The video is played at the selected speed and re-encoded in real-time using the Canvas and MediaRecorder APIs. Audio pitch changes naturally with speed.
No. All processing happens locally in your browser.
The video is played back at the chosen speed during recording. A 60-second video at 2x speed takes about 30 seconds to process.
Output is WebM format, which plays in all modern browsers and can be converted with the Video Compressor tool.