The immediate mode permits the insertion of payload-specific headers (e.g. the RTP H.261 header). For hint tracks where the media is sent ‘in the clear’, the sample entry then specifies the bytes to copy from the media track, by giving the sample number, data offset, and length to copy.
The track reference may index into the table of track references (a strictly positive value), name the hint track itself (-1), or the only associated media track (0). (The value zero is therefore equivalent to the value 1.)

public class Mp4RtpImmediateConstructor : Mp4RtpConstructor

Public Class Mp4RtpImmediateConstructor
	Inherits Mp4RtpConstructor

public ref class Mp4RtpImmediateConstructor : public Mp4RtpConstructor

type Mp4RtpImmediateConstructor =  
    class
        inherit Mp4RtpConstructor
    end