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English (en)

WebM (.webm) is a video file format developed by Wikipedia icon Google. WebM was originally designed to be used on webpages to save bandwidth, but it also has some benefits when it comes to video games and many other applications.

The biggest benefit of WebM over Bink (or AVI) for games is that of file size; a WebM video will be significantly smaller than that of a similar-quality Bink file. For example, the installation size of Hunt Down the Freeman Hunt Down the Freeman decreased by 5.7 GB when switching its FMV cutscenes from Bink to WebM[1]. Furthermore, WebM is much more common and easier to make than the Bink file format, as Bink requires a tool that only takes AVI, then only to find out there's audio or video sync issues that may sometimes happen.

WebM is supported in the following games, engines, and engine branches:

Video codecs Audio codecs
Implementation VP8 VP9 AV1 Vorbis Opus
Source 2 Source 2 (Counter-Strike 2 tested) Yes Yes No Yes** Yes**
GoldSrc GoldSrc
(since 25th anniversary update; intro video only)
Yes Yes No Yes* No
Counter-Strike: Global Offensive Counter-Strike: Global Offensive
(since 2018 Panorama update)
Yes Yes No Yes*** No
Team Fortress 2 Team Fortress 2 (since April 18, 2024/64-bit update) Yes Yes No Yes No
Strata Source Strata Source Yes Yes No Yes No
WebM Video Services for Source 2013
(used by Hunt Down the Freeman Hunt Down the Freeman)
Yes Yes No Yes Yes
*Audio is read, but muted. 🖿<moddir>/sound/ui/valve_sound.wav is used instead.
**Audio is read, but muted. (only in Counter-Strike 2) If the video was unable to play due to incompatible codecs or other codecs issue, then part of the intro sounds (🖿sounds/ui/logo_startup.vsnd_c, which is played separately) will not play or likely be played in lower volume.
***Sometimes audio plays in slower speed and lower pitch.


1. Hunt Down The Freeman - July blog: where we're at + looking for team members! - Steam News
Bink video is replaced with webm (like CSGO and Source 2) and has successfully freed up 5.7GB of space

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