger] MPEG4Source: fix fragmented read. am: 5c57e911b4 am: 7445f0e400 am: ab9bfb83b1 am: da2d2587d3 am: ca0bd10918 am: 442d5ba7b6 am: fb86876c62 am: 6810ac8bcd am: 1338d42a52 am: c8effca29b am: db30246808 am: e118a11588

Change-Id: I4ba215315c58c02473c0331cce26cd02b81be09a