ReadonlyframeReadonlypaintThe producer's count of the paints it has made, which is what its own diagnostics name a paint by. Two paints of one frame carry different numbers, so this is the only key that joins a frame the renderer drew to the paint the producer recorded making.
ReadonlymediaThe producer's seconds for frameId. The producer also states the position
in milliseconds, and this deliberately does not carry it: that value is the
seconds scaled by a thousand, so dividing it back is not the identity, and
on a container whose tick grain is not whole milliseconds, an NTSC
30000/1001 track among them, the result names no frame at all.
ReadonlyframeOptional ReadonlyrotationClockwise display-matrix turn still owed by the decoded pixels. Canvas frames that a producer already oriented report 0. Omitted remains upright for producers written before this field existed.
Optional ReadonlyacknowledgePresent when the producer distinguishes frame delivery from display.
One frame a push-based media producer has decided is on screen, carrying the frame it is and the media time it stands for. Whoever receives it owns it and must close it.