The easiest way to create a vertical clip for Reels and Shorts is to take an existing horizontal video and crop it in the center. The result is almost always recognizable from the first frame β and not in a good way. Telematic approaches this differently: the teaser is not a crop, but a separate piece inspired by the main script.
Why Cropping Doesn't Work
Horizontal composition is built for a wide frame: text and objects are placed across the entire width, and important details may end up at the edges. When mechanically cropping to vertical, part of the frame is lost β subtitles shift, and key objects fall outside the visible area. This can be fixed on a case-by-case basis, but it doesn't eliminate the main problem: the pace and editing of the vertical clip must differ from the horizontal one because the viewing context is different.
How the Teaser is Assembled
The teaser is built according to the script of the main, already edited horizontal clip β that is, it uses the same storyline, facts, and structure, but is storyboarded anew for the vertical format and short duration. The system waits for the full video script to be ready and only then starts generating the teaser β this guarantees that the trailer will not diverge from the content of the main clip.
Without a Call to Action
The teaser has a separate logic in terms of meaning: it is not sales-oriented but rather promotional. It consciously lacks a CTA funnel for a target action β only an invitation to watch the full video. This is a deliberate decision: the short vertical format operates under the rules of the recommendation feed, where an aggressive call to action reduces watch time and works against the clip itself.
Linking Formats
After publication, both videos β the full one and the teaser β are linked together: each has an orientation tag and a link to its pair. On YouTube, this is implemented in the correct order β the long video is released first, and only then the short one that references it, not the other way around.
Versioning During Re-Generation
If the script or editing of the main video changes and you reassemble the clip, the teaser has its own file version β the previous version is not silently overwritten, and you can revert to the desired version if the new generation turns out worse.
When to Use Both Formats
If the brand's audience is distributed between YouTube and short formats (Reels, Shorts, VK Clips), the combination of "full video + teaser" covers both channels with one script generation instead of two independent productions. For content that exists only in one format, a single mode is sufficient β there's no point in overpaying for a teaser that leads nowhere.