AVAssetWriter crash creating CMAF compliant segments

Using AVAssetWriter to create CMAF compliant segments in realtime is unstable on Intel macs when the frame rate is dynamic. You either need to switch away from CMAF, disable expectsMediaDataInRealTime or ensure a stable frame rate.

Mentioning SCStreamError crashes on older macOS versions

A public service annoucement for those using ScreenCaptureKit in an app that also needs to run on macOS < 12.3 (Monterey).

Recording to disk using ScreenCaptureKit

Saving a screen capture to disk has some interesting edge cases when using ScreenCaptureKit. The documentation and WWDC videos don't really cover using the captured frame samples. We created an example.

Using async/await in a commandline tool on older macOS versions

Building a commandline tool using Swift concurrency isn't as straight forward as you'd hope. Running on macOS pre-12 linker errors appear and back deployment is undocumented. We figured it out and documented it in this article.

Recording to disk using AVCaptureScreenInput

On older macOS versions, ScreenCaptureKit isn't available. We created an example project demonstrating screen recording using the older AVCaptureScreenInput.