Aggregator.selectedSamples

void selectedSamples(gst.types.ClockTime pts,  gst.types.ClockTime dts,  gst.types.ClockTime duration,  gst.structure.Structure info =  null)

Subclasses should call this when they have prepared the buffers they will aggregate for each of their sink pads, but before using any of the properties of the pads that govern

how aggregation should be performed, for example z-index

for video aggregators.

If [gstbase.aggregator.Aggregator.updateSegment] is used by the subclass, it MUST be called before [gstbase.aggregator.Aggregator.selectedSamples].

This function MUST only be called from the #GstAggregatorClass::aggregate() function.

Parameters

`pts`	The presentation timestamp of the next output buffer
`dts`	The decoding timestamp of the next output buffer
`duration`	The duration of the next output buffer
`info`	a #GstStructure containing additional information