As posted by Luis Wu at halo.bungie.org:
The Halo 4 cutscenes, unlike the pre-rendered Halo Anniversary cutscenes, appear in-game in surround sound – and that’s how we’re making them available to you. (Thanks, as always, to Cody Miller for his stellar recording services.) If you don’t have a surround sound rig, these degrade nicely to normal stereo.
We’re releasing these in batches, in a variety of HD and SD downloadable versions, plus a streaming Flash version.
HD versions are 1280×720, SD versions are 640×360.
You can view a streaming version of the cutscene by clicking on a thumbnail.
Visit HBO’s Halo 4 Cutscene Library now >>