H264Settings class

H264 Settings

Constructors

H264Settings({H264AdaptiveQuantization? adaptiveQuantization, AfdSignaling? afdSignaling, int? bitrate, int? bufFillPct, int? bufSize, H264ColorMetadata? colorMetadata, H264ColorSpaceSettings? colorSpaceSettings, H264EntropyEncoding? entropyEncoding, H264FilterSettings? filterSettings, FixedAfd? fixedAfd, H264FlickerAq? flickerAq, H264ForceFieldPictures? forceFieldPictures, H264FramerateControl? framerateControl, int? framerateDenominator, int? framerateNumerator, H264GopBReference? gopBReference, int? gopClosedCadence, int? gopNumBFrames, double? gopSize, H264GopSizeUnits? gopSizeUnits, H264Level? level, H264LookAheadRateControl? lookAheadRateControl, int? maxBitrate, int? minIInterval, int? numRefFrames, H264ParControl? parControl, int? parDenominator, int? parNumerator, H264Profile? profile, H264QualityLevel? qualityLevel, int? qvbrQualityLevel, H264RateControlMode? rateControlMode, H264ScanType? scanType, H264SceneChangeDetect? sceneChangeDetect, int? slices, int? softness, H264SpatialAq? spatialAq, H264SubGopLength? subgopLength, H264Syntax? syntax, H264TemporalAq? temporalAq, H264TimecodeInsertionBehavior? timecodeInsertion})

H264Settings.fromJson(Map<String, dynamic> json)

factory

Properties

adaptiveQuantization → H264AdaptiveQuantization?

Adaptive quantization. Allows intra-frame quantizers to vary to improve visual quality.

final

afdSignaling → AfdSignaling?

Indicates that AFD values will be written into the output stream. If afdSignaling is "auto", the system will try to preserve the input AFD value (in cases where multiple AFD values are valid). If set to "fixed", the AFD value will be the value configured in the fixedAfd parameter.

final

bitrate → int?

Average bitrate in bits/second. Required when the rate control mode is VBR or CBR. Not used for QVBR. In an MS Smooth output group, each output must have a unique value when its bitrate is rounded down to the nearest multiple of 1000.

final

bufFillPct → int?

Percentage of the buffer that should initially be filled (HRD buffer model).

final

bufSize → int?

Size of buffer (HRD buffer model) in bits.

final

colorMetadata → H264ColorMetadata?

Includes colorspace metadata in the output.

final

colorSpaceSettings → H264ColorSpaceSettings?

Color Space settings

final

entropyEncoding → H264EntropyEncoding?

Entropy encoding mode. Use cabac (must be in Main or High profile) or cavlc.

final

filterSettings → H264FilterSettings?

Optional filters that you can apply to an encode.

final

fixedAfd → FixedAfd?

Four bit AFD value to write on all frames of video in the output stream. Only valid when afdSignaling is set to 'Fixed'.

final

flickerAq → H264FlickerAq?

If set to enabled, adjust quantization within each frame to reduce flicker or 'pop' on I-frames.

final

forceFieldPictures → H264ForceFieldPictures?

This setting applies only when scan type is "interlaced." It controls whether coding is performed on a field basis or on a frame basis. (When the video is progressive, the coding is always performed on a frame basis.) enabled: Force MediaLive to code on a field basis, so that odd and even sets of fields are coded separately. disabled: Code the two sets of fields separately (on a field basis) or together (on a frame basis using PAFF), depending on what is most appropriate for the content.

final

framerateControl → H264FramerateControl?

This field indicates how the output video frame rate is specified. If "specified" is selected then the output video frame rate is determined by framerateNumerator and framerateDenominator, else if "initializeFromSource" is selected then the output video frame rate will be set equal to the input video frame rate of the first input.

final

framerateDenominator → int?

Framerate denominator.

final

framerateNumerator → int?

Framerate numerator - framerate is a fraction, e.g. 24000 / 1001 = 23.976 fps.

final

gopBReference → H264GopBReference?

