VideoToolBox 编码图像显示在 Yosemite OSX 中闪烁

Question

我使用了videoToolBox来编码和解码数据，所以一旦我们直接获得解码数据，我们就会传递给 AVSampleBufferDisplayLayer

这是代码片段

 -(CVPixelBufferRef)decode:(AVPacket*)vp {

    CVPixelBufferRef outputPixelBuffer = NULL;

    CMBlockBufferRef blockBuffer = NULL;
    OSStatus status  = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault,
                                                          (void*)vp->data, vp->size,
                                                          kCFAllocatorNull,
                                                          NULL, 0, vp->size,
                                                          0, &blockBuffer);


    //NSLog(@"status is for CMBlockBufferCreateWithMemoryBlock is %d",(int)status);
    if(status == kCMBlockBufferNoErr) {
        CMSampleBufferRef sampleBuffer = NULL;
        const size_t sampleSizeArray[] = {vp->size};
        status = CMSampleBufferCreateReady(kCFAllocatorDefault,
                                           blockBuffer,
                                           formatDesc ,
                                           1, 0, NULL, 1, sampleSizeArray,
                                           &sampleBuffer);
       // NSLog(@"status is for formatdesc is %d",(int)status);
        if (status == kCMBlockBufferNoErr && sampleBuffer) {
            CFArrayRef attachments = CMSampleBufferGetSampleAttachmentsArray(sampleBuffer, YES);
            CFMutableDictionaryRef dict = (CFMutableDictionaryRef)CFArrayGetValueAtIndex(attachments, 0);
            CFDictionarySetValue(dict, kCMSampleAttachmentKey_DisplayImmediately, kCFBooleanTrue);
            [displayLayer flush];
            if([displayLayer isReadyForMoreMediaData])
            {
                [displayLayer enqueueSampleBuffer:sampleBuffer];
            }

            [displayLayer setNeedsDisplay];

            [self performSelectorOnMainThread:@selector(setView:) withObject:[[RPCViewerAppInitializer sharedRPCViewerAppInitializer] rpcView] waitUntilDone:NO];
            CFRelease(blockBuffer);
            CFRelease(sampleBuffer);

        }
    }
    return outputPixelBuffer;
}

以上代码在 10.10 中运行良好 osx 但在 10.10 中我的屏幕出现闪烁。

任何帮助都将不胜感激。

Answer 1

这个问题已经解决：

我将 AVSampleBufferDisplayLayer 的 controlTimebase 属性设置为 nil，这是原因，现在我根本不设置这个属性

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