Select Every Nth

Keeps every nth frame of an IMAGE batch — halve a video's frame count before an expensive stage, or thin a long sweep down to samples.

Controls

images: The BHWC batch to thin out.
Every nth (nth): Keep one frame in every nth. 2 keeps every other frame, 1 keeps everything (useful with offset alone to drop leading frames).
offset: Frames to skip before the first kept frame. With nth 2, offset 0 keeps frames 1, 3, 5 and offset 1 keeps frames 2, 4, 6 (one-based, as the rest of the pack counts frames).
fps (optional socket): The batch's frame rate, such as Load Video's fps output.

images: The kept frames, in their original order.
fps: The wired rate divided by nth, so the kept frames still span the same time; 0 when no fps is wired.

An offset at or past the end of the batch stops with the batch's size instead of returning an empty batch, which no downstream node could use.