AVFoundation是苹果公司为iOS和macOS开发的一个多媒体框架,它提供了一组丰富的API和工具,用于处理音频和视频。AVFoundation不仅可以用于播放、录制和编辑音视频,还支持实时音视频的采集和处理。
对于合并多个视频并仅播放最后一个视频的需求,可以通过以下步骤实现:
import AVFoundation
let composition = AVMutableComposition()
let videoTrack = composition.addMutableTrack(withMediaType: .video, preferredTrackID: kCMPersistentTrackID_Invalid)
let assetTrack = asset.tracks(withMediaType: .video).first
try? videoTrack?.insertTimeRange(CMTimeRangeMake(start: .zero, duration: asset.duration), of: assetTrack!, at: composition.duration)
let videoComposition = AVMutableVideoComposition()
videoComposition.renderSize = CGSize(width: videoTrack!.naturalSize.width, height: videoTrack!.naturalSize.height)
let instruction = AVMutableVideoCompositionInstruction()
instruction.timeRange = CMTimeRangeMake(start: .zero, duration: composition.duration)
let layerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: videoTrack!)
layerInstruction.setTransform(videoTrack!.preferredTransform, at: .zero)
instruction.layerInstructions = [layerInstruction]
videoComposition.instructions = [instruction]
let playerItem = AVPlayerItem(asset: composition)
playerItem.videoComposition = videoComposition
let player = AVPlayer(playerItem: playerItem)
let playerLayer = AVPlayerLayer(player: player)
playerLayer.frame = view.bounds
view.layer.addSublayer(playerLayer)
player.play()
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以上是基于AVFoundation实现合并多个视频并仅播放最后一个视频的示例代码,可以根据具体需求进行调整和扩展。
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