Originally Posted by jjeff
Thanks Trip, looks like a fair number PBS channels broadcast in 720p, is this becoming more common(not just with PBS but other networks also) to downconvert to 720p or is it very rare?
It's rare with most other networks, unless you're doing dual HD. Then a 1080i will usually be converted to 720p. There are also a few ABC stations that get converted to 1080i for one reason or another. One that comes to mind is WFAA Dallas.
I have a non-PBS cross-conversion list here: http://www.rabbitears.info/oddsanden...equest=netflip
You'll note a good number of them are CW or My affiliates that are cross-converted to match the resolution of a sister station.
BTW I'm a little confused with your listings for PBS channel 2.2(MN channel). You list it as physical channel 34.4 in one spot KTCA(which I believe it is) but under KTCI you have it listed as display channel 17.2 and Physical channel 23.7. I believe the KTCI part is wrong, we no longer have a display channel 17 and the MN channel is on physical channel 34.
For whatever reason, KTCI is feeding MN Channel that has been mapped to 17-2 on and off. Don't ask me why, because you're correct about its presence on KTCA 2-2, but it's in the TSReader data.http://www.rabbitears.info/screencap.../68597-0_0.htm
This particular capture doesn't have it mapped, but you can see Program 7 listed and its use of 2 Mbps in the usage chart at the bottom. In this case, due to lack of PSIP associated with it, it would display as 23-7 on some TVs and others would ignore it. I've left it as 17-2 even though my most recent capture doesn't have it mapped because I didn't want to confuse people with regard to WUCW.
When I do a channel scan on my Sony TV I do get 23.8 and 23.9 but as you say it's just dead air.
It's not dead air per se. It's datacasting that is used for software updates to certain devices. Of course, as such, it will never display any kind of programming, so you might as well call it dead air.
Originally Posted by TCDTV
In case others missed it in my earlier post, the exact reason TPT gave me for the change was: So far I'd definitely say the "better quality" part is still missing.
In the presence of a lot of subchannels or high compression for any reason, you tend to get less pixelation when you use 720p versus 1080i. This is why stations that are doing dual HD are usually (though not always) doing dual 720p. I have a list of those, too.http://www.rabbitears.info/oddsanden...request=dualhd
That's what they mean when they say "better quality."