crossfading

Crossfading is a transition technique in audio and video where two sources overlap in time: as one source fades out, another fades in, creating a smooth blend rather than a hard cut. In audio, crossfading helps maintain energy and continuity during transitions between tracks, sections of a mix, or looping segments. In video, the term is closely related to a cross-dissolve, where the first clip gradually becomes transparent while the second becomes visible, producing a seamless visual transition.

In audio production, crossfading can be performed with a hardware crossfader on DJ mixers or with software automation in digital audio workstations. Common crossfade shapes include linear and equal-power curves; equal-power crossfades are designed to keep perceived loudness more constant around the transition, reducing audible dips or spikes. Properly timed crossfades consider tempo, dynamics, and spectral content to avoid phase issues or abrupt changes in energy.

In video editing, crossfades or dissolves serve to indicate a passage of time, a change in location, or a mood shift. They are often used in music videos, documentaries, and film montages. The duration of a crossfade in video is a stylistic choice, typically ranging from a brief moment to several seconds, depending on pacing and narrative intent.

History and usage notes indicate that crossfading has roots in analog sound mixing and film editing, where overlaps and dissolves offered smoother transitions before the widespread use of cuts. Today, crossfades remain a versatile tool for maintaining sonic and visual continuity across media.