온라인 에서 비디오 속도 를 변경 - 속도 를 가속화 하거나 느리게 한다

Yes. MiOffice uses FFmpeg's atempo filter to adjust audio speed without the chipmunk effect. Voices sound natural at any speed.

0.25x (extreme slow-mo), 0.5x (half speed), 0.75x, 1.5x, 2x (double), 3x, and 4x. Covers everything from slow motion to time-lapse.

1.5x or 2x works great for speeding up boring setup steps. Viewers can still follow along clearly at 2x.

Yes. Use 0.25x or 0.5x to slow down action shots, sports clips, or any moment worth savoring.

MP4, WebM, MOV, AVI, and MKV input. Output is always MP4 (H.264).

Up to 500MB. No daily limits, no signup, no watermarks.

No. By default, FFmpeg runs via WebAssembly in your browser. On some devices, processing may use our secure server.

Yes. A 4-minute video at 4x becomes 1 minute. Great for time-lapses of cooking, building, or drawing.

It stretches existing frames. For true high-FPS slow motion, you need a camera that records at 60fps+. This tool works with what your video has.

Yes. Works on any modern phone browser. Speed changes are processed entirely on your device.