我正在使用AVMutableComposition合并视频，当两个视频具有相同类型，例如mp4个视频或两个mov个视频时，效果很好。
但是，如果我尝试将mp4的一个视频和mov的一个视频合并，则合并的视频在第一个视频完成后就会停止。
答案 0 :(得分：1)
您可以使用此代码
private func mergeAssets(arrayAssets:[AVAsset],audioAsset:AVAsset,completionHandler:@escaping MergedVideoCompletionHandler){
var insertTime = kCMTimeZero
let animation = true
var arrayLayerInstructions:[AVMutableVideoCompositionLayerInstruction] = []
var outputSize = CGSize.init(width: 0, height: 0)
// Determine video output size
for videoAsset in arrayAssets {
let videoTrack = videoAsset.tracks(withMediaType: AVMediaType.video)[0]
let assetInfo = orientationFromTransform(transform: videoTrack.preferredTransform)
var videoSize = videoTrack.naturalSize
if assetInfo.isPortrait == true {
videoSize.width = videoTrack.naturalSize.height
videoSize.height = videoTrack.naturalSize.width
}
if videoSize.height > outputSize.height {
outputSize = videoSize
}
}
if outputSize.width == 0 || outputSize.height == 0 {
outputSize = defaultSize
}
let audioSoundTrack = audioAsset.tracks(withMediaType: AVMediaType.audio).first
// Init composition
let mixComposition = AVMutableComposition.init()
for videoAsset in arrayAssets {
// Get video track
guard let videoTrack = videoAsset.tracks(withMediaType: AVMediaType.video).first else { continue }
// Get audio track
// Init video & audio composition track
let videoCompositionTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.video,
preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
let audioCompositionTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.audio,
preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
do {
let startTime = kCMTimeZero
let duration = videoAsset.duration
// Add video track to video composition at specific time
try videoCompositionTrack?.insertTimeRange(CMTimeRangeMake(startTime, duration),
of: videoTrack,
at: insertTime)
// Add audio track to audio composition at specific time
if let audioTrack = audioSoundTrack {
try audioCompositionTrack?.insertTimeRange(CMTimeRangeMake(startTime, duration),
of: audioTrack,
at: insertTime)
}
// Add instruction for video track
let layerInstruction = videoCompositionInstructionForTrack(track: videoCompositionTrack!,
asset: videoAsset,
standardSize: outputSize,
atTime: insertTime)
// Hide video track before changing to new track
let endTime = CMTimeAdd(insertTime, duration)
if animation {
let timeScale = videoAsset.duration.timescale
let durationAnimation = CMTime.init(seconds: 1, preferredTimescale: timeScale)
layerInstruction.setOpacityRamp(fromStartOpacity: 1.0, toEndOpacity: 0.0, timeRange: CMTimeRange.init(start: endTime, duration: durationAnimation))
}
else {
layerInstruction.setOpacity(0, at: endTime)
}
arrayLayerInstructions.append(layerInstruction)
// Increase the insert time
insertTime = CMTimeAdd(insertTime, duration)
}
catch {
let appError = getAppError(error, message: "Failed to loadvideoTrack")
completionHandler(nil,appError)
}
}
// Main video composition instruction
let mainInstruction = AVMutableVideoCompositionInstruction()
mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, insertTime)
mainInstruction.layerInstructions = arrayLayerInstructions
// Main video composition
let mainComposition = AVMutableVideoComposition()
mainComposition.instructions = [mainInstruction]
mainComposition.frameDuration = CMTimeMake(1, 30)
mainComposition.renderSize = outputSize
let path = NSTemporaryDirectory().appending("mergedVideo.mp4")
let exportURL = URL.init(fileURLWithPath: path)
// Remove file if existed
FileManager.default.removeItemIfExisted(exportURL)
// //4 - Get path
// let fileName = IGMediaUtil.createNewFile(fileName: "mergeVideo", fileExtension: "mp4")
// guard let docSubFolder = IGMediaUtil.createFolderInDoc(folderName: Constants.kMergedVideosFolder) else{
// return
// }
// let mergingURL = docSubFolder.appendingPathComponent(fileName)
// // Remove file if existed
// FileManager.default.removeItemIfExisted(mergingURL)
let exporter = AVAssetExportSession.init(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)
exporter?.outputURL = exportURL
exporter?.outputFileType = AVFileType.mp4
exporter?.shouldOptimizeForNetworkUse = true
exporter?.videoComposition = mainComposition
// Do export
exporter?.exportAsynchronously(completionHandler: {
DispatchQueue.main.async {
self.exportDidFinish(exporter: exporter, videoURL: exportURL)
}
})
}
fileprivate func exportDidFinish(exporter:AVAssetExportSession?, videoURL:URL) {
var progressValue:Float = 0
if let status = exporter?.status {
switch status{
case .exporting:
progressValue = (exporter?.progress)!
