如何在iOS中使用AVAsset合并多个video？

我想将多个video合并为一个。

但我不知道如何做到这一点，请帮助我解决这个问题。

下面是我的代码，但它不适合我。

AVMutableComposition* mixComposition = [AVMutableComposition composition]; AVMutableCompositionTrack *compositionCommentaryTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; [compositionCommentaryTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset.duration) ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:kCMTimeZero error:nil]; AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; [compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil]; AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality]; NSString* videoName = @"export.mov"; NSString *exportPath = [NSTemporaryDirectory() stringByAppendingPathComponent:videoName]; NSURL *exportUrl = [NSURL fileURLWithPath:exportPath]; if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath]) { [[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil]; } _assetExport.outputFileType = @"com.apple.quicktime-movie"; _assetExport.outputURL = exportUrl; _assetExport.shouldOptimizeForNetworkUse = YES; [_assetExport exportAsynchronouslyWithCompletionHandler: ^(void ) { // your completion code here }]; 

我已经寻找这个，但没有答案为我工作。

Answer 1

检查我的代码下面这个工程正确…

 -(void)MergeVideo { AppDelegate *appdel = (AppDelegate*)[[UIApplication sharedApplication] delegate]; NSLog(@"Array Video Paths :- %@",appdel.arrVideoPath); CGFloat totalDuration; totalDuration = 0; AVMutableComposition *mixComposition = [[AVMutableComposition alloc] init]; AVMutableCompositionTrack *videoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; AVMutableCompositionTrack *audioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; CMTime insertTime = kCMTimeZero; for (id object in appdel.arrVideoPath) { AVAsset *asset = [AVAsset assetWithURL:[NSURL fileURLWithPath:object]]; CMTimeRange timeRange = CMTimeRangeMake(kCMTimeZero, asset.duration); [videoTrack insertTimeRange:timeRange ofTrack:[[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:insertTime error:nil]; [audioTrack insertTimeRange:timeRange ofTrack:[[asset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:insertTime error:nil]; insertTime = CMTimeAdd(insertTime,asset.duration); } NSString* documentsDirectory= [self applicationDocumentsDirectory]; myDocumentPath= [documentsDirectory stringByAppendingPathComponent:@"merge_video.mp4"]; urlVideoMain = [[NSURL alloc] initFileURLWithPath: myDocumentPath]; if([[NSFileManager defaultManager] fileExistsAtPath:myDocumentPath]) { [[NSFileManager defaultManager] removeItemAtPath:myDocumentPath error:nil]; } AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality]; exporter.outputURL = urlVideoMain; exporter.outputFileType = @"com.apple.quicktime-movie"; exporter.shouldOptimizeForNetworkUse = YES; [exporter exportAsynchronouslyWithCompletionHandler:^{ switch ([exporter status]) { case AVAssetExportSessionStatusFailed: break; case AVAssetExportSessionStatusCancelled: break; case AVAssetExportSessionStatusCompleted: break; default: break; } }]; } - (NSString*) applicationDocumentsDirectory { NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString* basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; return basePath; } 

Answer 2

 { AVURLAsset *video01; AVURLAsset *video02; CGFloat totalDuration; totalDuration = 0; //initialization, keep it 0 AVMutableComposition *composition = [AVMutableComposition composition]; AVMutableCompositionTrack *composedTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; for (int i = 0; i < [arrVideoPath count]; i++) //arrVideoPath contains all video paths { if (i == 0) { video02 = [[AVURLAsset alloc] initWithURL:[NSURL fileURLWithPath:[arrVideoPath objectAtIndex:i]] options:nil]; [composedTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, video02.duration) ofTrack:[[video02 tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil]; } else { video01 = [[AVURLAsset alloc] initWithURL:[NSURL fileURLWithPath:[arrVideoPath objectAtIndex:i-1]] options:nil]; video02 = [[AVURLAsset alloc] initWithURL:[NSURL fileURLWithPath:[arrVideoPath objectAtIndex:i]] options:nil]; float duration1 = CMTimeGetSeconds([video01 duration]); totalDuration = totalDuration + duration1; CMTime time1 = CMTimeMakeWithSeconds(totalDuration, 1); [composedTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, video02.duration) ofTrack:[[video02 tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:time1 error:nil]; } NSString* documentsDirectory= [self applicationDocumentsDirectory]; myDocumentPath= [documentsDirectory stringByAppendingPathComponent:@"merge_video.mp4"]; //myDocumentPath is NSString that gives path of output video(combined video) urlVideoMain = [[NSURL alloc] initFileURLWithPath: myDocumentPath]; //urlVideoMain is Url of output video. if([[NSFileManager defaultManager] fileExistsAtPath:myDocumentPath]) { [[NSFileManager defaultManager] removeItemAtPath:myDocumentPath error:nil]; } //removes previous video at same path, essential AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:composition presetName:AVAssetExportPresetHighestQuality]; exporter.outputURL = urlVideoMain; exporter.outputFileType = @"com.apple.quicktime-movie"; exporter.shouldOptimizeForNetworkUse = YES; [exporter exportAsynchronouslyWithCompletionHandler:^{ switch ([exporter status]) { case AVAssetExportSessionStatusFailed: break; case AVAssetExportSessionStatusCancelled: break; case AVAssetExportSessionStatusCompleted: break; default: break; } }]; } -(NSString*) applicationDocumentsDirectory { NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString* basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; return basePath; }