Learn How to Slow Down Time-Lapse Videos on iPhone to Make Detailed and Captivating Slow-Motion Effects in Your Time-Lapse Captures

There are moments that need highlighting and there are moments that need a flashing speed. You can control both moments if you are just wondering can slow down a time lapse. There are video editing softwares like Filmora if you want to know how to slow down time lapse on iPhone. Let’s discuss some of the best time lapse editing tools and also learn about how to slow down a time lapse

What Is Time-Lapse?

Time-lapse is a cinematography and photography technique that captures a series of images or frames at specific intervals over a prolonged period of time and then plays them back at a much faster rate. This creates a visually captivating effect where time appears to be moving faster than in real life.

In a time-lapse video, moments typically occur slowly or over an extended period, such as the movement of clouds, the growth of plants, or construction of buildings are compressed into a short video clip. Time-lapse is a powerful storytelling tool and if you are tempted to learn how to slow down a time lapse video because sometimes they can be faster than we intend them to be. Let’s discuss how you can slow down time lapse video.

Method 1: Using Filmora To Change Time Lapse Speed

Filmora is one of the best video editing software whose user-friendly interface allows both beginners and professionals to create compelling videos effortlessly. With Filmora, you can cut, trim, slow down time lapse video, and edit videos. You can also apply built-in effects and transitions, and adjust the playback speed to create stunning time-lapse or slow-motion effects.

Filmora also offers advanced color grading tools so that you can correct and enhance the color in your videos to make them visually appealing. Additionally, Filmora supports a wide range of video formats and allows easy exporting of edited videos to various platforms, making the sharing process convenient and straightforward. With its rich library of royalty-free music and sound effects. Let’s discuss how to change time lapse speed on iPhone.

AI Time-Lapse For Win 7 or later(64-bit)

AI Time-Lapse For macOS 10.14 or later

Open Filmora and start a new project.
Import your time-lapse video by either clicking on “Import” or dragging and dropping the file into the media library.
Drag the imported video from the media library to the timeline at the bottom of the screen.
Click on the video in the timeline to select it. You should see editing options appear.
Look for a speed option, often represented as a speedometer icon. Click on it to open the speed settings.
In the speed settings, you can slow down time lapse video. You can make it slower according to your preference.
After adjusting the speed, play the video in the preview window to see if it’s at the desired speed.
Once done with performing time lapse slower, save and export your edited time-lapse video by choosing the “Export” option.
Choose the desired output format and save location, then click “Export” to save the edited video.

Method 2: Using Imovie To Change Time Lapse Speed

Open iMovie on your iOS device.
Import the time-lapse video you want to edit.
Drag and drop the video onto the timeline.
Select the video clip on the timeline.
Look for the speed adjustment settings; it is usually represented by a turtle or hare icon.
Click on the speed adjustment icon, and a slider or option to change the speed will appear.
Adjust the speed according to your preference by dragging the slider or entering a value.
Play the video to preview the new speed.
Once you are done with the slow down time lapse video, you can save or export the edited video.

Summary

Learning how to slow down time lapse videos on iPhone enhances the storytelling power of your cinematography, allowing viewers to engage more deeply with your content. There are video editing tools like Filmora and iMovie which have revolutionized the editing process, making it feasible to slow down time lapse video directly on your iPhone. These tools are user-friendly

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AI Time-Lapse For Win 7 or later(64-bit)

AI Time-Lapse For macOS 10.14 or later

Open Filmora and start a new project.

Import your time-lapse video by either clicking on “Import” or dragging and dropping the file into the media library.
Drag the imported video from the media library to the timeline at the bottom of the screen.
Click on the video in the timeline to select it. You should see editing options appear.
Look for a speed option, often represented as a speedometer icon. Click on it to open the speed settings.
In the speed settings, you can slow down time lapse video. You can make it slower according to your preference.
After adjusting the speed, play the video in the preview window to see if it’s at the desired speed.
Once done with performing time lapse slower, save and export your edited time-lapse video by choosing the “Export” option.
Choose the desired output format and save location, then click “Export” to save the edited video.

