Short-Form Video Glossary
Short, opinionated definitions of the terms that come up when you're working in short-form video. Each entry explains the term, why it matters, and the practical implication for clip generation and content workflow.
Analytics
Viral score
A viral score is an AI-generated numerical estimate of how likely a candidate video clip is to perform on short-form platforms. AI clip generators compute viral scores by analyzing multiple signals — speech cadence, hook strength, length, visual cuts, emotional peaks — and ranking candidate clips so creators publish the highest-scoring ones first.
Watch time
Watch time is the cumulative duration viewers spend watching a video, expressed either as average watch duration per view or as percentage retention curve across the clip's length. For short-form algorithms (TikTok, Reels, Shorts), watch time is the dominant ranking signal — clips with high retention get distributed to more feeds regardless of like/comment counts.
Distribution
Watermark
A watermark is a visible logo, text, or graphic overlay embedded on a video, typically used to attribute the creator or the production tool. In short-form video, platform watermarks (TikTok's bouncing logo, the Reels stamp) reduce cross-platform reach because algorithms detect and downweight clips imported from competing platforms.
Short-form video
Short-form video is the category of video content typically 15 to 90 seconds long, formatted in 9:16 vertical aspect ratio, designed for thumb-scrollable mobile feeds. The dominant short-form platforms in 2026 are TikTok, Instagram Reels, YouTube Shorts, and Snapchat Spotlight. Long-form video (3+ minutes) lives on YouTube and traditional video platforms.
Content repurposing
Content repurposing is the practice of taking a single piece of long-form content (a podcast episode, webinar, YouTube video, live stream, or course module) and converting it into multiple shorter formats distributed across different platforms. AI clip generators are the modern repurposing tool — they automate the long-to-short conversion that previously required manual editing.
Editing
Viral hook
A viral hook is the first 1–3 seconds of a short-form video clip — the line, image, or question designed to stop the thumb-scroll and earn the next 5 seconds of attention. In 2026, hooks that lead with a specific number, a stand-alone declarative sentence, or a contradiction outperform vague openers by an order of magnitude in retention.
B-roll
B-roll is supplementary footage cut into a video to support or illustrate the main A-roll (the speaker on camera). In short-form video, B-roll is typically 1–4 second inserts of relevant imagery, gameplay, screen recordings, or stock footage that visualize what the speaker is describing. Used well, B-roll boosts retention; used to cover the punchline, it kills replay.
Jump cut
A jump cut is a video edit that removes time between two similar shots, creating a visible discontinuity in the speaker's position or framing. In short-form video, jump cuts compress speech (cutting out pauses, filler words, slow segments) to maintain the fast pacing the format demands. A well-executed jump cut every 3–5 seconds keeps retention high.
Auto-captions
Auto-captions are AI-generated subtitles that transcribe spoken audio into on-screen text in real time during video playback. In short-form video, auto-captions are mandatory — roughly 85% of social feed playback happens with sound off, and uncaptioned clips lose retention immediately. Modern auto-caption quality on English audio runs 95%+ accurate.
Production
Aspect ratio
Aspect ratio is the proportional relationship between a video's width and height, expressed as width:height. The dominant short-form ratio in 2026 is 9:16 (vertical, 1080×1920) used by TikTok, Instagram Reels, and YouTube Shorts. Long-form video uses 16:9 (1920×1080). Square 1:1 is used by LinkedIn and Instagram feed.
Auto-reframe
Auto-reframe is an AI feature that converts a video from one aspect ratio to another by tracking the subject (typically the active speaker's face) across frames and re-cropping the output to keep the subject centered. The dominant use case is converting 16:9 source footage into 9:16 vertical clips for TikTok, Reels, and YouTube Shorts.
Transcription
Transcription is the process of converting spoken audio into written text. In AI clip generators, transcription is the foundation step — every other feature (auto-captions, viral-clip scoring, semantic search across the source) depends on accurate transcription. Modern speech-to-text models hit 95%+ accuracy on clear English audio with native speakers.