Want to add slow-motion effect to a portion of a video file? Don’t want to buy an expensive program to just add slow-motion effect to video files on your Windows 10 PC? In this guide, we will cover how to add slow-motion effect to video files in Windows 10 without installing additional software.
Use Photos app to add slow-motion effect to videos
The Photos app in Windows 10 is quite powerful. In addition to viewing picture files, you can use it enhance picture files, import pictures from external devices like phone, and more.
With Windows 10 Fall Creators Update, the Photos app has gained the ability to add slow-motion effect to video files. This means that you can now add slow-motion effect to your video files without having to install third-party programs from the web.
The best thing about Photos app slow-motion effect feature is that you can preview the slow-motion effect before saving the video file. Also, when you save it, the Photos app creates a new copy video file without making any changes to the original video file.
Add slow-motion effect to video in Windows 10
In this guide, we will see how to add slow-motion effect to video files in Windows 10 using Photos app.
Step 1: Navigate to the folder containing the video file for which you want to add the slow-motion effect. Right-click on the video file, click Open with, select Photos to open the video file with Photos app.
Step 2: Once the video file is opened with the Photos app, click on anywhere outside the video (click on the black area) to see options. Click Edit & Create and then click Add slo-mo option.
NOTE: If you cannot find Add slo-mo under Edit & Create option, please click on the three dots (…) to see the option. If you cannot find the option anywhere, it’s likely because you are not running Windows 10 Fall Creators Update (1709) or above version. Please update to the latest version to get the slo-mo feature.
Step 3: Now, select the speed of the slow-motion effect by moving the slider. Select the portion of the video file where you would like to apply the slow-motion effect using the blue colored sliders.
Step 4: Finally, click Save a copy option to create a new video file with the slow-motion effect. As said earlier in this guide, the Photos app doesn’t make any changes to the original video file.
The new video file will be saved in the same location where the original video file is located. So, you won’t see the slow-motion effect if you open the original video file.
You can now open the video file in your favorite video player to see the slow-motion effect in action.
The now discontinued Windows Live Movie Maker also supports adding slow-motion effects to video files.
Dave Coller says
I had this problem, then discovered why. I was trying to open the saved copy too soon.
I had used a ‘Reflecta cine digitiser’ to digitised a ‘Standard 8’ cine film, saved as an MP4 file.
The film speed was twice what it should be.
This Cine film was originally taken at 16 frames per second (fps) on ‘Standard 8 mm’ film.
A single film is 50 feet long, 80 frames per foot, and at 16 fps is about 4 mins long
The digitised version plays back in 2 mins 3 secs (4000/123) = 32 fps
To view, or save a copy at the correct speed Open film in ‘Photo’ – (free with Windows 10).
This your [1st screen]
Select Edit & Create
Select ‘Slomo’, then at the top of the page set it set to the halfway point – this does a 2:1 speed reduction.
At base move the Micky Mouse ears to full left and full right this sets the ‘Slomo’ to cover the whole film.
Then save a copy. Wait while blue line at the top gets to the right, then WAIT (important) until [1st screen] reappears
The copy is now saved at 16 fps. Playback time 4 mins 6 secs (for the 50 feet).
Check to make sure the copy plays before renaming it
Hope this works for you.
brian santor says
i am getting the same error.
Connie says
When I load an MP4 file to Photos to add the slow-mo effect, it tells me that “something has gone wrong” and won’t allow me to proceed. it’s a standard MP4-nothing odd about it – but I continuously get this message. The videos are typically less than 20 seconds long, often 6 to 10 seconds before augmentation.
Any thoughts, suggestions? I would very much like to add slow motion options to some of my shorts. Thank you.