Kametrixom's copy CMSampleBuffer attempt.swift

guard let pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return }
			
var copiedPixelBuffer : CVPixelBuffer?
CVPixelBufferCreate(
	nil,
	CVPixelBufferGetWidth(pixelBuffer),
	CVPixelBufferGetHeight(pixelBuffer),
	CVPixelBufferGetPixelFormatType(pixelBuffer),
	nil,
	&copiedPixelBuffer)
CVBufferPropagateAttachments(pixelBuffer, copiedPixelBuffer!)

CVPixelBufferLockBaseAddress(pixelBuffer, kCVPixelBufferLock_ReadOnly)
CVPixelBufferLockBaseAddress(copiedPixelBuffer!, 0)

let size = CVPixelBufferGetDataSize(pixelBuffer)
print("\(size) \(CVPixelBufferGetBaseAddress(copiedPixelBuffer!)) \(CVPixelBufferGetBaseAddress(pixelBuffer))")
memcpy(
	CVPixelBufferGetBaseAddress(copiedPixelBuffer!),
	CVPixelBufferGetBaseAddress(pixelBuffer),
	size)

// Using this inlined code casues a segfault every time
	// while using the extracted local variable makes the call
	// succeed (though not sure if the memory is actually copied correctly.

// memcpy(
// 	CVPixelBufferGetBaseAddress(copiedPixelBuffer!),
// 	CVPixelBufferGetBaseAddress(pixelBuffer),
// 	CVPixelBufferGetDataSize(pixelBuffer))

CVPixelBufferUnlockBaseAddress(copiedPixelBuffer!, 0)
CVPixelBufferUnlockBaseAddress(pixelBuffer, kCVPixelBufferLock_ReadOnly)

let format = CMSampleBufferGetFormatDescription(sampleBuffer)!
var timing = CMSampleTimingInfo()
CMSampleBufferGetSampleTimingInfo(sampleBuffer, 0, &timing)

var copiedSampleBuffer : CMSampleBuffer?

// Note, both of these segfault and both set status to -12743
let status = CMSampleBufferCreateReadyWithImageBuffer(nil, copiedPixelBuffer!, format, &timing, &copiedSampleBuffer)
// let status = CMSampleBufferCreateForImageBuffer(nil, copiedPixelBuffer!, true, nil, nil, format, &timing, &copiedSampleBuffer)

// Code segfaults here too (probably actually happens with CMSampleBufferCreateReadyWithImageBuffer)
// Status does not print unless it is the first print statement, segfault happens on first statement after either CMSampleBufferCreate)
// Debugger shows that status = -12743, same as before :'(
print("Hello")
print("Hello \(status)")

print(status)