[automerger] m4v_h263: add a test for invalid/negative value am: 7802c68aeb am: 08aa2367b5 am: 644ad716f0 am: c9528234a1 am: ee98fbf584 am: e82c14f41d am: 3c1c45dd71
am: 4e314d9197

Change-Id: Ia2c81329d30376878e5e2438e3bc941a5b1b5b0b