Question

可能重复：
Merge Two Video files in iPhone Application

我已从多个分割（2mb）中的服务器下载40mb视频文件。我正在使用NSURLConnection我希望将20分割为单个视频文件。怎么做是有iphone框架中的任何API可以有人用代码解释我。这是我的connectionDidFinishLoading方法

 - (void)connectionDidFinishLoading:(NSURLConnection *)connection {

NSString *fileName = [NSString stringWithFormat:@"%@",
                                      filePath];
[contentData writeToFile:fileName atomically:YES];

}

如果我这样写，我只得到最后一个分割文件。我的意思是2mb数据只有一个指导我如何做到这一点？

Answer 1

我不确定writeToFile是否适用于这种情况，

但是要在附加模式下添加文件，请使用以下代码

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *documentTXTPath = [documentsDirectory stringByAppendingPathComponent:@"Notes.txt"];
NSString *savedString = textview.text;
NSFileHandle *myHandle = [NSFileHandle fileHandleForWritingAtPath:logPath];
[myHandle seekToEndOfFile];
[myHandle writeData:[savedString dataUsingEncoding:NSUTF8StringEncoding]];

删除代码，

[contentData writeToFile:fileName atomically:YES];

Answer 2

- (void) mergeVideos{
///... after getting hold or your assets....firstAsset, secondAsset

AVMutableComposition* mixComposition = [AVMutableComposition composition];

AVMutableCompositionTrack *firstTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo 
                                                                  preferredTracfirst:kCMPersistentTracfirst_Invalid];
[firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, firstAsset.duration) 
                    ofTrack:[[firstAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] 
                     atTime:kCMTimeZero error:nil];

AVMutableCompositionTrack *secondTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo 
                                                                   preferredTracfirst:kCMPersistentTracfirst_Invalid];

[secondTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, secondAsset.duration)
                     ofTrack:[[secondAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] 
                      atTime:kCMTimeZero error:nil];    

[secondTrack setPreferredTransform:CGAffineTransformMakeScale(0.25f,0.25f)]; 
}

如何逐个合并视频文件

2 个答案: