On Wed, Aug 27, 2008 at 12:45:19AM +0200, Josef Wolf wrote: > BTW: what is the DTS good for? Isn't PTS the relevant time for playbacK? > What difference does it make when a frame was decoded as long as it > is presented at the correct time? > > And what is the SCRB good for? I am totally confused by all those > times. I have found a good reading on http://www.tek.com/Measurement/programs/mpeg_fundamentals/ This reading is much more comprehensive than the iso-13818-1. Page 47 explains PTS/DTS. In a nutshell, DTS is needed because of bidirectional video encoding. As an example, pictures can be presented in order IBBP, but for decoding the order would be IPBB because the B pictures depend on the I and P pictures. Since decoders can decode only one picture at a time, DTS is used to signal that decoding have to be done in a different order than presentation. So now my understanding is that for determining packet order in the PS, DTS has to be used if it exists. If no DTS exists, then PTS is to be used. Guess, my understanding is still wrong. But I need a starting point from which I can remove errors step by step ;-) _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
