问题描述
我有多个AVAsset视频，我使用AVComposition中的timeRanges将它们串在一起。每个视频都有一个关联的AVVideoComposition，该animationTool使用AVVideoCompositions向视频添加叠加层。我希望能够以类似于AVComposition的方式将这些AVVideoComposition串在一起，以便与每个AVAset关联的图层在指定的开始/结束时间显示/隐藏。我该怎么办？
我目前使用此代码为具有单个AVAset的AVComposition创建// Create video composition
let videoComposition = AVMutableVideoComposition()
videoComposition.renderSize = videoSize
videoComposition.frameDuration = CMTime(value: 1,timescale: 30)
videoComposition.animationTool = AVVideoCompositionCoreAnimationTool(
postProcessingAsVideoLayer: videoLayer,in: outputLayer
)
let instruction = AVMutableVideoCompositionInstruction()
instruction.timeRange = CMTimeRange(
start: .zero,duration: composition.duration
)
let layerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: compositionTrack)
layerInstruction.setTransform(assetTrack.preferredTransform,at: .zero)
instruction.layerInstructions = [layerInstruction]
videoComposition.instructions = [instruction]
：
AVComposition这是我用于创建具有多个资产的static func createFullVideo(from videos: [VideoItem]) -> AVComposition? {
let newComposition = AVMutableComposition()
guard let compositionTrack = newComposition.addMutableTrack(
withMediaType: .video,preferredTrackID: kCMPersistentTrackID_Invalid) else {
return nil
}
guard let compositionAudioTrack = newComposition.addMutableTrack(
withMediaType: .audio,preferredTrackID: kCMPersistentTrackID_Invalid) else {
return nil
}
var endTimeOfPrevIoUsTrack: CMTime = .zero
for video in videos {
let composition = video.composition
guard let assetTrack = composition.tracks(withMediaType: .video).first else {
return nil
}
compositionTrack.preferredTransform = assetTrack.preferredTransform
do {
// Insert time range for video track in composition
let timeRange = assetTrack.timeRange
try compositionTrack.insertTimeRange(timeRange,of: assetTrack,at: endTimeOfPrevIoUsTrack)
// Get the audio track from the asset
guard let audioAssetTrack = composition.tracks(withMediaType: .audio).first else {
return nil
}
// Insert time range for audio track in composition
try compositionAudioTrack.insertTimeRange(
timeRange,of: audioAssetTrack,at: endTimeOfPrevIoUsTrack
)
// Store end time of track
endTimeOfPrevIoUsTrack = CMTimeAdd(endTimeOfPrevIoUsTrack,assetTrack.timeRange.duration)
} catch {
return nil
}
return newComposition
}
的代码：
watchOS解决方法
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