My app want Converting iphone12 HDR Video to SDR，to edit。 follow the doc Apple-HDR-Convert.
My code setting the pixBuffAttributes
[pixBuffAttributes setObject:(id)(kCVImageBufferYCbCrMatrix_ITU_R_709_2) forKey:(id)kCVImageBufferYCbCrMatrixKey];
[pixBuffAttributes setObject:(id)(kCVImageBufferColorPrimaries_ITU_R_709_2) forKey:(id)kCVImageBufferColorPrimariesKey];
[pixBuffAttributes setObject:(id)kCVImageBufferTransferFunction_ITU_R_709_2 forKey:(id)kCVImageBufferTransferFunctionKey];
playerItemOutput = [[AVPlayerItemVideoOutput alloc] initWithPixelBufferAttributes:pixBuffAttributes];
but I get the playerItemOutput's output buffer
CFTypeRef colorAttachments = CVBufferGetAttachment(pixelBuffer, kCVImageBufferYCbCrMatrixKey, NULL);
CFTypeRef colorPrimaries = CVBufferGetAttachment(pixelBuffer, kCVImageBufferColorPrimariesKey, NULL);
CFTypeRef colorTransFunc = CVBufferGetAttachment(pixelBuffer, kCVImageBufferTransferFunctionKey, NULL);
NSLog(@"colorAttachments = %@", colorAttachments);
NSLog(@"colorPrimaries = %@", colorPrimaries);
NSLog(@"colorTransFunc = %@", colorTransFunc);
log output:
colorAttachments = ITU_R_2020
colorPrimaries = ITU_R_2020
colorTransFunc = ITU_R_2100_HLG
pixBuffAttributes setting output format invalid，please help！