Method 2: Using Imovie To Change Time Lapse Speed

Open iMovie on your iOS device.
Import the time-lapse video you want to edit.
Drag and drop the video onto the timeline.
Select the video clip on the timeline.
Look for the speed adjustment settings; it is usually represented by a turtle or hare icon.
Click on the speed adjustment icon, and a slider or option to change the speed will appear.
Adjust the speed according to your preference by dragging the slider or entering a value.
Play the video to preview the new speed.
Once you are done with the slow down time lapse video, you can save or export the edited video.

Summary

TRANSLATE with x

English

Arabic	Hebrew	Polish
Bulgarian	Hindi	Portuguese
Catalan	Hmong Daw	Romanian
Chinese Simplified	Hungarian	Russian
Chinese Traditional	Indonesian	Slovak
Czech	Italian	Slovenian
Danish	Japanese	Spanish
Dutch	Klingon	Swedish
English	Korean	Thai
Estonian	Latvian	Turkish
Finnish	Lithuanian	Ukrainian
French	Malay	Urdu
German	Maltese	Vietnamese
Greek	Norwegian	Welsh
Haitian Creole	Persian

TRANSLATE with

COPY THE URL BELOW

Back

EMBED THE SNIPPET BELOW IN YOUR SITE

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11 Apps To Speed Up A Video On iPhone

As a content creator or a video editor, you may deal with many different aspects of editing. It may go from basic editing to VFX and so on. Speed ramping is also an important feature of editing. Creators who make cinematics or B-rolls often may have used this feature.

Changing the speed of the whole video doesn’t look good in most situations therefore speed ramping feature was created. Speed Ramping means gradually changing the speed of a clip over time. It isn’t a complex thing but doing it correctly in the right amount at the right time can change the feel of the whole video. It catches the attention of viewers through different scenes of a clip.

So, here we have mentioned some iPhone video editing softwares that can at least do basic speed changes. but most of them can also do advanced speed ramping. These are as follows:

Filmora Go:

It is available on IOS and Android both.

Want to do speed ramping? use Filmora Go. But are you a content creator and want to do more than just video editing? I would still recommend “Filmora Go”. Because it is such a versatile and easy-to-use software made by Wondershare. Like its PC software, it is also packed with many cool features such as chroma key, mask, keyframing, blending, e.t.c. It also supports multiple layers. It has built-in effects, transitions, and presets to speed up the editing process.

It is a paid video editor but you can try it for free, free trial includes most of the features but it leaves a watermark on export.

~Features:

Has speed curves for smooth speed ramping.
Supports multiple images and video layers.
Have many presets and filters for fast pace editing.
Have cool features like chroma key, masking, keyframing, e.t.c.
Supports “Pixabay’s” stock library.

~Cons:

Its UI doesn’t support editing in landscape orientation.
It doesn’t support 4k video resolution.

~Steps:

Import: Open Filmora Go, Click “New project” to start a new project, or Choose the previous one from the “Draft” portion. Select videos or images to import to your timeline. Hold and drag the clip to change its arrangement.

Edit: You can add text, effects, stickers, layers, e.t.c. by clicking their icon, present on the bar at the bottom.

Click and Drag a clip from the corner to trim it.

Click the “PiP” icon to add image or video layers, you also can add multiple layers.

Select a clip to edit it. Different editing tools appear on the bottom bar. Here you can change its opacity, its speed, or add animations.

Click the diamond icon above the timeline to add keyframes. Zoom, move, or rotate the clip to add keyframes with the passage of time.

Speed Ramping: To Change the speed of a clip, select it then click the “Speed” icon on the bottom bar of the screen. Move the slider to change the speed of the whole clip. To do speed ramping, click the “curves” option to choose a preset or create your own. Click a preset to apply it, and click again to open its edit menu. drag the beats up and down to change speed or add or delete a beat if you want.

Effects: Click the “Effects” icon to open the effects menu. Select an effect to apply to your clip.

Click the white box between two clips to add transitions.

Export: Click the “Export” button to export your file. Select your desired resolution and frame rate to export your clip.

