This tool uses a local WebAssembly build of FFmpeg to repeat the source streams. For compatible MP4, MOV, WebM, MKV, and AVI files, stream copy keeps the original picture and audio data instead of compressing every frame again.
The export is one finite video, not an infinite-play setting. Its duration and approximate size grow with the selected count, which makes it useful where a player or platform cannot repeat a short source clip by itself.