{"slug": "show-hn-s-roll-local-ai-video-understanding-and-clipping-for-mac", "title": "Show HN: S-Roll – local AI video understanding and clipping for Mac", "summary": "A developer launched S-Roll, a macOS app that performs AI video understanding, transcription, and clipping entirely on-device, according to the Show HN post. S-Roll lets users chat with long-form video to locate specific moments and convert them into vertical clips, with subject tracking that keeps a chosen person or object in frame. The app is available at saliency.dev/s-roll and the post had drawn 1 point and 0 comments on Hacker News.", "body_md": "Hi HN,\n\nI built S-Roll, a macOS app for turning long-form video into clips entirely on-device.\n\nDrop in podcasts, gameplay videos, or other long videos and get shorts or viral reels instantly.\n\nYou can chat with the video to find a specific moment and turn it directly into a clip. S-Roll also does subject tracking, so the person or object you care about stays in frame when converting to vertical video.\n\nEverything runs locally on your Mac, including transcription and video understanding.\n\nS-Roll: [https://saliency.dev/s-roll](https://saliency.dev/s-roll)\n\nDiscord: [https://discord.gg/B6HnneePm](https://discord.gg/B6HnneePm)\n\nWould love feedback :)\n\nComments URL: [https://news.ycombinator.com/item?id=49743661](https://news.ycombinator.com/item?id=49743661)\n\nPoints: 1\n\n# Comments: 0", "url": "https://wpnews.pro/news/show-hn-s-roll-local-ai-video-understanding-and-clipping-for-mac", "canonical_source": "https://saliency.dev/s-roll", "published_at": "2026-09-17 17:09:32+00:00", "updated_at": "2026-09-17 17:26:37.250300+00:00", "lang": "en", "topics": ["ai-products", "ai-tools", "computer-vision", "generative-ai"], "entities": ["S-Roll", "macOS", "Hacker News", "saliency.dev", "Discord"], "alternates": {"html": "https://wpnews.pro/news/show-hn-s-roll-local-ai-video-understanding-and-clipping-for-mac", "markdown": "https://wpnews.pro/news/show-hn-s-roll-local-ai-video-understanding-and-clipping-for-mac.md", "text": "https://wpnews.pro/news/show-hn-s-roll-local-ai-video-understanding-and-clipping-for-mac.txt", "jsonld": "https://wpnews.pro/news/show-hn-s-roll-local-ai-video-understanding-and-clipping-for-mac.jsonld"}}