合并两个音频文件失败

Question

Domain=AVFoundationErrorDomain Code=-11838 \"Operation Stopped\" UserInfo={NSLocalizedDescription=Operation Stopped, NSLocalizedFailureReason=此媒体不支持该操作。})")

{来源：caf lpcm，目的地：aiff or wav or caf}

代码如下：

        let composition = AVMutableComposition()
        self.prepareToCombineMedia(composition)

        let exportSession = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetPassthrough)!

        let tmpFilePath = FileUtils.tempFile(ext: "caf")
        exportSession.outputURL = NSURL.fileURL(withPath: tmpFilePath)
        exportSession.outputFileType = AVFileTypeCoreAudioFormat
        exportSession.exportAsynchronously {
            if exportSession.status == .completed {
                print("completed")
                print(tmpFilePath)
                subscriber.onCompleted()
            } else {
                subscriber.onError(LeafError.runtime(message: exportSession.error.debugDescription))
                FileUtils.rm(tmpFilePath)
            }
        }

它只能合并到 m4a 或 mov。我需要 caf 或 wav 或 aiff 文件，帮助...

Answer 1

替换这一行：

let exportSession = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetPassthrough)!

与：

let exportSession = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetAppleM4A)

希望它会起作用