hello The best way to assure that the there is no overflow underflow in the T-STD buffers, according to my knowledge (pls correct me if I am wrong), would be to emulate the T-STD buffers at the transport stream generation end. This ensures that the PTS and the DTS coded is right. regards vinod Ori Pessach wrote: > > Thenmozhi, > > What do you use as an output device? Do you feed some hardware on the back end, or > do you just generate a bitstream, store it someplace, and then use a software > decoder to read it? > > The reason I'm asking is that typically, your TS bitrate is determined by your > output medium. A 64QAM digital cable system will have a bitrate of 26970350 bps, > for example. You'll have to generate enough null packets to get that bitrate. > > As Vinod pointed out, you'll have to worry about the T-STD. Read that part of the > spec, and then read it again. Then sleep over it, and read it once more. It's > nasty, but it's good for you. > > Cheers, > > Ori > > Vinod Kumar wrote: > > > Hi > > yes the padding of the transport stream with the null packets will be > > constrained upon the fact that the TSD buffers at the transport stream > > will not overflow. > > > > Thenmozhi Arunan wrote: > > > > > > I'm not sure if this is the right mailing-list to post this query? If not > > > pls redirect me to mailgroups that discuss mpeg-2 systems. > > > > > > In our multimedia lab, I have been working on developing a s/w > > > transport stream multiplexer. I have it working and a std IRD is able to > > > decode the stream. It is a single program ts generator. However, I'm not > > > clear as to what should be set as the TS bitrate value. > > > > > > Currently, i'm setting ts bitrate = video_bitrate + audio bitrate + psi > > > rate + overhead for PES/TS headers + alpha(for null packets). > > > > > > How can one decide on the # of null pkts that will be required for > > > multiplexing? It could depend on vbv_buffer size used in mpeg-2 encoding. > > > > > > Your suggestions are most appreciated. > > > Thenmozhi > > > -- > > > ---------------------------------------------------------------------------- > > > Thenmozhi Arunan > > > then@xxxxxxxxxxxxxxxxxxxxxxx DV012, Vigyanpura Campus, > > > Multimedia Systems Lab IISc Quarters, (Opp ISRO Headquaters) > > > SuperComputer Educ & Research Centre New BEL Road > > > Indian Institute of Science Bangalore-560094 > > > Bangalore-560012, India. KARNATAKA,India > > > Office Ph: 80-309 2896. Home Ph: 341 1952 > > > ---------------------------------------------------------------------------- > > > -- Vinod Kumar MV Research Engineer Video Coding Group Fraunhofer Institut für Integrierte Schaltungen Am Weichselgarten 3, D-91058 Erlangen, Phone : +49 (0) 9131 / 776 363 Fax : +49 (0) 9131 / 776 999
