BIK/en

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Valve "Open Your Mind" intro (2007 - 2011), which was created using Bink.
vgui_movie_display on elevator screens in Portal 2 Portal 2, which uses Bink video.

BIK files are the video files created using Bink, as part of Epic Video Tools, originally RAD Video Tools.

The startup videos that play on all Valve and third-party games (since the Source 2007 Source 2007 update) are .bik videos. They are also used in the menu backgrounds in Left 4 Dead, Left 4 Dead 2, Alien Swarm, Portal 2 and the elevator screens in Portal 2. Prior to Bink being added to Source, previous games or older versions of those games used AVI files instead. Vampire The Masquerade - Bloodlines, which runs on beta version of Source 2004, was the first Source game to utilize Bink video for it's startup video.

By today's standards, Bink (retroactively Bink version 1.0), are known for having large file sizes while having lower quality, lower framerate, and is much more complicated when it comes to converting files, such as AVI or MP4 (with deprecated the QuickTime application prior to RAD Video Tools update in late 2010s) to BIK, which ends up causing audio/video de-sync or other issues. Due to these and many other issues, Bink 2 was created, which has massive improvements over Bink 1. Furthermore, there are alternatives to Bink video, such as WebM, which is open-source.

Some Mac ports of Source engine games may instead use QuickTime's MOV video file.
The Titanfall engine branch has been upgraded to use Bink 2, which uses the .bk2 file format instead, and has more features, such as supporting multi-core rendering, HDR output, a full-color range, and better video quality than Bink 1.
In post-panorama versions of the CS:GO engine branch, newer versions of Hunt Down the Freeman and Team Fortress 2, all Source 2 Source 2 games, as well as Strata Source, it is replaced by WebM.

In The Stanley Parable it is replaced by IVF to avoid paying for Bink.

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