I'm working on a MV-HEVC transcoder, based on the VTEncoderForTranscoding sample code.
In swift the following code snippet generates a linker error on macOS 14.0 and 14.1.
let err = VTCompressionSessionEncodeMultiImageFrame(compressionSession, taggedBuffers: taggedBuffers, presentationTimeStamp: pts, duration: .invalid, frameProperties: nil, infoFlagsOut: nil) {
(status: OSStatus, infoFlags: VTEncodeInfoFlags, sbuf: CMSampleBuffer?) -> Void in
outputHandler(status, infoFlags, sbuf, thisFrameNumber)
}
Error:
ld: Undefined symbols:
VideoToolbox.VTCompressionSessionEncodeMultiImageFrame(_: __C.VTCompressionSessionRef, taggedBuffers: [CoreMedia.CMTaggedBuffer], presentationTimeStamp: __C.CMTime, duration: __C.CMTime, frameProperties: __C.CFDictionaryRef?, infoFlagsOut: Swift.UnsafeMutablePointer<__C.VTEncodeInfoFlags>?, outputHandler: (Swift.Int32, __C.VTEncodeInfoFlags, __C.CMSampleBufferRef?) -> ()) -> Swift.Int32, referenced from:
(3) suspend resume partial function for VTEncoderForTranscoding_Swift.(compressFrames in _FE7277D5F28D8DABDFC10EA0164D825D)(from: VTEncoderForTranscoding_Swift.VideoSource, options: VTEncoderForTranscoding_Swift.Options, expectedFrameRate: Swift.Float, outputHandler: @Sendable (Swift.Int32, __C.VTEncodeInfoFlags, __C.CMSampleBufferRef?, Swift.Int) -> ()) async throws -> () in VTEncoderForTranscoding.o
Using VTCompressionSessionEncodeMultiImageFrameWithOutputHandler in ObjC doesn't trigger a linker error.
Anybody knows how to get it to work in Swift?
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