3

我使用下面的代码将图像写入视频

-(void) writeImagesToMovieAtPath:(NSString *) path withSize:(CGSize) size
{
    NSLog(@"Write Started");

    NSError *error = nil;

    AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
                                  [NSURL fileURLWithPath:path] fileType:AVFileTypeMPEG4
                                                              error:&error];
    NSParameterAssert(videoWriter);

    NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                   AVVideoCodecH264, AVVideoCodecKey,
                                   [NSNumber numberWithInt:size.width], AVVideoWidthKey,
                                   [NSNumber numberWithInt:size.height], AVVideoHeightKey,
                                   nil];

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


    AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
                                                     assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput
                                                     sourcePixelBufferAttributes:nil];

    NSParameterAssert(videoWriterInput);
    NSParameterAssert([videoWriter canAddInput:videoWriterInput]);
    videoWriterInput.expectsMediaDataInRealTime = YES;
    [videoWriter addInput:videoWriterInput];

    //Start a session:
    [videoWriter startWriting];
    [videoWriter startSessionAtSourceTime:kCMTimeZero];

    CVPixelBufferRef buffer = NULL;

    //convert uiimage to CGImage.

    int frameCount = 16;
    int kRecordingFPS = 30;
    UIImage * im = [UIImage imageNamed:@"IMG_0103.JPG"];

    NSArray * imageArray = [[NSArray alloc]initWithObjects:im,im,im,im,im,im,im,im,im,im,im,im,im,im,im,im, nil];

    for(UIImage * img in imageArray)
    {
        buffer = [self pixelBufferFromCGImage:[img CGImage] andSize:size];

        BOOL append_ok = NO;
        int j = 0;
        while (!append_ok && j < 30)
        {
            if (adaptor.assetWriterInput.readyForMoreMediaData)
            {
                printf("appending %d attemp %d\n", frameCount, j);

                CMTime frameTime = CMTimeMake(frameCount,(int32_t) kRecordingFPS);
                append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];

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


    //Finish the session:
    [videoWriterInput markAsFinished];
    [videoWriter finishWriting];
    NSLog(@"Write Ended");
    [videoWriterInput release];
    [videoWriter release];
    [imageArray release];
}

它第一次工作，但如果我运行代码 2,3 次或更多，它报告：

！appending 0 0-0 attemp 0
！appending 0 0-0 attemp 1
My App(11385,0xb0103000) malloc: *** error for object 0x9ab4270: double free
*** set a breakpoint in malloc_error_break to debug
！appending 0 0-0 attemp 2
My App(11385,0xb0103000) malloc: *** error for object 0x9ab4270: double free
*** set a breakpoint in malloc_error_break to debug
！appending 0 0-0 attemp 3

有时它会导致崩溃

我试图找到原因但没有结果，

欢迎您的评论

4

2 回答 2

10

而不是使用 [NSThread sleepForTimeInterval:0.1]; 使用 while(!adaptor.assetWriterInput.readyForMoreMediaData) {}

因为很多时候readyForMoreMediaData在 0.1 的时间间隔内从不设置为 YES。

也尝试释放appendPixelBuffer:withPresentationTime:方法占用的内存实际上这个方法阻止你成功运行

于 2012-11-23T05:44:51.847 回答
1

您需要使用 CFRelease() 释放缓冲区，如创建规则中所述 

if ([assetWriterInput isReadyForMoreMediaData]) {
    CVPixelBufferRef pixelBuffer = [self newPixelBufferFromCGImage:image.CGImage];
    CMTime frameTime = CMTimeMake(frameCount,(int32_t) kRecordingFPS);
    if (![adaptor appendPixelBuffer:pixelBuffer withPresentationTime:frameTime]) {
        NSError *error = [videoWriter error];
        NSLog(@"failed to append sbuf: %@", error);
    }
    CFRelease(pixelBuffer);
}
于 2013-11-30T22:51:59.287 回答