A couple of questions: 1) Why does ATSC even care about PID values, given that no dual mode (ATSC/DVB) receiver exists or would ever be built? 2) If a DTV station were to continue using PID's below 0x30, would they ever receive a citation (pink ticket) from the FCC? Ron John Willkie wrote: >Okay, the first item was a poke. As to the other items, I think we will >have to agree to disagree, because there is no need to belabor our points: >time will tell. > >However, I object strongly enough to the following to object: > > > >>You should understand this better than anyone. If they can't get >>something as simple as PSIP right, how the hell are they going to use >>demographic data to drive customized ads to specific sub markets, >>much less individuals? >> >> > >Sure, it can be tough -- with the current divide between encoders and >multiplexers and PSIP generators to get MPEG-2 PSI and PSIP both right and >consistent with each other, and consistent with the elementary streams. > >But, it's too early to blame the broadcasters for this problem. I was >careful at the show to talk to most of, if not all of, the companies in the >encoder and transport stream test and measurement field. Since PSI and PSIP >is all I know, I spotted all sorts of out-of compliance encoders and t&m >gear that were analyzing transport streams that were out of spec with MPEG-2 >and DVB and ATSC. > >I have to be real careful here, and I offer a caveat: I can only mention >the name of "bad actors" with whom I have no chance of sale/strategic >alliance. Sometimes, what prevents a deal is a problem they have with me, >other times, what prevents a deal is a problem with them, and in some cases, >it's a problem with both. > >Encoders: >Ligos Corporation showed an encoder that permitted, in ATSC mode, elementary >streams on any pid from 16 to 8190. The minimum permitted now is 48; the >maximum permitted per ATSC is around 1000 (I don't have the spec in front of >me, and I wrote that part some months and years back. The engineer told me >"we wrote to the spec." And, I said "you didn't use the right spec on the >upside, and on the downside, the spec changed effective January 1, 2005." > >DoReMi's president interrupted me in the middle of a 6 second question. >He's tied with two others for my a**hole of the show award. > >Optibase told me that they would consider my solution to pid remapping when >I brought them a customer. (Ain't my job, and it won't happen in this >lifetime.) Ofem something or another is another tied honoree. I did get >them back; I leaned (twice) on their plasma displays. I hope my handprints >were there through the show. > >t&m >Every t&m company whose wares I sampled was showing out of compliance (per >MPEG-2, or ATSC or DVB) transport streams, usually on the "minimum pid >= 48 >issue." Not a single one of them flagged this issue. They would try to go >into another emission mode to solve the problem, but it's an MPEG-2 issue, >not an ATSC, DVB or ARIB one. > >It would be imprudent (and potentially costly) for me to identify these >firms: I'm talking to most if not all about licensing my PSI/PSIP t&m >system. I will say that I did not look to see f the Videotek monitors had >this issue, nor did I visit the Wegener booth. I did talk to the "usual >suspects" and found this is a widespread problem. > >So; > >If the encoders enable you to send out-of-compliance transport streams, and >the test and measurement gear doesn't flag out of complaince elementary >streams and program map table instances, how can one blame broadcasters -- >many, if not most are now in compliance with the minimum pid issue often >through kludges (program_number 1 on pid 48) -- for not detecting the >problem. > >John Willkie > > ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.