Ios 合并视频但AVAssetExportSession从未完成
尝试将一些视频合并在一起并将其导出为单个文件,从教程/示例来看,一切似乎都是正确的。然而,我的AVAssetExportSession似乎从未完成,并且我的视频文件从未导出,对于我丢失的一个明显错误的任何帮助,我们将不胜感激 下面是我合并视频的功能 注意循环中的“videos”是一个成员变量Ios 合并视频但AVAssetExportSession从未完成,ios,video,swift2,avassetexportsession,Ios,Video,Swift2,Avassetexportsession,尝试将一些视频合并在一起并将其导出为单个文件,从教程/示例来看,一切似乎都是正确的。然而,我的AVAssetExportSession似乎从未完成,并且我的视频文件从未导出,对于我丢失的一个明显错误的任何帮助,我们将不胜感激 下面是我合并视频的功能 注意循环中的“videos”是一个成员变量var videos=[AVAsset](),它在调用merge之前被填充(我也检查了) private func merge() { // Create AVMutableComposition t
var videos=[AVAsset]()
,它在调用merge之前被填充(我也检查了)
private func merge()
{
// Create AVMutableComposition to contain all AVMutableComposition tracks
var mix_composition = AVMutableComposition()
var total_time_seconds = 0.0
var tracks = [AVCompositionTrack]()
// Loop over videos and create tracks, keep incrementing total duration
for video in videos
{
// Create the composition track for this video
let track = mix_composition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
// Add video duration to total time
total_time_seconds = total_time_seconds + video.duration.seconds
// Add track to array of tracks
tracks.append(track)
// Add time range to track
do
{
try track.insertTimeRange(CMTimeRangeMake(kCMTimeZero, video.duration), ofTrack: video.tracksWithMediaType(AVMediaTypeVideo)[0], atTime: video.duration)
}
catch _
{
}
}
// Set total time
let preferred_time_scale: Int32 = 600;
let total_time = CMTimeMakeWithSeconds(total_time_seconds, preferred_time_scale)
// Create main instrcution for video composition
let main_instruction = AVMutableVideoCompositionInstruction()
main_instruction.timeRange = CMTimeRangeMake(kCMTimeZero, total_time)
// Create array to hold instructions
var layer_instructions = [AVVideoCompositionLayerInstruction]()
// Ensure we have the same number of tracks as videos
if videos.count == tracks.count
{
// Loop number of videos and tracks
for var index = 0; index < videos.count; ++index
{
// Create compositioninstruction for each track
let instruction = videoCompositionInstructionForTrack(tracks[index], asset: videos[index])
if(index == 0)
{
instruction.setOpacity(0.0, atTime: videos[index].duration)
}
// Add instruction to instructions array
layer_instructions.append(instruction)
}
}
// Set tack instructions to main instruction
main_instruction.layerInstructions = layer_instructions
let main_composition = AVMutableVideoComposition()
main_composition.instructions = [main_instruction]
main_composition.frameDuration = CMTimeMake(1, 30)
main_composition.renderSize = CGSize(width: UIScreen.mainScreen().bounds.width, height: UIScreen.mainScreen().bounds.height)
// Get path for Final video in the current project directory
let documents_url = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
let final_url = documents_url.URLByAppendingPathComponent("TEST.mp4")
// Create AV Export Session
let exporter = AVAssetExportSession(asset: mix_composition, presetName: AVAssetExportPresetHighestQuality)
exporter!.outputURL = final_url
exporter!.outputFileType = AVFileTypeMPEG4
exporter!.shouldOptimizeForNetworkUse = true
exporter!.videoComposition = main_composition
// Perform the Export
exporter!.exportAsynchronouslyWithCompletionHandler() {
dispatch_async(dispatch_get_main_queue(), { () -> Void in
self.exportDidFinish(exporter!)
})
}
}
打印会话状态显示它是4,这是失败的,所以我打印了session.error并得到了这个,但我不确定它的意思,任何帮助都会很好
Optional(Error Domain=AVFoundationErrorDomain Code=-11841 "Operation Stopped" UserInfo={NSLocalizedDescription=Operation Stopped, NSLocalizedFailureReason=The video could not be composed.})
如果调用了
exportDidFinish
,但未发生任何事情,则会话的状态不是AVAssetExportSessionStatus.Completed
。它可能是AVAssetExportSessionStatus.Failed
,或其他一些值。检查这些值,如果确实失败,请检查session.error属性以了解更多信息
编辑:如果希望一个视频一个接一个播放,请仅创建一个AVMutableCompositionTrack
。有关更改,请参见下文:
...
var mix_composition = AVMutableComposition()
// Create the composition track for the videos
let track = mix_composition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
//keep track of total time
var totalTime = kCMTimeZero
for video in videos
{
// Add time range to track
do
{
let videoTrack = video.tracksWithMediaType(AVMediaTypeVideo)[0]
let videoDuration = videoTrack.duration
let timeRange = CMTimeRangeMake(kCMTimeZero,videoDuration)
try track.insertTimeRange(timeRange, ofTrack: videoTrack, atTime: totalTime)
totalTime = CMTimeAdd(totalTime,videoDuration)
}
catch _
{
}
}
// Create main instruction for video composition
let main_instruction = AVMutableVideoCompositionInstruction()
main_instruction.timeRange = CMTimeRangeMake(kCMTimeZero, totalTime)
// Create array to hold instructions
var layer_instructions = [AVVideoCompositionLayerInstruction]()
// Create layer instruction
let layerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: track)
// Add it to the array
layer_instructions.append(layerInstruction)
...
您还需要将渲染调整到适当的位置。视频的大小可能与屏幕大小不同 如何实际检查打印状态的值,但它只是说
“AVAssetExportSessionStatus”
print(session!.status.rawValue)。然后打印(session!.error)ok,状态4失败,我得到了这个错误'Optional(error Domain=AVFoundationErrorDomain Code=-11841“操作已停止”UserInfo={NSLocalizedDescription=Operation Stopped,NSLocalizedFailureReason=视频无法合成。}')我今晚会试试,并告诉你这是怎么回事,谢谢你的回答
...
var mix_composition = AVMutableComposition()
// Create the composition track for the videos
let track = mix_composition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
//keep track of total time
var totalTime = kCMTimeZero
for video in videos
{
// Add time range to track
do
{
let videoTrack = video.tracksWithMediaType(AVMediaTypeVideo)[0]
let videoDuration = videoTrack.duration
let timeRange = CMTimeRangeMake(kCMTimeZero,videoDuration)
try track.insertTimeRange(timeRange, ofTrack: videoTrack, atTime: totalTime)
totalTime = CMTimeAdd(totalTime,videoDuration)
}
catch _
{
}
}
// Create main instruction for video composition
let main_instruction = AVMutableVideoCompositionInstruction()
main_instruction.timeRange = CMTimeRangeMake(kCMTimeZero, totalTime)
// Create array to hold instructions
var layer_instructions = [AVVideoCompositionLayerInstruction]()
// Create layer instruction
let layerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: track)
// Add it to the array
layer_instructions.append(layerInstruction)
...