在将视频附加到电子邮件或发送给您的朋友之前，您是否需要剪切视频的特定部分？我们将向您展示在 iPhone 和 iPad 上修剪视频的不同方法。
您可以使用 Apple 的内置视频编辑工具或第三方应用程序通过修改开始和停止时间来调整视频的长度。继续以下部分以获取分步说明。
使用照片应用程序修剪视频
照片(Photos)应用程序是在 iPhone 和 iPad 上查看和编辑媒体文件的默认工具。以下是在应用程序中修剪视频的方法：
- 启动照片(Photos)应用程序，滚动到“媒体类型”部分，然后选择要修剪的视频。
- 点击右上角的编辑以启动照片(Edit)编辑(Photos)器。
- 在“视频”选项卡中，时间轴的开头和结尾有两个左右箭头图标。将左向箭头滑动(Slide)或拖动到您喜欢的起点。
向右箭头可让您调整视频的结尾。将滑块拖动到您希望视频停止播放的位置。
当您调整箭头时，时间线框将变为黄色。您还应该看到视频中特定点的实时预览/缩略图和时间戳。
- 您的设备会将视频部分保存在黄色时间线框中。框外的剪辑(Clips)将被切断。点击播放按钮(Play button)预览视频的修剪部分。
如果您对结果感到满意，请点击完成(Done)以将视频保存到您的设备。
- 将视频另存为新剪辑(Save Video as New Clip)将导出剪辑的修剪部分并将其保存为新视频。视频的原始版本或父副本将保持不变。
如果您只想在库中保存视频的修剪版本，请选择保存视频。(Save Video)
在 iPhone 和 iPad 中修剪慢动作视频(Video)
慢动作视频不同于普通视频。他们通常以正常速度开始播放，在中段放慢速度，最后以正常速度淡出。我们将向您展示如何修剪慢动作视频中的剪辑持续时间和慢动作效果。
- 启动照片(Photos)应用程序，滚动到“媒体类型”部分并选择慢动作(Slo-mo)。
- 选择要修剪的慢动作视频，然后点击右上角的编辑(Edit)。
- 要缩短视频长度或持续时间，请将时间线栏两侧的向左或向右箭头拖动到您喜欢的起点和终点。(left or right-facing arrows)
- 下一个时间线栏中的间隔部分突出显示以慢动作模式播放的视频部分。拖动左右垂直线(left and right vertical lines)以修剪慢动作效果的持续时间。
- 点击播放按钮(play button)预览更改，然后点击完成(Done)保存到您的图书馆。
使用 iMovie 剪辑视频
iMovie 是由Apple开发并预装在 iPhone、iPad 和Mac(Macs)上的视频编辑应用程序。这是使用 iMovie 在 iPhone 上修剪视频的方法。
- 打开照片(Photos)应用程序，选择要修剪的视频，然后点击编辑(Edit)。
- 点击右上角的三点菜单图标(three-dot menu icon)，然后在“选项”菜单中选择iMovie 。
- 点击剪刀(Scissor)图标以调出视频修剪器。之后(Afterward)，拖动时间线栏两侧的黄色播放头图标来更改视频播放的开始和结束位置。(yellow playhead)
- 点击播放图标(play icon)预览修剪的剪辑，然后点击完成(Done)。
iMovie 会将视频的修剪部分导出到照片(Photos)编辑器。
- 点击完成(Done)将修剪的视频保存到您的 iPhone 或 iPad 媒体库。
撤消视频修剪
当您在 iPhone 或 iPad 上编辑或修剪视频时，照片(Photos)应用程序不会删除您剪切的剪辑部分。您可以随时返回照片(Photos)编辑器并重新调整视频剪辑的开始和停止时间。
- 打开您修剪的视频，点击右上角的编辑(Edit)，然后将左右箭头拖动到初始位置。
- 您还可以通过选择编辑器右下角的恢复来撤消视频修剪。(Revert)
“还原”选项将撤消对视频剪辑进行的修剪和其他编辑（滤镜、曝光调整、饱和度、亮度等）。如果您只想撤消视频修剪，最好手动重新调整黄色滑块。
注意：(Note:)如果您使用“将视频另存(Save Video)为新剪辑”选项保存了修剪的视频剪辑，则无法撤消修剪或将剪辑恢复到其原始长度。那是因为视频的原始（阅读：未修剪）版本已经在您的库中。
(Trim Videos)使用第三方应用程序(Third-Party Apps)在 iPhone 中修剪视频
照片(Photos)和 iMovie 编辑器是修剪休闲或常规视频的绝佳工具。如果您需要高级功能来专业地编辑视频(edit videos professionally)，您将需要第三方视频编辑器。或者，如果您需要修剪和剪切单个视频的多个部分。查看我们为 iPhone 和 iPad 设计的最佳视频编辑应用程序(best video editing apps for iPhone and iPad)汇编，以获取建议。
其他视频编辑技巧
这里有一些其他方法可以根据您的喜好在 iPhone 或 iPad 上编辑和调整视频。
在 iPhone 上裁剪视频(Crop Videos on iPhone)
想要(Want)更改常规或慢动作视频的大小或尺寸？点击底部菜单中的裁剪图标(crop icon)，然后将轮廓的角拖到要保留的视频部分。
