The faint yell you've heard in ALL 6 Star Wars films is the legendary scream called 'The Wilhelm Scream'. After playing Grand Theft Auto, Metal Gear Solid 4 and God of War I and II, I can confirm the infamous scream is also in video games.
Below are some of my favorite video games that include 'The Wilhelm Scream':
3. Battlefield 2: Modern Combat
5. Command and Conquer 3: Tiberium Wars (Occasionally when killing infantry)
11. God of War (When you kill the man holding the bridge on the Rooftops of Athens. Also during a later cinematic scene where Kratos leads his troops into a church)