Some Free Video speeding Softwares for iPhone:

If you are short on budget or don’t want to spend much on video editing softwares then you can try these free softwares. They are free that doesn’t mean that they are useless, they are quite good for beginners or moderate users although some of them are designed for professionals also. If you don’t believe me, go and try it yourself. Apart from just changing the speed, they are good in other editing aspects also.

Adobe Premiere Rush:

It is available on IOS and Android both.

If you are looking for free but good speed ramping software then why go anywhere also when you have an amazing video editor made by a well-known software company “Adobe”. Like premiere pro, they have designed a compact version for phones named “Premiere Rush”.

It is a free video editor that has all the tools needed for video editing, from video effects to color grading and audio editing. Its UI is a bit similar to PC video editors. It is a free video editor with no watermarks. Although it takes some time to understand it. But once mastered, you can do editing quickly.

~Features:

It is a free video editor with no watermark.
It supports up to 4K resolution at 60fps.
You can extract audio and can do voiceover directly from the software.
It has hundreds of filters, overlays, and title designs.
It has basic color grading tools.
It also has a motion tracking feature. (in Paid version)
It supports multiple audio, video, and text layers.

~Cons:

It only runs on high-end devices. ( It is not supported in most mid-range phones)
Not suitable for beginners. Its UI is quite hard to understand.
Doesn’t have common features like the chroma key, masking, e.t.c.

~Price:

Its Premium version is available for 9.99/month. It includes some premium features. Or you can purchase the “All Apps Bundle” at $54.99/month for the annual plan.

~Steps:

Import: Open “Adobe Premiere Rush”, Click the “+” sign at the bottom to create a new project. in the media location, select the clips, then click the blue “create” button to start editing.

Click the blue “+” button at the bottom-left corner to add clips, audio, or graphics.

Hold and drag the clips upward to add them as a layer.

Edit: Scroll over a clip to select it. Clicking again shows a pop-up above the selected clip. Here you get 4 options: split, duplicate, separate audio, and delete.

A number of edit options appear on the bottom line of the screen:

Graphics: Click the “Graphics” button to add animated titles, transition graphics, and overlays as a layer. Select to customize its design.

Effects: Click the “Effects” button to add transitions or motion effect. Select a clip to apply transition at both ends. or select a corner of the clip to apply on it only. And change the duration of transition if you want.

Color: Here you can color grade your clips, Apply a preset or color grade manually by using sliders. You can also create your presets.

Transform: Here you can resize, rotate, crop, or change the position of the clip.

Audio: Here you can edit the audio, select a clip to edit its audio.

Speed Ramping: Click the “Speed” button to edit its speed. Select the range option to speed ramp a specific part of the clip. Select the ramp option to create a smooth speed curve. Or Set the clip duration to change its speed accordingly.

Export: To Export your clip, click the “Export” icon on top of the screen. Click “Quality Settings” to adjust export settings then click “Export” to save your file.

CapCut:

It is available on IOS and Android both.

If you are looking for a free but good speed ramping software to help you create slo-mo videos easily anywhere, anytime you want, then “CapCut” can be the right choice for you. It is a free mobile video editing software with many interesting features like keyframing, chroma-key, masking e.t.c. It also supports video and image layers. It has one of the best speed ramping features among other mobile video editors. It provides curves to smoothly speed ramp your clips. It can edit landscape, portrait, and even square video formats. It has many amazing effects and filters, it also has some stock clips.

~Features:

It is completely free and has no watermarks.
It supports up to 4K video resolution.
Has curves for speed ramping.
Has keyframes for animation.
It has hundreds of effects, overlays, and titles.

~Cons:

Its UI doesn’t support editing in landscape orientation.
Lacks some common editing tools.

~Steps:

Import: Open Capcut, then click “New Project” to start a new project. Select files then click “Add” to import them. Click the white box with the “+” sign to add more clips. Hold and drag to rearrange the clips.

Click the “Add overlay” button to add photos or videos as layers.

Edit: On the bottom of the screen, you can find a bunch of tools for editing. From here you can add overlays, effects, filters, titles e.t.c to the timeline.