Documentation update needed

final

gopClosedCadence → int?

Frequency of closed GOPs. In streaming applications, it is recommended that this be set to 1 so a decoder joining mid-stream will receive an IDR frame as quickly as possible. Setting this value to 0 will break output segmenting.

final

gopNumBFrames → int?

Number of B-frames between reference frames.

final

gopSize → double?

GOP size (keyframe interval) in units of either frames or seconds per gopSizeUnits. If gopSizeUnits is frames, gopSize must be an integer and must be greater than or equal to 1. If gopSizeUnits is seconds, gopSize must be greater than 0, but need not be an integer.

final

gopSizeUnits → H264GopSizeUnits?

Indicates if the gopSize is specified in frames or seconds. If seconds the system will convert the gopSize into a frame count at run time.

final

hashCode → int

The hash code for this object.

no setter, inherited

level → H264Level?

H.264 Level.

final

lookAheadRateControl → H264LookAheadRateControl?

Amount of lookahead. A value of low can decrease latency and memory usage, while high can produce better quality for certain content.

final

maxBitrate → int?

For QVBR: See the tooltip for Quality level

final

minIInterval → int?

Only meaningful if sceneChangeDetect is set to enabled. Defaults to 5 if multiplex rate control is used. Enforces separation between repeated (cadence) I-frames and I-frames inserted by Scene Change Detection. If a scene change I-frame is within I-interval frames of a cadence I-frame, the GOP is shrunk and/or stretched to the scene change I-frame. GOP stretch requires enabling lookahead as well as setting I-interval. The normal cadence resumes for the next GOP. Note: Maximum GOP stretch = GOP size + Min-I-interval - 1

final

numRefFrames → int?

Number of reference frames to use. The encoder may use more than requested if using B-frames and/or interlaced encoding.

final

parControl → H264ParControl?

This field indicates how the output pixel aspect ratio is specified. If "specified" is selected then the output video pixel aspect ratio is determined by parNumerator and parDenominator, else if "initializeFromSource" is selected then the output pixsel aspect ratio will be set equal to the input video pixel aspect ratio of the first input.

final

parDenominator → int?

Pixel Aspect Ratio denominator.

final

parNumerator → int?

Pixel Aspect Ratio numerator.

final

profile → H264Profile?

H.264 Profile.

final

qualityLevel → H264QualityLevel?

Leave as STANDARD_QUALITY or choose a different value (which might result in additional costs to run the channel).

final

qvbrQualityLevel → int?

Controls the target quality for the video encode. Applies only when the rate control mode is QVBR. Set values for the QVBR quality level field and Max bitrate field that suit your most important viewing devices. Recommended values are:

final

rateControlMode → H264RateControlMode?

Rate control mode.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

scanType → H264ScanType?

Sets the scan type of the output to progressive or top-field-first interlaced.

final

sceneChangeDetect → H264SceneChangeDetect?

Scene change detection.

final

slices → int?

Number of slices per picture. Must be less than or equal to the number of macroblock rows for progressive pictures, and less than or equal to half the number of macroblock rows for interlaced pictures. This field is optional; when no value is specified the encoder will choose the number of slices based on encode resolution.

final

softness → int?

Softness. Selects quantizer matrix, larger values reduce high-frequency content in the encoded image.

final

spatialAq → H264SpatialAq?

If set to enabled, adjust quantization within each frame based on spatial variation of content complexity.

final

subgopLength → H264SubGopLength?

If set to fixed, use gopNumBFrames B-frames per sub-GOP. If set to dynamic, optimize the number of B-frames used for each sub-GOP to improve visual quality.

final

syntax → H264Syntax?

Produces a bitstream compliant with SMPTE RP-2027.

final

temporalAq → H264TemporalAq?

If set to enabled, adjust quantization within each frame based on temporal variation of content complexity.

final

timecodeInsertion → H264TimecodeInsertionBehavior?

Determines how timecodes should be inserted into the video elementary stream.

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toJson() → Map<String, dynamic>

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited