[automerger] MPEG4Source: fix fragmented read. am: 5c57e911b4 am: 7445f0e400 am: ab9bfb83b1 am: da2d2587d3 am: ca0bd10918 am: 442d5ba7b6 am: fb86876c62

Change-Id: I2c156d1e0f52aa28448448eb403478ed7759c512