Select a clip to open the edit menu situated at the bottom of the screen. Here you can do the following tasks:

Split the clip; Change its speed, remove background, edit audio, do color correction, apply filters, stabilize the clip, e.t.c.

We have more edit features for the layers only which include: Spice (Blending), Animation, Masking, Chroma key, freeze frame, change opacity e.t.c.

Click the “Keyframe” icon (Diamond shaped) below the playback screen to apply keyframes to the layer. Pinch and zoom or rotate to transform the clip. Use the “Graphs” button in the edit menu to customize the keyframe animation.

Effects: Click the “+” sign between the two clips to add a transition between them, and drag the slider to change its duration.

Select the effects, filters, or titles icon to add them as a layer.

Export: Click the “Export” button on the top-right side of the screen to export your clip. Or click the button, left to the “Export” button to change its resolution and frame rate.

iMovie:

It is available on IOS and Mac.

If you are an Apple fan and own everything Apple then what’s better than getting your hands on a video editor designed by Apple. It is simple and easy to use. It has all the basic editing tools to enhance your video like crop, trim, transitions, effects, e.t.c. It also has a speed ramping feature which let you change the speed at different points of a clip. It’s AI mode “Magic Movie” lets you select clips and a style and software will make the final product for you.

Its “Storyboards” mode is a creative way of learning production and post-production skills. It lets you choose a theme from many famous Genres available, then it will guide you through the production process like capturing footage, arranging your shots, and creating cinematic titles to enhance your story.

~Features:

It is free and easy to use.
Let you do speed ramping by changing the speed of different parts of the clip .
Supports Raw files.
It’s AI mode creates videos for you on its own.
The “Storyboarding” feature helps you through the production process.

~Cons:

It only works on IOS and Mac.
Not suitable for professional projects.

~Steps:

Import: Open “iMovie” then click “Start New Project” and select one of the 3 following modes to start editing:

Magic Movie: Select the clips for editing, then click “Create Magic Movie” to let iMovie create a movie for you, which you can customize according to your liking.
Storyboard: Click “Storyboard” then select Template and a genre or a style then click “Create” to start the project. iMovie will guide you and let you add the clip or title according to the pattern.
Movie: In “Movie” mode, select the clips from the media browser then click “Create Movie” to start editing.

Edit: Select a clip to edit it. A bunch of tools will appear at the bottom of the screen.

Click the “scissors” icon to split, duplicate, delete the clip, or to detach the audio.

Click the “volume” icon to change the volume of the clip.

Click the “Title” icon to add a title design. Click the text (on the playback window) to edit it.

Click the “Filters” icon to apply it to the selected clip and move the slider to change its intensity.

Speed Ramping: Click the “Speed” icon to change its speed. Move the yellow slider to change the speed of the whole clip. Or click the “Add” button to add partitions (in yellow color) to the selected clip. Select a partition to change its speed only. And click the “Freeze” button to add a freeze-frame.

Effects: Select the black box between two clips to add a transition. Select a transition to apply it and change its time duration if you want.

Export: Click the “Done” button on the top-left corner of the screen to save the clip, then click the “Export” icon on the bottom of the screen to save your file.

Some Paid Video speeding Softwares for iPhone:

If you do most of your video editing from your phone and want to invest some money in it then you should check the softwares mentioned below. They are quite affordable and are worthy of investment. As they are packed with many cool features. But if you aren’t sure which software to use then don’t worry as most of these softwares have a free version to try on but they have some limited features and they provide a watermark on export. But it is a great option to get your hands on new software and once you are comfortable with it, you can purchase its premium version.

Kinemaster:

It is available on IOS and Android both.

If you want to do more than just trimming and cropping to your videos then you should try Kinemaster. For editors, who want to do some advanced-level video editing on their phone, then you must have Kinemaster on your phone. It is a paid software, which is packed with many useful features. It has many video and audio effects. It also has an amazing audio editor. It also has many title designs and basic color correction tools. It has hundreds of effects and transitions + more can be downloaded from its asset store. Its UI is suitable for beginners and content creators both. It is a paid software, but all its features are completely free to use, but the free version leaves a watermark on export.

