Explore low-latency video encoding with VideoToolbox

5:03 - VTCompressionSession creation

CFMutableDictionaryRef encoderSpecification =
            CFDictionaryCreateMutable(kCFAllocatorDefault, 0, NULL, NULL);

CFDictionarySetValue(encoderSpecification,
                     kVTVideoEncoderSpecification_EnableLowLatencyRateControl,
                     kCFBooleanTrue)

VTCompressionSessionRef compressionSession;

OSStatus err = VTCompressionSessionCreate(kCFAllocatorDefault, 
                                          width, 
                                          height,
                                          kCMVideoCodecType_H264, 
                                          encoderSpecification,
                                          NULL, 
                                          NULL, 
                                          outputHandler, 
                                          NULL,
                                          &compressionSession);

7:35 - New profiles

// Request CBP

VTSessionSetProperty(compressionSession, 
                     kVTCompressionPropertyKey_ProfileLevel, 
                     kVTProfileLevel_H264_ConstrainedBaseline_AutoLevel);

// Request CHP

VTSessionSetProperty(compressionSession, 
                     kVTCompressionPropertyKey_ProfileLevel, 
                     kVTProfileLevel_H264_ConstrainedHigh_AutoLevel);