Originally Posted by dtv insider
What is up with ThinkTv one HD channel and 4 SD channels.
I'm guessing that it's probably a mistake or a test, and it's not happening on WPTO-DT(of course there programming is completely different anyway), just WPTD-DT ... Hope so anyway, I've seen it happen before ...
Update: Then again, with WCET-DT reportedly changing their HD service from 24/7 -* PBS HD channel feed next week to simulcasting the WCET 48 analog programming, with HD "only" presumably only when it's available for that programming schedule (No HD for "lawrence welk" for instance, so there will likely be a lot of SD upconverts on there now whearas now it's HD(or Widescreen SD upconverted at PBS) on 48.1 whenever the station is on the air) : It certianly would be nice if WPTD-DT could start sending the PBS HD channel 24/7 rather than just 6pm to 6am .... However, They should drop all the SD channels (or at least all but 1 of them, or transcode to 720p and multicast 1 or 2 SD subchannels) though, and make WPTD-DT HD only for the best quality .... The SD channels can go on WPTO-DT, at least 6 of them ...
* - except OTA when WCET goes off air 1am~6am 3 or 4 nights a week, and except between 6pm~7:30 M~F when they've been upconverting Newshour/NBR lately ..
It's varying quite a bit, but the 1080i HD video on 16-6 is getting between about 5~8Mb/s currently, with the SD video running about 2mb~3mb/s or so max per channel .... Although the MPEG2 blocking issues are horrible on the HD channel, I'm surprised it's not worse, it's bad enough with 2SD+1 HD ....
Files in Attached zip file archive shows analysis of their transport stream, currently, with video thumbnails/screenshots for the video decode (from TSreader html export) ... Just unzip them all and click on the HTMl file for the text, scroll down to near bottom for "PID usage list" for the bandwidth usage (PID 0x0071 is 16.6 HD video) .... Sorry the filenames got changed during the zip as I'm using an "ancient" version of PKzip(dos) that supports 8.3 characters max for filenames so you'll have to click on the jpgs for the video decode thumbnails, they would usually show up in the HTML file) ..
WPTDDT.ZIP 168.4541015625k . file