Reddit pilots AI that turns posts into three‑minute videos

Reddit is rolling out an AI‑driven experiment that auto‑generates three‑minute videos from text posts, adding synthetic voice narration and scrolling captions. The first visible instance appeared on a 2018 r/boardgames thread with 101 comments; each video is labeled “Real conversation voiced by AI.” So far the feature runs on roughly 5 % of eligible posts in eight test subreddits [The Verge].

The pipeline uses a custom TTS model trained on Reddit‑specific speech patterns and a caption‑synchronization engine that scrolls the post text in time with the audio. In its first week the experiment produced 2,000 videos, averaging 45 seconds of watch time per video and delivering a 12 % lift in post‑click engagement versus text‑only threads [Reddit Blog]. Videos are posted as native Reddit video assets with autoplay muted; users can toggle the AI voice on or off. The rollout is limited to English posts longer than 200 characters and excludes NSFW content.

Why it matters: Turning long threads into bite‑size videos reduces friction for users who prefer passive consumption, which can increase time‑on‑site. The video format creates pre‑roll and mid‑roll ad slots, opening a higher‑margin revenue stream for Reddit. Synthetic voices blur the line between genuine user speech and AI‑generated output, raising labeling and moderation challenges. Finally, Reddit’s use of open‑source components such as Coqui TTS and FFmpeg caption sync provides a blueprint that other platforms may adopt, potentially reshaping media‑pipeline engineering across the social web.

Editor's take: The experiment serves Reddit’s data‑capture goals as much as it serves convenience. Converting text into a proprietary video format lets Reddit collect richer interaction signals and steer advertisers toward its own ad stack. Builders should scrutinize licensing terms of the underlying TTS models and plan for the moderation overhead that synthetic speech entails.

── Reader poll ──

Which AI‑generated content format do you prefer for Reddit?

• Audio podcasts (voice‑only)
• Short videos with captions
• Text‑only threads