kVTCompressionPropertyKey_MoreFramesBeforeStart
A Boolean value that indicates whether and how a compression session concatenates frames with other compressed frames to form a longer series.
Declaration
let kVTCompressionPropertyKey_MoreFramesBeforeStart: CFStringDiscussion
This value is true if frames compressed in a separate session will be concatenated before the beginning of the current session. The value is false if the current session is a stand-alone session, or if this session will encode the first segment of a multi-segment compression. The default value is false.
This information enables video encoders to ensure that compressed segments can be concatenated smoothly – for example, avoiding data rate spikes where segments are joined.
See Also
Rate Control
kVTCompressionPropertyKey_AverageBitRatekVTCompressionPropertyKey_ConstantBitRatekVTCompressionPropertyKey_DataRateLimitskVTCompressionPropertyKey_EstimatedAverageBytesPerFramekVTCompressionPropertyKey_MoreFramesAfterEndkVTCompressionPropertyKey_QualitykVTCompressionPropertyKey_TargetQualityForAlphakVTCompressionPropertyKey_VariableBitRatekVTCompressionPropertyKey_VBVBufferDurationkVTCompressionPropertyKey_VBVInitialDelayPercentagekVTCompressionPropertyKey_VBVMaxBitRate