Prepare a new seamless segment for emission downstream. This function must
only be called by derived sub-classes, and only from the create() function,
as the stream-lock needs to be held.
The format for the new segment will be the current format of the source, as
configured with BaseSrc.setFormat
Prepare a new seamless segment for emission downstream. This function must only be called by derived sub-classes, and only from the create() function, as the stream-lock needs to be held.
The format for the new segment will be the current format of the source, as configured with BaseSrc.setFormat