Compression for anime is notoriously difficult compared to live-action for several reasons:
In communities like those found on Doom9 or various encoding Discords, this dataset helps establish the "best" settings for public releases. Technical Context
The .7z extension indicates it is compressed using the 7-Zip LZMA algorithm, which is preferred in technical communities for its high compression ratio, making large video datasets easier to share and store.
Developers use these clips to see which encoder settings produce the smallest file size while maintaining "perceptual transparency" (meaning the human eye can't tell the difference from the original).
It is used to test "pre-processing" filters (like de-noising or de-banding) before the final encode happens.
Maintaining the crispness of hand-drawn or digital line art requires high precision; otherwise, "ringing" artifacts (shimmering noise around edges) appear.