Cannot play mp4 file because of abnormal nal length

Problem: some mp4 file has abnormal nal size and cannot
be played.

Solution: ignore when nal size is abnormal

Bug: 122749422
Test: Play a file which has abnormal nal size and check
if it can ignore abnormal ones and play normally after
abnormal frames

Change-Id: Ic0a53d20ea7e395ab610b8d4895dd3c64ab68106