* It has to to take into account that probably the stream was not started at
* the beginning of the file, that the clock between the server and the client
* host may differ and that playback of the stream was delayed, e.g. because
* It has to to take into account that probably the stream was not started at
* the beginning of the file, that the clock between the server and the client
* host may differ and that playback of the stream was delayed, e.g. because