Shorty News

Optical-Flow Slow Motion, iPhone Spatial Audio and More

Today’s update is about the moments between frames. Shorty can now create the frames your camera didn’t capture, so any shot can slow down without stuttering. iPhone videos recorded with Spatial Audio upload like any other clip, edits keep your footage’s own frame rate, and the director you pick now watches your clips itself.

Optical-Flow Slow Motion

Slow motion used to depend on how your footage was shot. A 30 fps clip has exactly 30 pictures a second. Play it at quarter speed and each picture has to stay on screen four times, so the motion stutters.

Shorty now fills those gaps with optical flow. It follows how everything in the shot moves from one frame to the next and draws the frames in between. Ask for slow motion in your brief, and the director can take a shot down to a quarter of its speed or slower, then ramp back to real time on the beat.

A 15 fps test clip played at 60 fps. Three of every four frames you see were created by Shorty.
The same aerial shot at 0.25× speed. Left: slowed without new frames. Right: slowed with optical flow.

Smooth, and True to Your Footage

New frames are only half the job. Shorty keeps every original frame exactly in its place, so cuts never drift off the beat. At a hard cut, the last picture holds instead of melting into the next shot. And if a clip already carries repeated frames from an earlier frame-rate conversion, Shorty removes them first, so they don’t stretch into longer freezes.

Every slowed shot is checked against your original frames before it goes into your edit.

The same 15 fps clip converted to 60 fps by CapCut (left) and Shorty (right). Our test, October 15, 2026.

iPhone Videos with Spatial Audio

iPhones that record Spatial Audio save two soundtracks in each video: the spatial track and a standard mix that plays everywhere. Some of these videos were being turned away on upload as damaged. They never were.

Shorty now accepts them from your device, from Google Drive and from AI assistants connected over MCP, and edits with the standard mix. If one of your iPhone videos was rejected recently, try it again.

Your Footage’s Frame Rate

Edits used to render at 30 fps, whatever you shot. Footage filmed at 24 fps picked up a repeated frame every fifth frame: a small judder, but one you feel in a cinematic shot.

Now each edit renders at the rate your footage was made for. 24 fps footage stays at 24, 25 at 25 and 30 at 30. Footage shot faster, at 50, 60 or 120 fps, keeps its extra frames for real slow motion, and optical flow covers the rest.

Directors That Watch Your Footage

When you pick a specific model to direct your edit, it now watches your clips itself. It looks at frames, listens to the audio and reads the transcript whenever it needs to, instead of working from a written summary of each clip. This works for edits of up to ten clips. Auto keeps its fast analysis pass.

Also new: Gemini 4 Argon, Google’s strongest creative direction in Shorty, at a higher cost.

Music That Lands on the Beat

Building an edit from a reference video? If the reference is cut to music and you haven’t attached or asked for another track, Shorty can now score your edit with the reference’s own soundtrack. Please only use references whose music you have the rights to.

The director can also see the beat now. Every soundtrack arrives with its tempo, beats and sections, and for montages Shorty checks that the cuts land on the beat before your edit is delivered.

Sharper Revisions

Change the shape

Ask for “make it horizontal” and every shot is reframed for the new canvas, instead of the old video shrinking into a band.

Length that follows your words

Cut ten seconds and the video gets ten seconds shorter, instead of other shots stretching to fill the gap. Add a scene and the rest isn’t squeezed to make room. Shorty checks each revision against your request before it renders.

Go back a version

Revisions can now see the versions before the current one, so “bring back the old intro” works.

No text means no text

Write “no text” or “no captions” in your brief or a revision, in any of 17 languages, and Shorty keeps on-screen words out of your edit.

Good to know

How do I get slow motion in Shorty?

Ask for it in your brief, for example “slow the drone shot to quarter speed” or “ramp into slow motion on the jump.” The director decides which shots need new frames and creates them with optical flow.

How slow can a shot go?

Optical flow can multiply a clip’s frames up to 20 times, so a 30 fps shot can slow to 0.05× in a 30 fps edit. An edit can include up to four optical-flow shots, each made from up to 8 seconds of footage.

Does slow motion cost extra?

Optical flow is charged in credits as part of the edit, based on how many new frames are created. Longer and slower shots use more.

Which iPhone videos with Spatial Audio work?

Videos that include a standard audio mix next to the spatial track, which is how iPhone saves them, upload and edit normally. A file with only a spatial track can’t be edited yet, and Shorty says so when you upload it.

Upload a clip, ask for slow motion, and see what was hiding between your frames.


The Shorty Team

Slow it down. Keep it smooth.

Upload your footage and ask for slow motion in your brief. Shorty creates the frames in between.

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