We are Nonstrict

Incorrect output when writing a single AVTimedMetadataGroup

Timed metadata can be written to a track using AVAssetWriter. However if you append only one AVTimedMetadataGroup the results will be unexpected due to buggy behaviour.

Working with custom metadata in mp4 files

It is very useful, but also quite a pain to work with custom metadata in mp4 files with AVFoundation. Let's bridge the undocumented gaps and get it to work.

Stretching an audio file using Swift

Stretching an audio file to a certain length can be useful to fix lipsync issues. It isn't immediatly obvious how to do this using Swift. Here is a simple way to do it.