Notes on building iOS apps — Swift, SwiftUI, and the small details of shipping.https://en.kou-works.jp/https://en.kou-works.jp/blog/avassetwriter-expects-media-data-in-real-time/https://en.kou-works.jp/blog/avassetwriter-expects-media-data-in-real-time/Most guides tell you to leave this flag off when you're not capturing live. On device, leaving it off wedged the hardware encoder partway through every 4K export.Fri, 21 Aug 2026 00:00:00 GMT