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How to Remove Portions of Your Video (Cuts/Trims)

Need to remove parts of your video? Read below to find out how.

There will be times when you need to remove parts of your video. Maybe in the video you made at home, it took you an extra few seconds to launch PowerPoint after you started your screen recording. Maybe you ended your class early on campus and your podcast video has extraneous footage of you chatting with students at the front of the classroom.

Kaltura's Video Editor allows you to trim your video.

What Kinds of Cuts Can You Make to a Video in Kaltura?

The Kaltura Video Editor allows you to cut out any piece of your media. If you choose, you can have the remaining clips fade in and/or out. The Video Editor provides access to other functionality, which you can read about in our documentation on adding hotspots to your videos as well as our documentation on the in-video quiz feature.

How to Make Cuts


In order to make cuts to your video, you first have to launch Kaltura's video editor.
  1. Within Canvas, click on "My Media" in the left navigation.
  2. Identify the video you'd like to edit and click the pencil icon located to the right of it.
  3. Click "Launch Editor" next to the video preview.

A screenshot of the edit player, with the "Launch Editor" button circled.

  1. Make your edits.

An annotated screenshot of the timeline scrubber.There are three main types of cuts that you can make. Feel free to use the links below to jump to the section you're interested in.

You can manage all three of these functions with the little box that appears above the cursor in the timeline after you click it (called the "scrubber"). Note that there are a couple ways to perform each kind of cut, but we'll just address one way in each section below.

Setting a New Start Point

  1. A screenshot of the timeline scrubber.Under the video preview, click on the timeline where you'd like your video to begin. (For more precision, zoom in on the timeline using the "Timeline Zoom" slider on the lower right side of the window.)
  2. On the blue-ish box just above where your cursor is on the timeline, click the icon that looks like a left bracket (" [ "). The timeline before your cursor should become greyed out.

Setting a New End Point

  1. Under the video preview, click on the timeline where you'd like your video to end. (For more precision, zoom in on the timeline using the "Timeline Zoom" slider on the lower right side of the window.)
  2. On the blue-ish box just above where your cursor is on the timeline, click the icon that looks like a right bracket (" ] "). The timeline after your cursor should be replaced with diagonal grey lines.

Removing Parts of Your Video in the Middle

  1. Locate the point in the timeline that's the start point of the clip you want to remove. (For more precision, zoom in on the timeline using the "Timeline Zoom" slider on the lower right side of the window.)
  2. Click the scissors icon ("Split") in the blue box above your cursor on the timeline. This turns your existing video into two separate clips.
  3. Click on the timeline where the end point of the portion of the video you'd like to remove is.
  4. Click the scissors icon ("Split") in the blue box above your cursor on the timeline. Now your video is divided into three clips: the beginning, the part in the middle you want to remove, and the end.
  5. Click anywhere within the clip in the timeline that you want to remove. The selected clip will have a yellow outline around it.
  6. Click the trashcan icon above the timeline. The selected clip should be replaced with diagonal gray lines, indicating it’s been removed.
A screenshot of the timeline with the trashcan icon circled.

Editing Multi-Stream Videos

A screenshot of the controls above the editor timeline, with the "select video" icon circled.If you’re editing a video that has 2 or more video streams (such as a Kaltura Capture video), you can select which video stream you’d like to see in the video preview window. It may be easier, for example, to identify where to cut your video based on your camera feed instead of your screen feed - or vice-versa. Regardless, to change the video feed in the preview window, click the icon above the timeline that looks like a stack of rectangles with a triangular play button on top. You’ll be presented with the available video streams you can select.

Note that you are not able to cut parts of only one stream. If you make any cuts, it will apply to all streams of a Kaltura Capture recording.

After making any edits you'd like to make, you're ready to save your changes.

  1. Click "Save a Copy."

"Save" vs "Save a Copy"

"Save" will overwrite the original video. "Save a Copy" will create a new copy of the video and leave the original alone.

In most circumstances, we recommend that you click "Save a Copy." Though it adds another entry to your "My Media," it feels safer to have the original intact just in case. Be sure to employ a good naming and/or tagging scheme so you can tell which one is the edited version.

For podcasts: if you're asking your students to visit the podcasting site (podcast.ucsd.edu) to view your recordings, any changes you make in the Video Editor will only be reflected on the podcasting site if you click "Save." The podcasting site currently shows only the original copy of the video that was created.

  1. Enter a name for your new clip (if you clicked "save a copy").
  2. Wait for the changes to be saved and click "OK."

How to Add Fade-Ins and Fade-Outs

Within the video editor, you can also apply fade-in and fade-out effects to any selected clip.

