generate
Generate a thumbnail sequence for the given video fill or design block. Note: Only one request per block runs at a time. A second request for the same block waits for the first to finish instead of failing. Note: For a video fill, cancelling has no effect once the first frame has been scheduled — the engine still produces the remaining frames. Cancelling the collecting coroutine stops your collector from seeing them. Design block sequences cancel at any time. Note: Collect on the main thread; collection throws otherwise.
Return
a flow of VideoThumbnailResult object which emits for every generated frame thumbnail. It emits exactly numberOfFrames times.
Parameters
the video fill or a design block.
the height of a thumbnail. The width will be calculated from the video aspect ratio.
the time in seconds relative to the time offset of the design block at which the thumbnail sequence should start.
the time in seconds relative to the time offset of the design block at which the thumbnail sequence should end.
the number of frames to generate.