Pick a concept (or mix elements). Each shown on light + dark, with wordmark and at favicon sizes (16/24/40px). Tell me the number + any tweaks.
Two offset play triangles = motion / video frames, with a flat-design depth cue. Reads cleanly even at 16px (front triangle only).
Camera/crop corner brackets frame a play triangle — speaks to both the image editor and video maker. At 16px the brackets drop, leaving a clean play.
An “F” whose stacked arms + small play chevron suggest forward motion and flat layers. Strongest as a recognizable lettermark; scales to a clean monogram at 16px.
A thin ring (lens/aperture/“render in progress”) around a play triangle. Friendly, modern, distinct from generic play-button icons.