AVMutableVideoComposition不會播放

我的設置如下：在我的應用程序的這一部分，用戶可以將視頻放在一行中。這些影片可以讓他們之間的間隙或在稍後的時間爲0AVMutableVideoComposition不會播放

開始爲了實現這一點，我增加了一個功能，每一個縫隙中增加了全黑的視頻循環播放：

func getBlackVideoSegments(timerange: CMTimeRange) -> [AVCompositionTrackSegment] { 
    var compositionTrackSegments = [AVCompositionTrackSegment]() 
    if CMTimeCompare(timerange.duration, RTGlobals.blackVideo.duration) == -1 { 
     let compositionTrackSegment = AVCompositionTrackSegment(URL: RTGlobals.blackVideoURL, trackID: RTGlobals.blackVideoAssetTrack.trackID, sourceTimeRange: CMTimeRangeMake(kCMTimeZero, timerange.duration), targetTimeRange: timerange) 
     compositionTrackSegments.append(compositionTrackSegment) 
     addVideoCompositionInstruction(RTGlobals.blackVideoAssetTrack, timeRange: timerange, assetTrack: videoCompositionTrack) 
    } else { 
     var currentStart = timerange.start 
     var filledDuration = kCMTimeZero 
     while CMTimeCompare(filledDuration, timerange.duration) == -1 { 
      let durationToFill = CMTimeSubtract(timerange.duration, filledDuration) 
      var durationAdded = RTGlobals.blackVideo.duration 
      if CMTimeCompare(durationAdded, durationToFill) == 1 { 
       durationAdded = durationToFill 
      } 

      let compositionTrackSegment = AVCompositionTrackSegment(URL: RTGlobals.blackVideoURL, trackID: RTGlobals.blackVideoAssetTrack.trackID, sourceTimeRange: CMTimeRangeMake(kCMTimeZero, durationAdded), targetTimeRange: CMTimeRangeMake(currentStart, durationAdded)) 
      compositionTrackSegments.append(compositionTrackSegment) 
      addVideoCompositionInstruction(RTGlobals.blackVideoAssetTrack, timeRange: CMTimeRangeMake(currentStart, durationAdded), assetTrack: videoCompositionTrack) 

      currentStart = CMTimeAdd(currentStart, durationAdded) 
      filledDuration = CMTimeAdd(filledDuration, durationAdded) 
     } 
    } 
    return compositionTrackSegments 
}

而且這裏是我如何設置說明：

func addVideoCompositionInstruction(videoAssetTrack: AVAssetTrack, timeRange: CMTimeRange, assetTrack: AVAssetTrack) { 
    let instruction = AVMutableVideoCompositionInstruction() 
    instruction.timeRange = timeRange 
    let layerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: assetTrack) 

    let videoSize = CGSizeMake(1920.0, 1080.0) 

    var transform = videoAssetTrack.preferredTransform 
    var scale:CGFloat = 1.0 
    var offset:CGFloat = 0.0 

    if fabs(videoAssetTrack.preferredTransform.b) == 1.0 && fabs(videoAssetTrack.preferredTransform.c) == 1.0 { 
     scale = videoSize.height/videoAssetTrack.naturalSize.width 
     offset = (videoSize.width - (videoAssetTrack.naturalSize.height * scale))/2.0 
    } else { 
     scale = videoSize.height/videoAssetTrack.naturalSize.height 
    } 
    transform = CGAffineTransformConcat(CGAffineTransformConcat(transform, CGAffineTransformMakeScale(scale, scale)), CGAffineTransformMakeTranslation(offset, 0)) 

    layerInstruction.setTransform(transform, atTime: timeRange.start) 

    instruction.layerInstructions = [layerInstruction] 

    instructions.append(instruction) 
}

說明和細分都是無縫的，並在最後填充整個組成。

但是，每次添加黑色視頻片段時，播放都會失敗。玩家只是在黑色視頻到來的時候停下來。

有沒有人看到這個問題？我無法理解它。

非常感謝！

安德烈亞斯

來源

2016-03-21 Andreas Pitsch

回答我的問題很簡單：只要更新到iOS 9.3 蘋果顯然有此刻破框架。還有一些情況，它不完美，但沒關係。我想它將在9.4中修復

再見！ Andreas

來源

2016-03-24 10:12:11

AVMutableVideoComposition不會播放

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