点击右下角的完成以保存视频，或点击顶部菜单中的(Done)重置(Reset)以撤消裁剪并将视频恢复为原始尺寸。
如果您想将视频裁剪为特定的纵横比(crop a video to a specific aspect ratio)，请点击右上角的调整大小(Resize)图标（看起来像迷宫），然后选择任何存在纵横比的素材。
更改视频方向(Change Video Orientation)
点击左上角的旋转图标(Rotate icon)，将视频逆时针旋转 90 度。
根据需要多次点击图标，直到视频处于首选方向。
在 iPhone 和 iPad 中翻转或镜像视频(Flip or Mirror Videos in iPhone and iPad)
此功能会创建视频的水平或镜像反射——右侧的主体出现在左侧，反之亦然。
在“裁剪”部分，点击左上角的三角形图标(triangle-like icon)以翻转视频。再次点击该图标可将视频翻转回其原始状态。
iMovie 编辑器与照片(Photos)应用程序中的视频编辑器一样好。唯一的区别是 iMovie 编辑器没有专用的慢动作编辑器。如果您想修剪应用于慢动作(Slo-Mo)视频的慢动作效果的长度，请在照片(Photos)应用程序中编辑您的视频。如果你有问题就告诉我们。
How to Trim a Video on iPhone or iPad
Do you need to cut out specific portions of a video before attaching it to an еmail or sending it to your friends? We’ll show yoυ different waуs to trim videos on an iPhone and іPad.
You can either use Apple’s built-in video editing tools or third-party apps to adjust the length of your videos by modifying the start and stop time. Proceed to the sections below for step-by-step instructions.
Trim Videos Using the Photos App
The Photos app is the default tool for viewing and editing media files on iPhones and iPads. Here’s how to trim videos in the app:
- Launch the Photos app, scroll to the “Media Types” section, and select the video you want to trim.
- Tap Edit in the top-right corner to launch the Photos editor.
- In the “Video” tab, there are two left and right-facing arrow icons at the beginning and end of the timeline. Slide or drag the left-facing arrow to your preferred starting point.
The right-facing arrow lets you adjust the end of the video. Drag the slider to the point where you want the video to stop playing.
As you adjust the arrows, the timeline box will turn yellow. You should also see a live preview/thumbnail and timestamp of the specific point in the video.
- Your device will save the portion of the video within the yellow timeline box. Clips outside the box will be cut off. Tap the Play button to preview the trimmed portion of the video.
If you’re satisfied with the results, tap Done to save the video to your device.
- Save Video as New Clip will export and save the trimmed portion of the clip as a new video. The original version or parent copy of the video will be left untouched.
