Speed and mute

Remove the audio

The output can be written without its audio track, from the editor or headlessly.

In the editor, the toolbar has a speaker button. Tapping it toggles the audio, and the exported file follows the final state. To always remove the audio, pass removeAudio. The editor then opens muted, and the output has no audio even if the user unmutes:

showEditor(videoUri, { removeAudio: true });

Headless, pass removeAudio to trim(), compress() or merge():

const result = await trim(videoUri, {
  startTime: 0,
  endTime: 10_000,
  removeAudio: true,
});

Change the speed

The output speed can range from 0.25x to 4x.

In the editor, the toolbar shows the current speed (for example "1x"). Tapping it opens a native menu (UIMenu on iOS 14 and later, an action sheet on older iOS, PopupMenu on Android) with 0.25x, 0.5x, 1x, 1.5x, 2x, 3x and 4x. The preview plays at the chosen speed and the export uses it. To start at a different speed:

showEditor(videoUri, { speed: 2.0 });

Headless, pass speed to trim():

const slowMotion = await trim(videoUri, {
  startTime: 0,
  endTime: 30_000,
  speed: 0.5,
});

Any speed other than 1.0 forces a re-encode, regardless of enablePreciseTrimming, because changing the tempo needs FFmpeg filters (setpts for video, an atempo chain for audio). Expect long clips to take longer to process.

Hiding the toolbar

Both buttons are in the edit toolbar. Set enableEditTools: false to hide the whole toolbar; the removeAudio and speed options you pass still apply.