~Features:

It supports up to 4K resolution at 60fps. (depending on mobile configuration)
Have amazing features like chroma key, keyframing, blend e.t.c
Has built-in audio and video recorder.
Supports multiple texts and video layers with different resolutions depending on the capability of the mobile phone.
Has UI like a PC video editor and supports landscape orientation for editing.
Have an asset store with 100s of free effects, transitions, and stock material.

~Cons:

Can’t export 4K videos on most devices.
Can’t apply keyframes and chroma key to the main video. (can be done on layers only)

~Price:

Its Premium version is available for $4.9/month or $39.9/year. It also includes all the premium assets.

~Steps:

Import: Open Kinemaster, then click “New Project” to start a new project. Select the desired aspect ratio then click “Create” to start editing. Or click the “import” button on top to import an existing file to continue editing.

Media Browser will be opened. Select the clips to add them to the timeline. Click the “X” button on the top-right corner to close the media browser.

Edit: Drag the clip from the corner to trim it. Select a clip to open its editing menu. Here you can change its speed, add filters, do color correction, edit its audio, e.t.c.

On the right side, you will see a bunch of icons. Click the “Layer” button to add a media file, text, or effect as a layer. Click the “Audio” button to add an audio file. Or click the “Rec” button to do a voice-over.

Click the “+” symbol between two clips to add a transition between them, then adjust its time duration if you want.

Speed Ramping: Select the “Speed” option to change its speed. Here you can only do linear speed change. To create a speed ramp effect, split the clip into different parts and then change their speed according to your liking. Apply a crossfade transition of about 0.1 sec to smooth the jump cut between clips.

Effects: Select a clip then click “Clip Graphics” to apply the effect to your clip. Your clip will be highlighted with a yellow box, adjust it to set the time duration of the effect.

Click the “Shop” icon to visit the Asset store. Here you can find many cool Effects, clip graphics, transitions, and sound effects. Download them to use in your project.

Click the Layer clip to edit it. Here you can do chroma key, keyframing, or apply animation.

Export: Click the “Export” icon on the top-right corner of the app to open the export screen. Select the desired resolution and frame rate then click “Save as video” to export it.

Power Director:

It is available on IOS and Android both.

It is a paid but quite advanced video editor available for androids and IOS both. Like its PC version mobile version is also packed with many great features. It is compact and easy to use. It supports multiple video and audio layers. Have many cool filters and transitions. Can also do basic color corrections. To complete post-production work it also has audio editing tools and effects. It also has hundreds of title designs. Its UI is easy to use and supports both portrait and landscape orientation for editing. Most of its features can be used for free with a watermark on export. To remove the watermark you need to purchase the premium version.

~Features:

It supports up to 4K resolution at 60fps. (compatible on most devices)
Supports both Portrait and Landscape orientation for editing.
Supports Key framing and video stabilization also.
Supports multiple audio and video layers.
Can edit videos in different aspect ratios.
Have a vast stock library.

~Cons:

Can’t export 4K videos on many devices.
Can apply keyframing and chroma key to layers only.
Software lags sometimes.

~Price:

Its Premium version is available for $4.9/month or $29.9/year.

~Steps:

Import: Open “Power Director”. Click “New Project” then select Aspect Ratio to start editing. Select clips from the media library Then click the “blue tick” button to add them to the timeline. Click the “+” icon to import more clips. From the bottom bar (in portrait mode), Select the video, image, audio, or effect icon to add them as a layer. In Landscape Mode bar it is situated on the left side of the screen.

Edit: Select and drag the clip from the corner to trim it. Select a clip to open edit tools. From here you can do audio editing, color correction, cropping, stabilization, and speed change.

Here you get more features to edit a layer or an overlay such as chroma key, masking, transform keyframe, e.t.c. To do keyframing, select a layer, then click the “diamond” icon located on the right side above the timeline to add keyframes then rotate, zoom or change the position of the clip with time to add more keyframes. You can also do keyframing for other features like adjustment, mask, blend, and opacity.

Speed Ramping: To Change speed, select a clip or a layer click the “speed” button then move the slider to change its speed. To do speed ramping split the clip into small parts and change their speed respectively. Click the “ease-in” and “ease-out” buttons to smooth the jump between the clips.