Choose Save Video if you want to save only the trimmed version of the video in your library.
Trim a Slo-Mo Video in iPhone and iPad
Slo-mo videos are different from regular videos. They typically start playing at regular speed, slow down in the midsection, and fade out in the end at regular speed. We’ll show you how to trim the clip duration and slow-motion effect in slo-mo videos.
- Launch the Photos app, scroll to the “Media Types” section and select Slo-mo.
- Select the slo-mo video you want to trim and tap Edit in the top-right corner.
- To shorten the video length or duration, drag the left or right-facing arrows on both sides of the timeline bar to your preferred start and stop points.
- The spaced-out section in the next timeline bar highlights the portion of the video that plays in slow-motion mode. Drag the left and right vertical lines to trim the duration of the slow-motion effect.
- Tap the play button to preview the changes and tap Done to save to your library.
Trim Videos Using iMovie
iMovie is a video editing app developed by Apple and pre-installed on iPhones, iPads, and Macs. Here’s how to trim a video on an iPhone using iMovie.
- Open the Photos app, select the video you want to trim, and tap Edit.
- Tap the three-dot menu icon in the top-right corner and select iMovie in the “Options” menu.
- Tap the Scissor icon to bring up the video trimmer. Afterward, drag the yellow playhead icons on both sides of the timeline bar to change the start and end position of the video playback.
- Tap the play icon to preview the trimmed clip and tap Done.
iMovie will export the trimmed section of the video to the Photos editor.
- Tap Done to save the trimmed video to your iPhone or iPad media library.
Undo a Video Trim
When you edit or trim a video on your iPhone or iPad, the Photos app doesn’t delete the portion of the clip you cut off. You can always return to the Photos editor and readjust the start and stop times of the video clip.
- Open the video you trimmed, tap Edit in the top-right corner, and drag the left and right-facing arrows to their initial positions.
- You can also undo the video trim by selecting Revert in the bottom-right corner of the editor.
The “Revert” option will undo the trim and other edits (filters, exposure adjustments, saturation, brightness, etc.) made to the video clip. It’s best to manually readjust the yellow sliders if you only want to undo the video trim.
Note: If you saved a trimmed video clip using the “Save Video as New Clip” option, you cannot undo the trim or restore the clip to its original length. That’s because the original (read: untrimmed) version of the video is already in your library.
Trim Videos in iPhone Using Third-Party Apps
The Photos and iMovie editor are great tools for trimming casual or regular videos. You’ll need a third-party video editor If you need advanced features to edit videos professionally. Or, if you need to trim and cut out multiple portions of a single video. Check out our compilation of the best video editing apps for iPhone and iPad for recommendations.
Other Video Editing Tips
Here are some other ways to edit and adjust videos on your iPhone or iPad to your preference.
Crop Videos on iPhone
Want to change the size or dimensions of a regular or slo-mo video? Tap the crop icon in the bottom menu and drag the corners of the outline to the video section you want to keep.
Tap Done in the bottom-right corner to save the video, or tap Reset in the top menu to undo the crop and revert the video to its original dimension.
If you want to crop a video to a specific aspect ratio, tap the Resize icon (looks like a maze) in the top-right corner and select any footage present aspect ratios.
Change Video Orientation
Tap the Rotate icon in the top-left corner to rotate the video 90-degrees in an anti-clockwise direction.
Tap the icon as many times as you want until the video is in the preferred orientation.
Flip or Mirror Videos in iPhone and iPad
This feature creates a horizontal or mirror reflection of the video—subjects on the right appear on the left and vice-versa.
In the “Crop” section, tap the triangle-like icon in the top-left corner to flip the video. Tap the icon again to flip the video back to its original state.
The iMovie editor is just as good as the video editor in the Photos app. The only difference is that the iMovie editor doesn’t have a dedicated slo-mo editor. Edit your video(s) in the Photos app if you want to trim the length of the slow-motion effect applied to Slo-Mo videos. Let us know if you have any questions.
