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목표는 동영상의 임의 부분을 내보내는 것입니다 (예 : 중간 세 번째, 마지막 절반). AVAssetExportSession은 시작 지점이 동영상의 시작 인 경우에만 성공합니다. cmStartTime가 0이 아니면임의의 동영상 세그먼트를 내보내는 방법은 무엇인가요? 마지막 X 초의 동영상을 내보낼 때 '작업이 중지되었습니다.'오류가 발생했습니다.
, AVAssetExportSession이 오류와 함께 실패합니다
Failed: Optional(Error Domain=AVFoundationErrorDomain Code=-11841 "Operation Stopped" UserInfo=0x175872d00 {NSLocalizedDescription=Operation Stopped, NSLocalizedFailureReason=The video could not be composed.}).
// Create main composition & its tracks
let mainComposition = AVMutableComposition()
let compositionVideoTrack = mainComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID(kCMPersistentTrackID_Invalid))
let compositionAudioTrack = mainComposition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID(kCMPersistentTrackID_Invalid))
// Get source video & audio tracks
let videoURL = NSURL(fileURLWithPath: fileURL)
let videoAsset = AVURLAsset(URL: videoURL, options: nil)
let sourceVideoTrack = videoAsset.tracksWithMediaType(AVMediaTypeVideo)[0]
let sourceAudioTrack = videoAsset.tracksWithMediaType(AVMediaTypeAudio)[0]
// Define time values for video
let timescale = Int32(600)
let cmStartTime = CMTimeMake(Int64(CGFloat(0.5) * CGFloat(timescale)), timescale)
let cmEndTime = CMTimeMake(10, 1)
let timeRange = CMTimeRangeMake(cmStartTime, cmEndTime)
// Add source tracks to composition
do {
try compositionVideoTrack.insertTimeRange(timeRange, ofTrack: sourceVideoTrack, atTime: cmStartTime)
try compositionAudioTrack.insertTimeRange(timeRange, ofTrack: sourceAudioTrack, atTime: cmStartTime)
} catch {
printError("Error with insertTimeRange while exporting video: \(error)")
}
// Create video composition
let renderSize = compositionVideoTrack.naturalSize
let videoComposition = AVMutableVideoComposition()
videoComposition.renderSize = renderSize
videoComposition.frameDuration = CMTimeMake(Int64(1), Int32(frameRate))
// Add layer instruction to video composition
...
// Apply effects to video
...
// Define export URL
let exportPath = getUniqueTempPath(gMP4File)
let exportURL = NSURL(fileURLWithPath: exportPath)
// Create exporter
let exporter = AVAssetExportSession(asset: mainComposition, presetName: AVAssetExportPresetHighestQuality)!
exporter.videoComposition = videoComposition
exporter.outputFileType = AVFileTypeMPEG4
exporter.outputURL = exportURL
exporter.shouldOptimizeForNetworkUse = true
exporters.append(exporter)
// Export video
exporter.exportAsynchronouslyWithCompletionHandler() {
// Finish stuff
}