Compression Properties
Properties that you use to configure a compression session.
Overview
Topics
Bitstream Configuration
kVTCompressionPropertyKey_DepthkVTCompressionPropertyKey_H264EntropyModekVTCompressionPropertyKey_HDRMetadataInsertionModekVTCompressionPropertyKey_OutputBitDepthkVTCompressionPropertyKey_PreserveAlphaChannelkVTCompressionPropertyKey_PreserveDynamicHDRMetadatakVTCompressionPropertyKey_ProfileLevel
Buffers
kVTCompressionPropertyKey_NumberOfPendingFrameskVTCompressionPropertyKey_PixelBufferPoolIsSharedkVTCompressionPropertyKey_VideoEncoderPixelBufferAttributes
Camera Calibration
kVTCompressionPropertyKey_CameraCalibrationDataLensCollectionkVTCompressionPropertyCameraCalibrationKey_ExtrinsicOrientationQuaternionkVTCompressionPropertyCameraCalibrationKey_ExtrinsicOriginSourcekVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrixkVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrixProjectionOffsetkVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrixReferenceDimensionskVTCompressionPropertyCameraCalibrationKey_LensAlgorithmKindkVTCompressionPropertyCameraCalibrationKey_LensDistortionskVTCompressionPropertyCameraCalibrationKey_LensDomainkVTCompressionPropertyCameraCalibrationKey_LensFrameAdjustmentsPolynomialXkVTCompressionPropertyCameraCalibrationKey_LensFrameAdjustmentsPolynomialYkVTCompressionPropertyCameraCalibrationKey_LensIdentifierkVTCompressionPropertyCameraCalibrationKey_LensRolekVTCompressionPropertyCameraCalibrationKey_RadialAngleLimit
Clean Aperture and Pixel Aspect Ratio
kVTCompressionPropertyKey_AspectRatio16x9kVTCompressionPropertyKey_CleanAperturekVTCompressionPropertyKey_FieldCountkVTCompressionPropertyKey_FieldDetailkVTCompressionPropertyKey_PixelAspectRatiokVTCompressionPropertyKey_ProgressiveScan
Color
kVTCompressionPropertyKey_AlphaChannelModekVTCompressionPropertyKey_ColorPrimarieskVTCompressionPropertyKey_ContentLightLevelInfokVTCompressionPropertyKey_GammaLevelkVTCompressionPropertyKey_ICCProfilekVTCompressionPropertyKey_MasteringDisplayColorVolumekVTCompressionPropertyKey_TransferFunctionkVTCompressionPropertyKey_YCbCrMatrix
Compression Presets
kVTCompressionPreset_BalancedkVTCompressionPreset_HighQualitykVTCompressionPreset_HighSpeedkVTCompressionPreset_VideoConferencingkVTCompressionPropertyKey_SupportedPresetDictionaries
Encoder Selection
kVTCompressionPropertyKey_EncoderIDkVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoderkVTVideoEncoderSpecification_EnableLowLatencyRateControlkVTVideoEncoderSpecification_EncoderIDkVTVideoEncoderSpecification_PreferredEncoderGPURegistryIDkVTVideoEncoderSpecification_RequiredEncoderGPURegistryIDkVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder
Encoding Hints
kVTCompressionPropertyKey_ExpectedDurationkVTCompressionPropertyKey_ExpectedFrameRatekVTCompressionPropertyKey_MaximumRealTimeFrameRatekVTCompressionPropertyKey_PrioritizeEncodingSpeedOverQualitykVTCompressionPropertyKey_ReferenceBufferCountkVTCompressionPropertyKey_SourceFrameCountkVTCompressionPropertyKey_SuggestedLookAheadFrameCount
Frame Dependency
kVTCompressionPropertyKey_AllowFrameReorderingkVTCompressionPropertyKey_AllowOpenGOPkVTCompressionPropertyKey_AllowTemporalCompressionkVTCompressionPropertyKey_MaxKeyFrameIntervalkVTCompressionPropertyKey_MaxKeyFrameIntervalDuration
Hardware Acceleration
kVTCompressionPropertyKey_UsingGPURegistryIDkVTCompressionPropertyKey_UsingHardwareAcceleratedVideoEncoder
Long-Term Reference
kVTCompressionPropertyKey_EnableLTRkVTEncodeFrameOptionKey_AcknowledgedLTRTokenskVTEncodeFrameOptionKey_ForceLTRRefreshkVTSampleAttachmentKey_RequireLTRAcknowledgementToken
Multipass Storage
Multiview Compression
kVTCompressionPropertyKey_MVHEVCLeftAndRightViewIDskVTCompressionPropertyKey_MVHEVCVideoLayerIDskVTCompressionPropertyKey_MVHEVCViewIDs
Parallelization
kVTCompressionPropertyKey_RecommendedParallelizationLimitkVTCompressionPropertyKey_RecommendedParallelizedSubdivisionMinimumDurationkVTCompressionPropertyKey_RecommendedParallelizedSubdivisionMinimumFrameCount
Per-Frame Configuration
Precompression Processing
Quality Metrics
kVTCompressionPropertyKey_CalculateMeanSquaredErrorkVTSampleAttachmentKey_QualityMetricskVTSampleAttachmentQualityMetricsKey_ChromaBlueMeanSquaredErrorkVTSampleAttachmentQualityMetricsKey_ChromaRedMeanSquaredErrorkVTSampleAttachmentQualityMetricsKey_LumaMeanSquaredError
Quantization
kVTCompressionPropertyKey_MaxAllowedFrameQPkVTCompressionPropertyKey_MinAllowedFrameQPkVTCompressionPropertyKey_SpatialAdaptiveQPLevelkVTCompressionPropertyKey_SupportsBaseFrameQP
Rate Control
kVTCompressionPropertyKey_AverageBitRatekVTCompressionPropertyKey_ConstantBitRatekVTCompressionPropertyKey_DataRateLimitskVTCompressionPropertyKey_EstimatedAverageBytesPerFramekVTCompressionPropertyKey_MoreFramesAfterEndkVTCompressionPropertyKey_MoreFramesBeforeStartkVTCompressionPropertyKey_QualitykVTCompressionPropertyKey_TargetQualityForAlphakVTCompressionPropertyKey_VariableBitRatekVTCompressionPropertyKey_VBVBufferDurationkVTCompressionPropertyKey_VBVInitialDelayPercentagekVTCompressionPropertyKey_VBVMaxBitRate
Runtime Restrictions
kVTCompressionPropertyKey_MaxFrameDelayCountkVTCompressionPropertyKey_MaxH264SliceByteskVTCompressionPropertyKey_MaximizePowerEfficiencykVTCompressionPropertyKey_RealTime
Temporal Scalability
kVTCompressionPropertyKey_BaseLayerBitRateFractionkVTCompressionPropertyKey_BaseLayerFrameRatekVTCompressionPropertyKey_BaseLayerFrameRateFraction
Video Extended Usage (VEXU) Signaling
kVTCompressionPropertyKey_HasLeftStereoEyeViewkVTCompressionPropertyKey_HasRightStereoEyeViewkVTCompressionPropertyKey_HeroEyekVTCompressionPropertyKey_HorizontalDisparityAdjustmentkVTCompressionPropertyKey_HorizontalFieldOfViewkVTCompressionPropertyKey_ProjectionKindkVTCompressionPropertyKey_StereoCameraBaselinekVTCompressionPropertyKey_ViewPackingKind