Use By clip duration when every piece should be no longer than a set time, such as 30 or 60 seconds. Use Into equal parts when you need the complete recording divided evenly. The plan shows each start, end, and running time before processing begins.
The browser downloads a WebAssembly video engine only when you start splitting. Each output is re-encoded as H.264 MP4 for precise requested boundaries and broad playback support, then offered separately and together in one ZIP file.