使用 PHImageManager 导出视频文件 fails:AVFoundationErrorDomain Code=-11800 "The operation could not be completed" Code=-12212

Question

我正在尝试使用 Photos iOS SDK 中的 PHImageManager 从模拟器上的相机胶卷导出视频资产。执行导出完成块时，会导致此错误：

Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSLocalizedFailureReason=An unknown error occurred (-12212), NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x600001baa4c0 {Error Domain=NSOSStatusErrorDomain Code=-12212 "(null)"}}

每次模拟器相机胶卷上的指定视频都会发生这种情况。但是，这在真实设备上并不一致；有些视频可以正常导出，有些则不行。

为什么会发生这种情况，如何修复它，在哪里可以找到错误代码文档？

这是它发生的函数：

public func exportVideoFile(
        options: PHVideoRequestOptions? = nil,
        outputURL: URL? = nil,
        outputFileType: AVFileType = .mov,
        progressBlock: ((Double) -> Void)? = nil,
        completionBlock: @escaping ((URL, String) -> Void)
    ) {
        guard
            let phAsset = self.phAsset,
            phAsset.mediaType == .video,
            let writeURL = videoFilename(phAsset: phAsset),
            let mimetype = MIMEType(writeURL)
        else { return }

        var requestOptions = PHVideoRequestOptions()
        if let options = options {
            requestOptions = options
        } else {
            requestOptions.isNetworkAccessAllowed = true
            requestOptions.deliveryMode = .fastFormat
        }
        requestOptions.progressHandler = { progress, _, _, _ in
            DispatchQueue.main.async {
                debugPrint("progress", progress)
                progressBlock?(progress)
            }
        }

        PHImageManager.default().requestExportSession(
            forVideo: phAsset, options: requestOptions,
            exportPreset: AVAssetExportPreset1280x720
        ) { session, _ in
            guard let session = session else { return }

            session.outputURL = writeURL
            session.outputFileType = outputFileType
            session.shouldOptimizeForNetworkUse = true

            session.exportAsynchronously {
                completionBlock(writeURL, mimetype)
                
                if let err = session.error { // Error happens here
                    debugPrint("Video Export Session Error: \(err.localizedDescription)")
                } else {
                    debugPrint("Video Export Session Status: \(session.status)")
                }
            }
        }
    }

Answer 1

解法：

我发现错误代码“-12212”指的是 kVTColorCorrectionPixelTransferFailedErr。

所以我认为这一定是预设或质量设置问题...

我之前曾尝试设置 requestOptions.deliveryMode = .highQualityFormat 但那没有用。但是，我注意到以下调用具有质量预设：

PHImageManager.default().requestExportSession(
            forVideo: phAsset, options: requestOptions,
            exportPreset: AVAssetExportPreset1280x720
        )

当我把它改成这样的时候：

PHImageManager.default().requestExportSession(
            forVideo: phAsset, options: requestOptions,
            exportPreset: AVAssetExportPresetHighestQuality
        )

成功了！

使用 PHImageManager 导出视频文件 fails:AVFoundationErrorDomain Code=-11800 "The operation could not be completed" Code=-12212

Export of Video file using PHImageManager fails:AVFoundationErrorDomain Code=-11800 "The operation could not be completed" Code=-12212

ios

swift

phphotolibrary