A screenshot of a selected clip on the timeline.
  1. Within the editor, click on any of the discrete clips that you've made (or just click the unedited clip in the timeline if you just want to add a fade-in or fade-out to the original unedited video). The selected clip will be outlined with a yellow box and will have yellow tabs (or "curtains") on either side.
A screenshot of the fade in/out icon.
  1. With your clip selected, click the Fade In/Out icon above the timeline, which looks like a diagonal line with balls on either end.
A screenshot of the fade in/out menu.
  1. Within the "Fade In/Out" box that appears, identify in seconds how long you'd like either transition to take. (If you're not sure, just enter 1 second, which is a fairly typical length for a fade in or fade out.) If you don't want one of the transitions (i.e. you only want a fade in or a fade out), just leave the time of the other at 0.
A screenshot of a selected clip with fades applied.
  1. Click anywhere in the window outside of the Fade In/Out box and your transition will be saved. You'll be able to tell it was applied if you see the Fade In/Out icon on the side(s) of your clip.

Notes on Fade-ins and Fade-outs

  • When you play back your video within the editor, the fade ins/outs may not display properly. You'll need to save your changes (again, "save a copy" is safer) and wait for it to process in order to see your changes.
  • Fade-in and fade-outs apply to your video only; they don’t affect the audio.

Frequently Asked Questions

Use the list below to jump to the answer.

Why would I want to use the Video Editor?

Answer: It allows you to remove parts of your video that you don't want students to see.

For example:

  • You can eliminate the beginning of the video when you're setting up your desktop for capture, starting your presentation, or waiting for students to file into the room.
  • You can eliminate the end of the video when you're ending your recording, closing your presentation, or speaking to students.
  • Something happens in the middle of your video that you don't want in the final product, such as an interruption, a flub, or a coughing fit.
  • It allows you to create a new copy of your video. You can do this after making edits, but you can also just duplicate a video by clicking "Save a copy."
  • You can use the editor to "chunk" your video by "saving a copy" of each chunk separately. (You could also then join those video chunks together with a playlist.)

What do I need in order to edit a video?

Answer: A web browser and a video you're allowed to edit.

The Kaltura Video Editor is web-based, so from a technical perspective, all you need is a relatively up-to-date web browser.

You can only edit videos for which you are the owner or a co-editor. To learn more about co-editors and other collaborative roles, see our documentation on sharing Kaltura videos in Canvas.

My edited video seems to be taking a long time to process. How long is it supposed to take?

Answer: Answer: Video processing may take as long as 15 times the duration of the video, but this is unlikely.

When a video is added to Kaltura, a process called "transcoding" begins, where new video data is created. While transcoding times vary based on a variety of factors (such as the amount of movement or color), the biggest factor is the size (in pixels) of the video. As of August 2021, Kaltura provides the following typical transcoding times:

  • For videos that are 640x360 ("360p"), the transcoding time will usually be equal to the video's duration.
  • For videos that are 1280x720 ("720p"), transcoding will usually take between 4 and 8 times the video's duration.
  • For 1920x1080 ("1080p") videos, transcoding will usually take between 10 and 15 times the video's duration.

This means that if you make minor edits to a 2-hour lecture 1080p video and save them, it could take between 20 and 30 hours for that video to be ready for viewing/publishing. This is partly why we always recommend clicking "save a copy" instead of "save" when making edits. That way you can always use the original copy if you need to.

All of that said, we've found that since Kaltura migrated their cloud to Amazon Web Services, transcoding times have increased considerably. In addition, it appears as though transcoding times for videos that have been edited appear to be much longer than transcoding times for new videos added to Kaltura. That said, if your video is exceeding the average transcoding time articulated in the formulae above, email us at kaltura@ucsd.edu.

Rarely, a video gets stuck waiting for a user or moderator to "approve" the edits. While it's unclear at present whether users can fix this themselves on the front end, we can definitely do this for you on the back end, so, again, let us know at kaltura@ucsd.edu if you're encountering some excessively long wait times for edited videos.

What happens to my captions when I make edits to a video?

Answer: They will be trimmed along with your video and the timings should remain accurate. If you "save a copy," the trimmed captions will be present but a new request for machine captions will be submitted.

When you're done editing your video, your existing captions will be cut appropriately. That said, it never hurts to do a spot check around the points of your edits to ensure that everything looks good.

If you clicked "save a copy" (as we recommend), a new copy of the video is created. All new videos in Kaltura generate a request for machine captions, so you should expect an additional caption track to be added to your video. Provided that you have existing captions that are accurate, you can delete this additional track if you wish.

Can I trim just one video stream from a Kaltura Capture recording?

Answer: No.

Unfortunately, cuts performed to a Kaltura Capture recording affect all the video streams. (So you can't, say, cut off the stream of your screen a minute before the end of your video - you'd also have to cut the camera/audio for that minute.)

Can I edit YouTube videos I've added to "My Media?"

Answer: No.

Have additional questions about video? Contact Multimedia Services at kaltura@ucsd.edu.