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Before the dominance of streaming services like Netflix and Disney+, movie collectors relied on digital downloads, often via BitTorrent or Usenet. Storage space was expensive, and internet bandwidth was limited. You couldn't simply download a 50GB raw Blu-ray rip. You needed a file that balanced manageable size (usually fitting onto a single DVD-R or a small hard drive partition) with visual fidelity.
This is where the x264 library shined. It is a free software library for encoding video streams into the H.264/MPEG-4 AVC format. Encoding a complex film like Aeon Flux using x264 is an art form. The codec uses advanced algorithms to predict motion and reduce redundancy in frames. In a fast-paced action sequence—such as Aeon’s infiltration of the Breen stronghold or the "Monican" spy sequences—the encoder must decide how to allocate bits. Aeon.Flux.2005.x264.DTS-WAF
A standard stereo mix (2.0 channels) flattens this experience. A DTS track, however, provides 5.1 channels of discrete audio. This means the viewer can hear the subtle sound of a surveillance drone buzzing from the rear speakers, or the echo of a footstep in a hallway coming from the sides. Before the dominance of streaming services like Netflix