The term "AV4" is not a mainstream codec like H.264 or H.265 (HEVC). Instead, it refers to a conceptual fourth wave of video compression algorithms that prioritized data retention.

Resolution (1080p, 4K) is only half the story. A 1080p video with a high bitrate will often look significantly better than a "compressed" 4K video. "Extra quality" tags usually signify that the video was encoded with a High Profile

:

Most commonly, this refers to a specific website (av4.us) known for hosting various adult videos. In this context, "extra quality" might refer to high-definition (HD) versions of specific clips.

is its . This feature is critical for "extra quality" in professional video workflows for the following reasons:

As AV1 continues to evolve, we can expect to see: