IOS多张图片合成一个视频

 - (void)viewDidLoad
 {
    [superviewDidLoad];
     //Do any additional setup after loading the view.
    imageArr =[[NSMutableArrayalloc]initWithObjects:
              [UIImageimageNamed:@"1"],[UIImageimageNamed:@"2.jpg"],[UIImageimageNamed:@"3.jpg"],[UIImageimageNamed:@"4.jpg"],[UIImageimageNamed:@"5.jpg"],[UIImageimageNamed:@"6.jpg"],[UIImageimageNamed:@"7.jpg"],[UIImageimageNamed:@"8.jpg"],[UIImageimageNamed:@"9.jpg"],[UIImageimageNamed:@"10.jpg"],[UIImageimageNamed:@"11.jpg"],[UIImageimageNamed:@"12.jpg"],[UIImageimageNamed:@"13.jpg"],[UIImageimageNamed:@"14.jpg"],[UIImageimageNamed:@"15"],[UIImageimageNamed:@"16"],[UIImageimageNamed:@"17"],[UIImageimageNamed:@"18"],[UIImageimageNamed:@"19"],[UIImageimageNamed:@"20"],[UIImageimageNamed:@"21"],[UIImageimageNamed:@"22"],[UIImageimageNamed:@"23"],[UIImageimageNamed:@"24"],[UIImageimageNamed:@"25"],[UIImageimageNamed:@"26"],[UIImageimageNamed:@"27"],[UIImageimageNamed:@"28"],[UIImageimageNamed:@"29"],[UIImageimageNamed:@"30"],[UIImageimageNamed:@"31"],nil];

    UIButton * button =[UIButtonbuttonWithType:UIButtonTypeRoundedRect];
     [buttonsetFrame:CGRectMake(100,100, 100,100)];
    [buttonsetTitle:@"合成"forState:UIControlStateNormal];
    [buttonaddTarget:selfaction:@selector(testCompressionSession)forControlEvents:UIControlEventTouchUpInside];
    [self.viewaddSubview:button];

    UIButton * button1 =[UIButtonbuttonWithType:UIButtonTypeRoundedRect];
     [button1setFrame:CGRectMake(100,200, 100,100)];
    [button1setTitle:@"播放"forState:UIControlStateNormal];
    [button1addTarget:selfaction:@selector(playAction)forControlEvents:UIControlEventTouchUpInside];
    [self.viewaddSubview:button1];
 }

 -(void)testCompressionSession
 {
    NSLog(@"开始");
    //NSString *moviePath = [[NSBundle mainBundle]pathForResource:@"Movie" ofType:@"mov"];
    NSArray *paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    NSString *moviePath =[[pathsobjectAtIndex:0]stringByAppendingPathComponent:[NSStringstringWithFormat:@"%@.mov",@"test"]];
    self.theVideoPath=moviePath;
    CGSize size =CGSizeMake(320,400);//定义视频的大小

 //    [selfwriteImages:imageArr ToMovieAtPath:moviePath withSize:sizeinDuration:4 byFPS:30];//第2中方法

    NSError *error =nil;

    unlink([moviePathUTF8String]);
    NSLog(@"path->%@",moviePath);
    //—-initialize compression engine
    AVAssetWriter *videoWriter =[[AVAssetWriteralloc]initWithURL:[NSURLfileURLWithPath:moviePath]
                                                  fileType:AVFileTypeQuickTimeMovie
                                                    error:&error];
    NSParameterAssert(videoWriter);
    if(error)
       NSLog(@"error =%@", [errorlocalizedDescription]);

    NSDictionary *videoSettings =[NSDictionarydictionaryWithObjectsAndKeys:AVVideoCodecH264,AVVideoCodecKey,
                              [NSNumbernumberWithInt:size.width],AVVideoWidthKey,
                              [NSNumbernumberWithInt:size.height],AVVideoHeightKey,nil];
    AVAssetWriterInput *writerInput =[AVAssetWriterInputassetWriterInputWithMediaType:AVMediaTypeVideooutputSettings:videoSettings];

    NSDictionary*sourcePixelBufferAttributesDictionary =[NSDictionarydictionaryWithObjectsAndKeys:[NSNumbernumberWithInt:kCVPixelFormatType_32ARGB],kCVPixelBufferPixelFormatTypeKey,nil];

    AVAssetWriterInputPixelBufferAdaptor *adaptor =[AVAssetWriterInputPixelBufferAdaptor
                                             assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInputsourcePixelBufferAttributes:sourcePixelBufferAttributesDictionary];
    NSParameterAssert(writerInput);
    NSParameterAssert([videoWritercanAddInput:writerInput]);

    if ([videoWritercanAddInput:writerInput])
       NSLog(@"11111");
    else
       NSLog(@"22222");

     [videoWriteraddInput:writerInput];

     [videoWriterstartWriting];
    [videoWriterstartSessionAtSourceTime:kCMTimeZero];

    //合成多张图片为一个视频文件
    dispatch_queue_t dispatchQueue =dispatch_queue_create("mediaInputQueue",NULL);
    int __block frame =0;

    [writerInputrequestMediaDataWhenReadyOnQueue:dispatchQueueusingBlock:^{
        while([writerInputisReadyForMoreMediaData])
        {
           if(++frame >=[imageArrcount]*10)
            {
               [writerInputmarkAsFinished];
               [videoWriterfinishWriting];
 //              [videoWriterfinishWritingWithCompletionHandler:nil];
              break;
            }

           CVPixelBufferRef buffer =NULL;

           int idx =frame/10;
           NSLog(@"idx==%d",idx);

            buffer =(CVPixelBufferRef)[selfpixelBufferFromCGImage:[[imageArrobjectAtIndex:idx]CGImage]size:size];

           if (buffer)
            {
              if(![adaptorappendPixelBuffer:bufferwithPresentationTime:CMTimeMake(frame,10)])
                 NSLog(@"FAIL");
              else
                 NSLog(@"OK");
                 CFRelease(buffer);
            }
        }
     }];
 }

 - (CVPixelBufferRef)pixelBufferFromCGImage:(CGImageRef)imagesize:(CGSize)size
 {
    NSDictionary *options =[NSDictionarydictionaryWithObjectsAndKeys:
                         [NSNumbernumberWithBool:YES],kCVPixelBufferCGImageCompatibilityKey,
                         [NSNumbernumberWithBool:YES],kCVPixelBufferCGBitmapContextCompatibilityKey,nil];
    CVPixelBufferRef pxbuffer =NULL;
    CVReturn status =CVPixelBufferCreate(kCFAllocatorDefault,size.width,size.height,kCVPixelFormatType_32ARGB,(__bridgeCFDictionaryRef) options,&pxbuffer);

    NSParameterAssert(status ==kCVReturnSuccess && pxbuffer !=NULL);

    CVPixelBufferLockBaseAddress(pxbuffer,0);
    voidvoid *pxdata =CVPixelBufferGetBaseAddress(pxbuffer);
    NSParameterAssert(pxdata !=NULL);

    CGColorSpaceRef rgbColorSpace=CGColorSpaceCreateDeviceRGB();
    CGContextRef context =CGBitmapContextCreate(pxdata,size.width,size.height,8,4*size.width,rgbColorSpace,kCGImageAlphaPremultipliedFirst);
    NSParameterAssert(context);

    CGContextDrawImage(context,CGRectMake(0,0,CGImageGetWidth(image),CGImageGetHeight(image)), image);

    CGColorSpaceRelease(rgbColorSpace);
    CGContextRelease(context);

    CVPixelBufferUnlockBaseAddress(pxbuffer,0);

    return pxbuffer;
 }

 -(void)playAction
 {
    MPMoviePlayerViewController *theMovie =[[MPMoviePlayerViewControlleralloc]initWithContentURL:[NSURLfileURLWithPath:self.theVideoPath]];
    [selfpresentMoviePlayerViewControllerAnimated:theMovie];
    theMovie.moviePlayer.movieSourceType=MPMovieSourceTypeFile;
    [theMovie.moviePlayerplay];
 }


 //第二种方式
 - (void)writeImages:(NSArray *)imagesArrayToMovieAtPath:(NSString *) pathwithSize:(CGSize) size
         inDuration:(float)durationbyFPS:(int32_t)fps{
    //Wire the writer:
    NSError *error =nil;
    AVAssetWriter *videoWriter =[[AVAssetWriteralloc]initWithURL:[NSURLfileURLWithPath:path]
                                                   fileType:AVFileTypeQuickTimeMovie
                                                     error:&error];
    NSParameterAssert(videoWriter);

    NSDictionary *videoSettings =[NSDictionarydictionaryWithObjectsAndKeys:
                              AVVideoCodecH264,AVVideoCodecKey,
                              [NSNumbernumberWithInt:size.width],AVVideoWidthKey,
                              [NSNumbernumberWithInt:size.height],AVVideoHeightKey,
                              nil nil];

    AVAssetWriterInput* videoWriterInput =[AVAssetWriterInput
                                      assetWriterInputWithMediaType:AVMediaTypeVideo
                                      outputSettings:videoSettings];


    AVAssetWriterInputPixelBufferAdaptor *adaptor =[AVAssetWriterInputPixelBufferAdaptor
                                             assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput
                                             sourcePixelBufferAttributes:nil];
    NSParameterAssert(videoWriterInput);
    NSParameterAssert([videoWritercanAddInput:videoWriterInput]);
     [videoWriteraddInput:videoWriterInput];

    //Start a session:
     [videoWriterstartWriting];
    [videoWriterstartSessionAtSourceTime:kCMTimeZero];

    //Write some samples:
    CVPixelBufferRef buffer =NULL;

    int frameCount =0;

    int imagesCount = [imagesArraycount];
    float averageTime =duration/imagesCount;
    int averageFrame =(int)(averageTime * fps);

    for(UIImage *img in imagesArray)
     {
        buffer=[selfpixelBufferFromCGImage:[imgCGImage]size:size];
        BOOL append_ok =NO;
        int j =0;
        while (!append_ok&& j <</b> 30)
        {
           if(adaptor.assetWriterInput.readyForMoreMediaData)
            {
              printf("appending %d attemp%d\n", frameCount, j);

              CMTime frameTime =CMTimeMake(frameCount,(int32_t)fps);
               floatframeSeconds =CMTimeGetSeconds(frameTime);
              NSLog(@"frameCount:%d,kRecordingFPS:%d,frameSeconds:%f",frameCount,fps,frameSeconds);
               append_ok = [adaptorappendPixelBuffer:bufferwithPresentationTime:frameTime];

              if(buffer)
                  [NSThreadsleepForTimeInterval:0.05];
            }
           else
            {
              printf("adaptor not ready %d,%d\n", frameCount, j);
              [NSThreadsleepForTimeInterval:0.1];
            }
           j++;
        }
        if (!append_ok){
          printf("error appendingimage %d times %d\n", frameCount, j);
        }

        frameCount = frameCount + averageFrame;
     }

    //Finish the session:
     [videoWriterInputmarkAsFinished];
     [videoWriterfinishWriting];
    NSLog(@"finishWriting");
 }

 <span style="font-size:18px;color:#ff6600;">推荐一个别人写好的<a target=_blank href="https://github.com/HarrisonJackson/HJImagesToVideo">https://github.com/HarrisonJackson/HJImagesToVideo</a></span>