User Profile

I am currently working with AVAssetWriterInput with interlaced source.I want to know the proper procedure to preserve 'fiel' format description extension through AVAssetWriterInput compression operation.Do you anyone have an answer on this?>>Technical Note TN2162>>Uncompressed Y´CbCr Video in QuickTime Files>>The 'fiel' ImageDescription Extension: Field/Frame Information//What I have tried is following:First decode into sample buffer with Field/Frame information- Decode DV-NTSC source and get current FieldCount/Detail of source data- Create a kCVPixelFormatType_422YpCbCr8 CVImageBuffer from source- CMSetAttachments() kCVImageBufferFieldCountKey/kCVImageBufferFieldDetailKey with FieldCount=2/FieldDetail=14 to imageBuffer, same as DV-NTSC source- CMVideoFormatDescriptionCreateForImageBuffer()- CMSampleBufferCreateForImageBuffer()- Now decompressed samplebuffer has kCMFormatDescriptionExtension_FieldXXX same as sourceSecond encode using ProRes422- Next I create AVAssetWriterInput to transcode from _422YpCbCr8 into AVVideoCodecAppleProRes422- Now AVAssetWriter can produce ProRes422 mov file, but it does not contain the format description extension 'fiel'.- ProRes422 Encoder does preserve 'colr', 'pasp', 'clap' same as source, but no 'fiel' is there.I have also tried to serve format description with kCMFormatDescriptionExtension_FieldXXX with initWithMediaType:outputSettings:sourceFormatHint:but no success.//

I am trying to rewrite old FireWire CamCorder controll command line utilities into XPC Service.Old utility was modified version of simpleAVCSample.c in legacy sample codeAnd existing command binary works on macOS 10.14I tried same IOKit/IOCFPlugIn code in Application or XPCServiceBut they failed at following step kern_return_t result = IOCreatePlugInInterfaceForService( service, kIOFireWireAVCLibUnitTypeID, kIOCFPlugInInterfaceID, &interface,&score); // 0xe00002be = kIOReturnNoResources in IOReturn.hAnd always console.app logged sandboxd rejected as: Sandbox: testAVC(8332) System Policy: deny(1) iokit-open IOFireWireAVCUserClient Violation: System Policy: deny(1) iokit-open IOFireWireAVCUserClientBut this is always logged even if I DO NOT check sandbox entitlement.I also tried "com.apple.security.device.firewire" entitlement, because /System/Library/Sandbox/Profiles/Application.sb contains following part as:(when (entitlement "com.apple.security.device.firewire") (allow iokit-open (iokit-user-client-class "IOFireWireUserClient")) (allow iokit-open (iokit-user-client-class "IOFireWireAVCUserClient")) (allow iokit-open (iokit-user-client-class "IOFireWireAVCProtocolUserClient")) (allow iokit-set-properties (iokit-property "SummonNub")))But it also does not help.Please give me some hint how to resolve IOCreatePlugInInterfaceForService() error.