在后台启动AVAssetExportSession [英] Starting AVAssetExportSession in the Background

问题描述

我的应用程序进行了一些处理，在某些时候它需要调用AVAssetExportSession。

My app does some processing and at some point it needs to call an AVAssetExportSession.

如果会话已经开始，然后我对应用程序进行后台处理，一切都正常完成。但是，如果我在调用 exportAsynchronouslyWithCompletionHandler 之前对应用程序进行后台处理。我收到此错误：

If the session has already started and then I background the app, everything completes normally. However, if I background the app before calling exportAsynchronouslyWithCompletionHandler. I get this error:

AVAssetExportSessionStatusFailed错误域= AVFoundationErrorDomain代码= -11800操作无法完成UserInfo = 0x1e550db0 {NSLocalizedFailureReason = An发生未知错误（-12985），NSUnderlyingError = 0x1e574910操作无法完成。（OSStatus error -12985。），NSLocalizedDescription =操作无法完成}

是否可以在后台启动AVAssetExportSession？

Is it possible to start an AVAssetExportSession in the background?

推荐答案

实际上并非如此可能是因为您无法在后台启动新线程。如果你想在后台做很多事情，你必须在app背景之前异步启动它们。

It actually is not possible due to the fact that you can't start a new thread in the background. If you want to do a lot of things in the background you'll have to start them all asynchronously right before the app backgrounds.

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