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我有一堆视频文件要合并到一个视频文件中，我正在使用 NSMutableData 来完成任务

NSMutableData *concatenatedData = [[NSMutableData alloc] init];
for (int i=0; i <[videoArray count]; i ++) {
  [concatenatedData appendData: [videoArray objectAtIndex:i]];
}
[concatenatedData writeToFile:[[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"outputConct.mov"] atomically:YES];
UISaveVideoAtPathToSavedPhotosAlbum([[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(),@"outputConct.mov"], nil, nil, nil);

将视频保存在我的相机胶卷中后，我尝试播放它，但其中只有第一个 NSData 视频。我不确定为什么。

编辑

我尝试了 AVMutableComposition，即使那样我也遇到了同样的问题

AVMutableComposition* mixComposition = [[AVMutableComposition alloc] init];
        AVURLAsset* firstAsset;
        AVMutableCompositionTrack *firstTrack;
        CMTime time = kCMTimeZero;
        for (int i=0; i<[videoArray count]; i++) {
            firstAsset = [[AVURLAsset alloc]initWithURL:[NSURL fileURLWithPath:[[NSString alloc] initWithFormat:@"%@%d%@", NSTemporaryDirectory(),i, @"output.mov"]] options:nil];
            firstTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
            [firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, firstAsset.duration) ofTrack:[[firstAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:time error:nil];
            time = firstAsset.duration;
        }

        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString *myPathDocs =  [documentsDirectory stringByAppendingPathComponent:
                                 [NSString stringWithFormat:@"mergeVideo-%d.mov",arc4random() % 1000]];
        NSURL *url = [NSURL fileURLWithPath:myPathDocs];
        // 5 - Create exporter
        AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition
                                                                          presetName:AVAssetExportPresetHighestQuality];
        exporter.outputURL=url;
        exporter.outputFileType = AVFileTypeQuickTimeMovie;
        exporter.shouldOptimizeForNetworkUse = YES;
        [exporter exportAsynchronouslyWithCompletionHandler:^{
            dispatch_async(dispatch_get_main_queue(), ^{
                if (exporter.status == AVAssetExportSessionStatusCompleted) {
                    //NSURL *outputURL = exporter.outputURL;
                    UISaveVideoAtPathToSavedPhotosAlbum(myPathDocs, nil, nil, nil);
                }
            });
        }];

编辑

我也试过这个，但它给了我一个错误，它说[__NSArrayM insertObject:atIndex:]: object cannot be nil'

AVMutableComposition *mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
NSError * error = nil;
NSMutableArray * timeRanges = [NSMutableArray arrayWithCapacity:[videoArray count]];
NSMutableArray * tracks = [NSMutableArray arrayWithCapacity:[videoArray count]];
for (int i=0; i<[videoArray count]; i++) {
    AVURLAsset *assetClip = [[AVURLAsset alloc]initWithURL:[NSURL fileURLWithPath:[[NSString alloc] initWithFormat:@"%@%d%@", NSTemporaryDirectory(),i, @"output.mov"]] options:nil];
    AVAssetTrack *clipVideoTrackB = [[assetClip tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];

    [timeRanges addObject:[NSValue valueWithCMTimeRange:CMTimeRangeMake(kCMTimeZero, assetClip.duration)]];
    [tracks addObject:clipVideoTrackB];
}
[compositionTrack insertTimeRanges:timeRanges ofTracks:tracks atTime:kCMTimeZero error:&error];

这是程序崩溃的行。

[compositionTrack insertTimeRanges:timeRanges ofTracks:tracks atTime:kCMTimeZero error:&error];

我不确定为什么 timeRanges 和 track 都有值

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1 回答 1

2

AVFoundation您可以合并多个视频并通过使用classes- AVURLAsset、AVMutableComposition等一个接一个地附加来创建单个视频AVMutableCompositionTrack。

您可以检查此将多个视频文件附加/合并到一个最终输出视频中

还有一个很好的教程 1.教程 1 2.教程 2

希望它可以帮助你。

于 2013-05-05T08:16:01.017 回答