Creates a missing-plugin message for element to notify the application that a certain required element is missing. This function is mainly for use in plugins.
the #GstElement posting the message
the name of the missing element (element factory), e.g. "videoscale" or "cdparanoiasrc"
a new #GstMessage
Creates a missing-plugin message for element to notify the application that a certain required element is missing. This function is mainly for use in plugins.