ios 視頻拼接/合成

標籤：

上面的圖說明的是這個混合的過程，下面放代碼：

- (void)mergeAndExportVideos:(NSArray*)videosPathArray withOutPath:(NSString*)outpath{    if (videosPathArray.count == 0) {        return;    }    AVMutableComposition *mixComposition = [[AVMutableComposition alloc] init];        AVMutableCompositionTrack *audioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio                    preferredTrackID:kCMPersistentTrackID_Invalid];    AVMutableCompositionTrack *videoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo                    preferredTrackID:kCMPersistentTrackID_Invalid];    CMTime totalDuration = kCMTimeZero;    for (int i = 0; i < videosPathArray.count; i++) {        AVURLAsset *asset = [AVURLAsset assetWithURL:[NSURL fileURLWithPath:videosPathArray[i]]];        NSError *erroraudio = nil;
　　　　　//擷取AVAsset中的音頻 或者視頻        AVAssetTrack *assetAudioTrack = [[asset tracksWithMediaType:AVMediaTypeAudio] firstObject];
　　　　　//向通道內加入音頻或者視頻        BOOL ba = [audioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset.duration)                            ofTrack:assetAudioTrack                             atTime:totalDuration                              error:&erroraudio];                NSLog(@"erroraudio:%@%d",erroraudio,ba);        NSError *errorVideo = nil;        AVAssetTrack *assetVideoTrack = [[asset tracksWithMediaType:AVMediaTypeVideo]firstObject];       BOOL bl = [videoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset.duration)                            ofTrack:assetVideoTrack                             atTime:totalDuration                              error:&errorVideo];                NSLog(@"errorVideo:%@%d",errorVideo,bl);        totalDuration = CMTimeAdd(totalDuration, asset.duration);    }    NSLog(@"%@",NSHomeDirectory());            NSURL *mergeFileURL = [NSURL fileURLWithPath:outpath];    AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition                                                                      presetName:AVAssetExportPreset640x480];    exporter.outputURL = mergeFileURL;    exporter.outputFileType = AVFileTypeMPEG4;    exporter.shouldOptimizeForNetworkUse = YES;    [exporter exportAsynchronouslyWithCompletionHandler:^{        NSLog(@"exporter%@",exporter.error);    }];

下面是方法詳解：

- (AVMutableCompositionTrack *)addMutableTrackWithMediaType:(NSString *)mediaType preferredTrackID:(CMPersistentTrackID)preferredTrackID;

參數：

mediaType          ：資料類型  AVMediaTypeVideo 視頻   AVMediaTypeAudio  音頻

preferredTrackID ：可自由設定 但建議kCMPersistentTrackID_Invalid也就是0

//向通道內加入音頻或者視頻- (BOOL)insertTimeRange:(CMTimeRange)timeRange ofTrack:(AVAssetTrack *)track atTime:(CMTime)startTime error:(NSError * __nullable * __nullable)outError;

參數：

timeRange:  插入視頻/音訊的時間段

track        ：插入的視頻/音頻

ios 視頻拼接/合成