Killzone 3's ridiculously high data size explained:
There are over 32GB of video sequences stored on the Blu-ray disc, with game data accounting for around 9GB, all powered by a 20MB executable. Interestingly, despite having the option of using Sony's own h264-based PAMF video tech for the cinematics, Guerrilla has opted instead to use Bink - an ancient video codec with often questionable image quality that requires large amounts of bandwidth to achieve acceptable quality.
As demonstrated in our Final Fantasy XIII Endgame feature, its quality level simply doesn't compare with more recent video compression technologies, but with the space of Blu-ray available, Guerrilla can simply allocate more bitrate at the videos in order to improve quality. A six-minute cinematic occupies around 1.1GB of space on the Blu-ray disc. At its best, the Bink video is almost a match for the same content running directly from the game engine but in fast action scenes, image quality loses consistency and macroblocking is evident.
The cinematics themselves are based on what appear to be offline renders of the game engine in action, so there is a good sense of continuity between video sequences, engine-driven cut-scenes and gameplay. However, even when allocated comparatively massively amounts of bandwidth, video artifacts are clearly seen during playback of fast-action scenes. Detail also tends to smear into macroblocks on darker areas.
The majority of the cinematics are actually stored on the disc twice. The traditional 2D video encode of each major cut-scene is joined by a stereoscopic 3D counterpart, adding around 16GB of extra bulk to the disc. The 3D versions of the videos get the same bandwidth allowance as the 2D encodes - not a problem as the stereoscopic version uses half-resolution per eye.