Original Summary

Hey everyone, I wanted to share a major upgrade we just shipped for AetherCut , an app focused on keeping video editing 100% privacy-first and local. Most mobile video editors force a massive compromise: you either build a lightweight app that pushes heavy rendering to a cloud server, or you fight hardware constraints to keep everything local. We chose the hard way. By pairing React with native browser WebCodecs and MediaRecorder APIs , we route all video processing directly to the device’s own GPU. If you open your browser DevTools while editing, you’ll see zero outbound video data . We just rolled out a massive mobile editor upgrade focusing on localized timelines and transition matrices. Here is what we built and how we handled it under the hood: 🚀 What's New in the Mobile Upgrade Native Capture & Dual-Handle Trimming: Record clips directly inside the app (front/rear camera) and trim frames immediately with a custom dual-handle slider UI. On-Device Reel Assembly: Join multiple clips into one reel locally. Every clip is cut to its own trim completely client-side. Timeline Reordering: Added drag-and-drop reordering by long-pressing clip tabs (or using precision ◀ ▶ arrows) backed by a one-tap Undo state stack. Each clip tab dynamically renders a first-frame thumbnail. Per-Boundary Transitions: Instead of global effects, users can set hard cuts, crossfades, slides (push), or wipes per boundary. Includes directional control (up/down/left/right) and precise timing intervals from 0.2s to 1s. UI Polish: Animated CSS/Canvas previews on every transition button so users choose by sight. The app also remembers your favorite style for smart defaults next time. 🛠️ The Technical Hurdles (For the Devs) Managing memory and state when handling multiple high-definition video assets simultaneously on mobile is brutal. State vs. GPU Synchronization: We had to ensure that React’s component state tightly mirrors the low-level WebCodecs decode/encode pipeline without introducing UI blocking loops. Transition Matrices: Calculating real-time directional slide and wipe transitions locally on lower-end mobile devices required strict optimization of our rendering loops to prevent frame drops. UI Layout Quirks: We fought some interesting mobile styling bugs during testing—specifically a modal centering issue caused by Radix ScrollArea’s display: table viewport and various viewport overflows on compact screens. 📱 Try It Out https://play.google.com/store/apps/details?id=app.aethercut.twa&pcampaignid=web_share The app is fully production-ready and passing 100+ automated regression tests. If you want to check out the layout or audit the network traffic yourself, you can grab it here:   submitted by   /u/Sad-Cartographer-328 [link]   [comments]

  • 情报分类：商业与市场研究
  • 分类依据：内容涉及商业、投资或市场动态
  • 信息来源：Reddit · SideProject
  • 发布时间：2026/10/3 06:26:11