WFAA ABC DALLAS 8.3 now has "THIS" - Page 2

Jim5506 · #11 (**permalink**) 10-29-2009, 07:47 PM

We have a channel carrying 2 720p feeds and a 480p feed all on one channel.

The HD channels are a bit soft (8.1Mbps for 720p) but definitely 1000% better than SD which is about 2.2Mbps on the 3rd channel.

CowboyDren · #12 (**permalink**) 10-29-2009, 08:03 PM

Woooow. I was watching "The Dark Crystal" from a DVD release dated 1999, and it worked out to be about 3.8Mbps. I felt like my eyes were going to start watering at any minute.

We have a religious channel in KC that multicasts 5 480i streams on one channel, and it's totally unwatchable on anything over a 19" screen. I wonder if even they are using the full 3.8Mbps on those five streams.

Jim5506 · #13 (**permalink**) 10-30-2009, 03:38 PM

Rabbitears.info has listings of many stations across the country and the bitrates they are using.

Info is gathered locally by volunteers with a USB digital tuner and a TS reader, then sent to Rabbitears.info for inclusion in their tables.

If its KTAJ you are talking about their bitrates are 2.58, 4.28, 4.67, 2.23 and 5.23 for channels 16.1-16.5 respectively.

They are probably using a variable multiplexer that balances the bitrate with the complexity of the picture being sent over each different channel, so a static screen would for the moment have a low bitrate, while a high motion screen would demand a higher bitrate, assuming one of the other channels could be prioritized lower - a real juggling act.

**Iceberg** · #14 (**permalink**) 10-30-2009, 03:40 PM

Quote:

Originally Posted by CowboyDren

We have a religious channel in KC that multicasts 5 480i streams on one channel, and it's totally unwatchable on anything over a 19" screen. I wonder if even they are using the full 3.8Mbps on those five streams.

must be TBN

We have the same thing here in Minneapolis but its on a Low powered digital station. Noticed that JCTV (the music video one) usually has the most bandwidth of the 5

JB Antennaman · #15 (**permalink**) 11-01-2009, 11:42 PM

Quote:

Originally Posted by Jim5506

We have a channel carrying 2 720p feeds and a 480p feed all on one channel.

The HD channels are a bit soft (8.1Mbps for 720p) but definitely 1000% better than SD which is about 2.2Mbps on the 3rd channel.

Your tuner will usually uplink the 720P signal up to the level of 1080I - so there is no reason to fret when the signal is not 1080I

boba · #16 (**permalink**) 11-02-2009, 09:33 AM

Let's get back on topic. If you want to argue about HDTV resolutions start another thread in another forum. This was a question about a programming service and where they are available.

Splicer · #17 (**permalink**) 11-13-2009, 02:55 PM

I'm sorry boba, but I feel compelled to straighten this out.

Quote:

Originally Posted by JB Antennaman

Your tuner will usually uplink the 720P signal up to the level of 1080I - so there is no reason to fret when the signal is not 1080I

Again, an unthoughtful reply.

JB, You don't know if this member has a STB for a tuner or if it is the displays built-in tuner. Thats first. Second, you have no idea what type of display he has. Both of these facts needs to be known before you jump right in and make statements like that.

First, it isn't "uplink". It is scaled, or upconverted. Second, if it is a STB then the output is user selectable. So if the incoming HD signal is 720p, the user can have the output to 480p, 720p, or 1080i, his choice.

Now depending on the type of display, regardless of the input signal, and this includes built-in tuners, the input signal is virtually moot since the signal will be converted to the displays native resolution. Some LCDs are 720p natural resolution. So in the case of having a STB, a 720p input signal JB, and using your logic that the tuner will scale that to 1080i, it doesn't matter because the TV is going to down convert to its native resolution of 720p. If the display is a newer LCD then the signal (720p or 1080i) will be scaled to 1080p. If a 480p signal is the source signal, that 480p will be converted to 720p or 1080p, again depending on the display type.

If the display is CRT then again, the incoming signal (480p, 720p) is going to be scaled to 1080i.

There is much more but I don't have the time to keep correcting you JB, so this should be enough to get you straightened out on how this all works. I really hope you take my advice and put some real thought into your replies, before just posting willy-nilly.