AVAssetImageGenerator blocks calling thread
Originator: | aditya | ||
Number: | rdar://46687884 | Date Originated: | December 13 2018 11:58 AM |
Status: | Open | Resolved: | |
Product: | iOS + SDK | Product Version: | 12.1.1 |
Classification: | Performance | Reproducible: | Always |
Area: AVFoundation Summary: When calling -[AVAssetImageGenerator generateCGImagesAsynchronouslyForTimes:completionHandler:], the calling thread is blocked for a long time, even though the method is supposed to be asynchronous. This is reproducible when the asset is created using a network URL. Steps to Reproduce: Run the attached sample project. Expected Results: The message "Time for generate method to return: ..." is logged with a small value (ideally less than 0.1s). Actual Results: The message "Time for generate method to return: 2.083s" is logged. This is a very long time for a method to be blocking something when its name says it should be asynchronous. Version/Build: iPhone 7 Plus, iOS 12.1.1. Configuration: Xcode Version 10.1 (10B61), using the iOS 12.1 SDK Sample project: https://github.com/PSPDFKit-labs/radar.apple.com/tree/master/46687884%20-%20AVAssetImageGenerator%20blocks%20calling%20thread
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