case .failed, .cancelled,.unknown:
progressValue = 1.0
let appError = self.getAppError(exporter?.error,message:"Failed to create Data")
print( "localizedDescription ::::::AVExport ********** \(exporter?.error?.localizedDescription)" ?? "No Error")
print(exporter?.error.debugDescription)
if let exportBlock = self.callback{
exportBlock(nil ,appError)
}
case .waiting:
break
case .completed:
progressValue = 1.0;
print("Exported file: \(videoURL.absoluteString)")
if let exportBlock = self.callback{
exportBlock(videoURL ,nil)
}
}
if let progressBlock = self.progressCallback{
DispatchQueue.main.async {
progressBlock(progressValue)
}
}
}
}
}
extension MediaAudioMergerServiceManager{
fileprivate func orientationFromTransform(transform: CGAffineTransform) -> (orientation: UIImageOrientation, isPortrait: Bool) {
var assetOrientation = UIImageOrientation.up
var isPortrait = false
if transform.a == 0 && transform.b == 1.0 && transform.c == -1.0 && transform.d == 0 {
assetOrientation = .right
isPortrait = true
} else if transform.a == 0 && transform.b == -1.0 && transform.c == 1.0 && transform.d == 0 {
assetOrientation = .left
isPortrait = true
} else if transform.a == 1.0 && transform.b == 0 && transform.c == 0 && transform.d == 1.0 {
assetOrientation = .up
} else if transform.a == -1.0 && transform.b == 0 && transform.c == 0 && transform.d == -1.0 {
assetOrientation = .down
}
return (assetOrientation, isPortrait)
}
fileprivate func videoCompositionInstructionForTrack(track: AVCompositionTrack, asset: AVAsset, standardSize:CGSize, atTime: CMTime) -> AVMutableVideoCompositionLayerInstruction {
let instruction = AVMutableVideoCompositionLayerInstruction(assetTrack: track)
let assetTrack = asset.tracks(withMediaType: AVMediaType.video)[0]
let transform = assetTrack.preferredTransform
let assetInfo = orientationFromTransform(transform: transform)
var aspectFillRatio:CGFloat = 1
if assetTrack.naturalSize.height < assetTrack.naturalSize.width {
aspectFillRatio = standardSize.height / assetTrack.naturalSize.height
}
else {
aspectFillRatio = standardSize.width / assetTrack.naturalSize.width
}
if assetInfo.isPortrait {
let scaleFactor = CGAffineTransform(scaleX: aspectFillRatio, y: aspectFillRatio)
let posX = standardSize.width/2 - (assetTrack.naturalSize.height * aspectFillRatio)/2
let posY = standardSize.height/2 - (assetTrack.naturalSize.width * aspectFillRatio)/2
let moveFactor = CGAffineTransform(translationX: posX, y: posY)
instruction.setTransform(assetTrack.preferredTransform.concatenating(scaleFactor).concatenating(moveFactor), at: atTime)
} else {
let scaleFactor = CGAffineTransform(scaleX: aspectFillRatio, y: aspectFillRatio)
let posX = standardSize.width/2 - (assetTrack.naturalSize.width * aspectFillRatio)/2
let posY = standardSize.height/2 - (assetTrack.naturalSize.height * aspectFillRatio)/2
let moveFactor = CGAffineTransform(translationX: posX, y: posY)
var concat = assetTrack.preferredTransform.concatenating(scaleFactor).concatenating(moveFactor)
if assetInfo.orientation == .down {
let fixUpsideDown = CGAffineTransform(rotationAngle: CGFloat(Double.pi))
concat = fixUpsideDown.concatenating(scaleFactor).concatenating(moveFactor)
}
instruction.setTransform(concat, at: atTime)
}
return instruction
}
fileprivate func exportDidFinish(exporter:AVAssetExportSession?, videoURL:URL) {
var progressValue:Float = 0
if let status = exporter?.status {
switch status{
case .exporting:
progressValue = (exporter?.progress)!
case .failed, .cancelled,.unknown:
progressValue = 1.0
let appError = self.getAppError(exporter?.error,message:"Failed to create Data")
print( "localizedDescription ::::::AVExport ********** \(exporter?.error?.localizedDescription)" ?? "No Error")
print(exporter?.error.debugDescription)
if let exportBlock = self.callback{
exportBlock(nil ,appError)
}
case .waiting:
break
case .completed:
progressValue = 1.0;
print("Exported file: \(videoURL.absoluteString)")
if let exportBlock = self.callback{
exportBlock(videoURL ,nil)
}
}
if let progressBlock = self.progressCallback{
DispatchQueue.main.async {
progressBlock(progressValue)
}
}
}
}
}