从CVPixelBuffer创建CMSampleBuffer

Question

我提供了pixelbuffer，我需要从lf.swift库附加到rtmpStream对象以将其流式传输到youtube。它看起来像这样：rtmpStream.appendSampleBuffer(sampleBuffer: CMSampleBuffer, withType: CMSampleBufferType)

所以，我需要以某种方式将CVPixelbuffer转换为CMSampleBuffer以附加到rtmpStream。

var sampleBuffer: CMSampleBuffer? = nil
    var sampleTimingInfo: CMSampleTimingInfo = kCMTimingInfoInvalid
    sampleTimingInfo.presentationTimeStamp = presentationTime

    var formatDesc: CMVideoFormatDescription? = nil
    _ = CMVideoFormatDescriptionCreateForImageBuffer(kCFAllocatorDefault, pixelBuffer, &formatDesc)

    if let formatDesc = formatDesc {
        CMSampleBufferCreateReadyWithImageBuffer(kCFAllocatorDefault, pixelBuffer, formatDesc, &sampleTimingInfo, &sampleBuffer)
    }

    if let sampleBuffer = sampleBuffer {
        self.rtmpStream.appendSampleBuffer(sampleBuffer, withType: CMSampleBufferType.video)
    }

但遗憾的是，这不起作用。流媒体库经过测试，在我流式摄像机输入或screenCapture时工作正常。我认为问题可能是sampleTimingInfo，因为它需要decodeTime和Duration，我不知道如何获得提供的CVPixelBuffer。