I dunno...the time from muzzle flash to "impact" is about right for a 2000-ft slant range....

I need to research where the gun is located on the MiG-29.

Edit: I just looked again. You're right; the muzzle "flash" looks decidedly phoney.

Second Edit: The single-barrel 30mm cannon IS in the left wing root, so if they photo-shopped it, they did a little research.