Effects: Click the grey box between the clips to add a transition and move the slider to change its duration if you want.

Select a clip, then choose a filter or an effect to apply to the selected clip.

Export: To Export the finished product, click the “export” icon on the top-right side of the screen then click “Produce and Share” to select the video resolution or click the “Settings” icon to change the storage path and frame rate. Then click “Produce”.

LumaFusion:

It is available on IOS and Mac (with an m1 processor).

As a content creator, have you ever wished for creating your own cinematic masterpiece, but the thing holding you back is that you don’t have a powerful workstation or expensive software then don’t worry. You can do professional-level editing on your iPhone with the software named “LumaFusion. It is one of the most powerful and advanced video editors available for your iPhone or iPad.

It is a multi-track video editor with many useful features like the Chroma key, keyframing, color grading, and color LUTs. Have powerful color grading tools and an audio editor. It also has a lock and load stabilizer. You have to purchase the software before using it. It doesn’t have any free version to try.

Credits: Pic by Luma touch website.

~Features:

It supports up to 4K video resolution at a max of 240 fps.
Can also edit and export 360 videos.
Have powerful color correction tools. You can also import your own color LUTs.
Supports Keyframing on almost all the editing tools within the software.
You can add some third-party audio plugins.
Supports up to 6 audio and video layers.
Have “Storyblock” stock library. (Many of its contents are free to use)
Supports external monitor for display.

Credits: Pic by Luma touch website.

~Cons:

Not available for Android devices.
Being an advanced software, it doesn’t have masking and speed ramping features.
Doesn’t have a free version to try on.

~Price:

It is available for purchase at $29.99.

~Steps:

Import: Click the “+” button on the bottom of the screen to start a new project. A small tab will appear, change the settings if you want, then click the “+” button on the top-right side of the tab to start your project.

Click the “flower icon” on the top-right side of the screen to open the source menu (Its icon changes depending on the present tab), Click “Photos” to open folders and files. Click and drag files to add them to the timeline. Click and drag the clips on the top of the primary clip to add them as a layer.

Edit: Click and drag the clips from the corner to trim them. On the bar at the bottom of the screen, you will find basic tools. Click the clip, to open editing tools on the same bar.

Click the “+” icon on the bottom bar or select “Titles” on the source menu to open the Titles menu. Drag and drop the titles to use them. Double-click the text to open the edit menu.

Double-click the clip to open the edit menu. Here you can transform the clip, change its speed, Stabilize your clips, do color grading, add an effect and perform audio editing.

Speed Ramping: In the edit mode, click the “speed and reverse” button and move the slider back or forth to change the speed of the whole video. To do speed ramping, split the video into parts and apply different speeds to create a speed ramp effect. This method is not perfect but it gets the job done.

Effects: Select the “Transitions” icon on the source menu to open the transition menu. Drag and drop a transition on a clip to use it.

Double click a clip to open the edit menu. Then in the “Color & Effects” tab select any effects and apply them to your clip.

To do keyframing, on the edit menu, click the “circle” icon on the bottom-right side below the display to start keyframing. then change the settings with time to add further keyframes.

Export: To Export your file, click the “Export” icon on the bottom-right corner of the screen to open the export menu then click the “movie” icon to select the file destination. Select the desired export settings then click the “Export” icon on the top of the menu to export your finished product.

Which One Should I Choose Free or Paid iPhone Video speeding Softwares?

It usually depends on your needs. If you just want a speed editor to make slow-mo or timelapse videos for your social media then you should go for free video editors, as they are easy to use and provide better speed ramping features than some paid video editors mentioned here.

But as a content creator if you want more features alongside speed ramping then you should go for paid softwares mentioned above. As mobile video editors are quite affordable and some of them have features like that of some PC softwares.

FAQs about Speed ramping feature and softwares:

Q) What is Speed Ramping and where it is used?

Speed Ramping is different from just changing the speed of the whole clip. It means changing the speed of the video gradually, so the clip doesn’t feel jumpy.

