在设备上导出时 AVAssetExportSession 缺少音轨
我在模拟器上运行导出，一切正常。我在设备上运行它，视频被导出，但没有音频。这让我相信我一定使用了设备不支持但 OS X 支持的音频格式，因为模拟器使用 OS X 使用的音频格式。我尝试过 m4a、aiff 和 aifc，但没有成功！有什么想法吗？
I run the export on the simulator and everything works great. I run it on the device and the video gets exported but there's no audio. This leads me to believe that I must be using an audio format that the device doesn't support but OS X does, as the simulator uses what OS X uses. I've tried m4a, aiff, and aifc and have had no luck! Any ideas??
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我有一个非常相似的问题。这似乎与编解码器无关，因为我制作了一个单独的测试用例，可以在同一视频上正常运行。有一个相关问题，指出问题可能出在使用
MPMoviePlayerController播放相同资源时。这让我走上了正确的道路（某种程度上）。就我而言，问题源于在导出期间使用
AVPlayer中的资源。我无法找到导致导出丢失音轨的确切组合 - 在单独的测试项目中，即使资产同时在AVPlayer中播放，导出也运行良好。经过几个小时的尝试找到确切原因后，我放弃了，只是在导出过程中使用replaceCurrentItemWithPlayerItem:nil将资产从播放器中弹出。这是一个黑客，但它有效。AVFoundation 是一个非常强大的框架，但上帝我希望它不要那么挑剔，或者至少记录更多错误，而不是默默地产生垃圾。
I have a very similar problem. It does not seem to do with codecs, as I made a separate test case that runs fine with the same video. There’s a related question that says the problem might be in playing the same assets using
MPMoviePlayerController. That got me on the right track (sort of).In my case the trouble stem from using the assets in an
AVPlayerduring the export. I was not able to find the exact combination that causes the export to drop the audio track – in the separate test project the export runs fine even though the asset plays inAVPlayerat the same time. After several hours of trying to find the exact cause I gave up and simply popped the asset out of the player usingreplaceCurrentItemWithPlayerItem:nilduring export. It’s a hack, but it works.AVFoundationis a very powerful framework, but God I wish it wasn’t so finicky or at least logged more errors instead of silently producing garbage.