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我正在使用 AVAssetWriter 类从我的应用程序屏幕重新编码视频。视频记录。但重新编码的视频是蓝色的。我设置 AVAssetWriter 的代码如下

-(BOOL) setUpWriter {
    NSError* error = nil;
    videoWriter = [[AVAssetWriter alloc] initWithURL:[self tempFileURL] fileType:AVFileTypeAppleM4V error:&error];
    NSParameterAssert(videoWriter);

    //Configure video
    NSDictionary* videoCompressionProps = [NSDictionary dictionaryWithObjectsAndKeys:
                                           [NSNumber numberWithDouble:1024.0*1024.0], AVVideoAverageBitRateKey,
                                           nil ];

    CGSize size=[CCDirector sharedDirector].winSize;
    NSDictionary* videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                   AVVideoCodecH264, AVVideoCodecKey,
                                   [NSNumber numberWithInt:size.width], AVVideoWidthKey,
                                   [NSNumber numberWithInt:size.height], AVVideoHeightKey,
                                   videoCompressionProps, AVVideoCompressionPropertiesKey,
                                   nil];

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

    NSParameterAssert(videoWriterInput);
    videoWriterInput.expectsMediaDataInRealTime = YES;
    NSDictionary* bufferAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                      [NSNumber numberWithInt:kCVPixelFormatType_32ARGB], kCVPixelBufferPixelFormatTypeKey, nil];

    avAdaptor = [[AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput sourcePixelBufferAttributes:bufferAttributes] retain];

    //add input
    [videoWriter addInput:videoWriterInput];
    [videoWriter startWriting];
    [videoWriter startSessionAtSourceTime:CMTimeMake(0, 1000)];

    return YES;
}

我的代码中是否有任何错误。我怎么解决这个问题

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2 回答 2

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您的 AVAssetWriterInput 需要 ARGB，但您可能正在为它提供 RGBA。

这将看到可能的 100% alpha 被解释为蓝色并且红色分量被丢弃，这将解释你的蓝色色调。

如果没有看到您的屏幕录制代码，很难分辨。

于 2012-02-15T20:47:28.570 回答
3

可能问题是像素格式不正确，尝试使用 kCVPixelFormatType_32BGRA

于 2012-05-26T16:20:07.003 回答