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Precisely adjust video playback speed with support for 0.1x to 4x processing.
Drop or click to upload your video
MP4, MOV, AVI, MKV, WEBM, FLV, WMV, 3GP
Max 20 MB • Max 1 files
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When you need to slow down a video to study details or fast-forward to skip redundant content, traditional video players often fail to provide precise speed control. This tool uses frame sampling interpolation and audio phase vocoder technology to achieve precise speed adjustments ranging from 0.1x to 4x, maintaining audio-video synchronization without stuttering. Video speed adjustment is a technique that changes the playback rate by adjusting the timeline and audio sampling rate without altering the video resolution.
Q: Will changing the video speed affect the image quality?
No, the original video resolution and H.264 encoding are maintained by default.
Q: How do you achieve 0.5x slow motion without changing the audio pitch?
We use phase vocoder technology to resample the audio spectrum, avoiding the pitch distortion caused by traditional slowdown methods.
For extremely low speeds (<0.3x) or extremely high speeds (>3.5x), we recommend enabling the high-quality resampling option. DRM-protected videos cannot be processed. The maximum file size per upload is 500MB.
For sports training videos, a 1.5x to 2x speed increase is recommended to observe movement continuity. For language learning, a 0.7x to 0.9x slowdown is ideal for enhancing listening comprehension. Typical processing example: A 1-minute video at 25fps accelerated by 2x will have a duration of 30 seconds, with the audio frequency automatically compensated to a normal hearing range.