It is done to give viewers a smooth experience between different parts of the clip. like the fast-forward clip is used to show the passage of time. and the slow-mo is used to emphasize something or produce tension, while a mix of both is used in ads and action scenes, e.t.c.

Q) How to do Speed Ramping?

Speed Ramping methods vary from software to software. Either you can do it by adding keyframes and changing speed with time or you can add or adjust curves for speed change. If your software doesn’t support the speed ramping feature, you can split a clip into parts and apply speed change to them differently. For some of the best iPhone softwares, we have mentioned the speed ramping steps above.

Q) What FPS is best for Slo-mo videos?

Shooting at 60 Fps is ideal as it gives a smooth and crisp video and you can make slow motion easily if required, you can slow it down up to 40% of its speed while maintaining the quality. It is supported in almost most devices nowadays. And if you want to create super slo-mo for your cinematics or product video then 120 or 240 fps is preferable. But higher fps often have disadvantages as it is harder to apply visual effects or masks. So choose the frame rate according to your requirements.

Q) Does changing the speed of video affect its audio?

Yes, changing the speed of video affects the audio, It affects its pitch (tempo). Increasing its speed increases the pitch of the audio making it sound shrill while decreasing the speed of the video or making slow-mo decreases the pitch making it sound deep.

Although, some softwares provide the feature to maintain the pitch while changing the speed of the clip.

~Cons:

Its UI doesn’t support editing in landscape orientation.
It doesn’t support 4k video resolution.

~Steps:

Edit: You can add text, effects, stickers, layers, e.t.c. by clicking their icon, present on the bar at the bottom.

Click and Drag a clip from the corner to trim it.

Click the “PiP” icon to add image or video layers, you also can add multiple layers.

Select a clip to edit it. Different editing tools appear on the bottom bar. Here you can change its opacity, its speed, or add animations.

Click the diamond icon above the timeline to add keyframes. Zoom, move, or rotate the clip to add keyframes with the passage of time.

Effects: Click the “Effects” icon to open the effects menu. Select an effect to apply to your clip.

Click the white box between two clips to add transitions.

Export: Click the “Export” button to export your file. Select your desired resolution and frame rate to export your clip.

Some Free Video speeding Softwares for iPhone:

Adobe Premiere Rush:

It is available on IOS and Android both.

~Features:

It is a free video editor with no watermark.
It supports up to 4K resolution at 60fps.
You can extract audio and can do voiceover directly from the software.
It has hundreds of filters, overlays, and title designs.
It has basic color grading tools.
It also has a motion tracking feature. (in Paid version)
It supports multiple audio, video, and text layers.

~Cons:

It only runs on high-end devices. ( It is not supported in most mid-range phones)
Not suitable for beginners. Its UI is quite hard to understand.
Doesn’t have common features like the chroma key, masking, e.t.c.

~Price:

Its Premium version is available for 9.99/month. It includes some premium features. Or you can purchase the “All Apps Bundle” at $54.99/month for the annual plan.

~Steps:

Click the blue “+” button at the bottom-left corner to add clips, audio, or graphics.

Hold and drag the clips upward to add them as a layer.

Edit: Scroll over a clip to select it. Clicking again shows a pop-up above the selected clip. Here you get 4 options: split, duplicate, separate audio, and delete.

A number of edit options appear on the bottom line of the screen:

Graphics: Click the “Graphics” button to add animated titles, transition graphics, and overlays as a layer. Select to customize its design.

Color: Here you can color grade your clips, Apply a preset or color grade manually by using sliders. You can also create your presets.

Transform: Here you can resize, rotate, crop, or change the position of the clip.

Audio: Here you can edit the audio, select a clip to edit its audio.

Export: To Export your clip, click the “Export” icon on top of the screen. Click “Quality Settings” to adjust export settings then click “Export” to save your file.

CapCut:

It is available on IOS and Android both.

~Features:

It is completely free and has no watermarks.
It supports up to 4K video resolution.
Has curves for speed ramping.
Has keyframes for animation.
It has hundreds of effects, overlays, and titles.

~Cons:

Its UI doesn’t support editing in landscape orientation.
Lacks some common editing tools.