Contents

kVTCompressionPropertyKey_VBVInitialDelayPercentage

Declaration

let kVTCompressionPropertyKey_VBVInitialDelayPercentage: CFString

Discussion

Initial delay of the VBV model between storing the picture in the VBV buffer model and decoding of that picture, as a percentage of VBV buffer duration.

This value should be specified as a number in the range of 0 to 100. Larger value increases the delay but results in smoother playback. Default value is 90, meaning 90% of the VBV buffer duration. This property key is incompatible with:

  1. kVTCompressionPropertyKey_AverageBitRate,

  2. kVTCompressionPropertyKey_DataRateLimits,

  3. VTVideoEncoderSpecification_EnableLowLatencyRateControl=True.

See Also

Rate Control