[Tim Ward]

SDI video downlinked from satellite . I am then encoding it using MPEG2 Encoder at 352 X 576 video resolution. Then I decode it using IRD, and give SDI out of IRD to professional monitor.

Okay, I’m not quite following your signal path. Is it: 352×576 video Encoder -> SDI Out to satellite uplink -> downlink to IRD -> SDI Out to monitor?

Also, what is the purpose for the 352×576 video?

What i have doubt is whether SDI out of IRD would be picture of 352 X 576 pixels and then monitor expands it to full frame ?? or it is IRD which gives full frame SDI video out to monitor ?

The IRD SDI Output sends out full-size video at 704×576. SDI only supports broadcast-sized video frame sizes.

tim

[Tim Ward]

Boy, the ‘backwards battery’ didn’t even occur to me! Over-analyzing is SO over-rated! 🙂 That’s probably it. Betcha that’s why Lawrence hasn’t posted back — he figured it out on his own.

tim

[Tim Ward]

Yes and no. The live truck would be using a digital microwave link, similar to the STL microwave system used in-between the studio and DTV transmitter. You’d have to use an HDV deck with HD-SDI and output, into the HD-SDI input of a digital microwave transmitter back to the studio. Here’s an example of such a transmitter.

Another option that would NOT be for live shots would be establishing a network connection across the microwave link and transferring the HDV video files from an NLE across the computer network to the station.

Of course, this is all new, emerging technology, and I don’t claim to know exactly what would be involved.

Maybe a DTV engineer will stop by, but then again, these aren’t the types of forums I’d picture them in! 😉 Then again, if you do work at a TV station, check with the engineers. They’ll either tell you how it can be done, or not have a clue as to what you’re talking about!

tim

[Tim Ward]

Sorry for the slim descriptions above — not too informative.

NTSC D1/DV and PAL D1/DV are all based on the analog 525-line NTSC and 625-line PAL standards, respectively. As I understand it, these formats were designed to work within the existing NTSC workflow, and were around before the ATSC formats were standardized. Notice how with the HD formats, there is no “NTSC” or “PAL” designation. The only sign of the different TV systems is the frame rate: 60i/30p and 50i/25p.

Someone with a much more though understanding of the inner workings of DTV is Mark Schubin< /a>. That’s one smart dude.

tim

[Tim Ward]

Welcome to the COW!

For what purpose do you need to see this resolution? What is the source and destination of the video? Is that the entire frame size?

If I understand correctly, your 352×576 (half-res SDI) video is being stretched horizontally to fill the screen. A software example would be using Adobe After Effects to view the frame un-altered. A hardware solution would be to use a DVE (digital video effects) machine to resize it.

An SDI monitor will only display the full raster of the signal — in your case, 704×576. I suspect that the source of the stretching is coming from a device prior to the monitor.

More information on your workflow would really help.

tim

[Tim Ward]

Just to add some clarification…

NTSC refers only to analog video.
ATSC is any of the SD and HD digital video formats.

tim

[Tim Ward]

It may need to be re-initialized or something. Contact Ikegami, they’d definitely know.

Ikegami Contact Info

tim

[Tim Ward]

I’m desparately trying to calibrate them *close* to my Sony BVM

Keep in mind that computer displays do not work in the same color space as video displays. You should be able to match the white balance and, to some degree, the gamma.

What are you using these monitors for? Are they just for the computer display? If so, then no problem. If you want to use them for video displays, do NOT rely on them for any critical monitoring (color correction/image grading). They will mislead you because of the difference in color space.

Should I send it back?

I would. If one looks good and the other decides to be pinkish, I’d exchange it.

tim

[Tim Ward]

However, when I hit the “B” button for blue only I don’t see what I’m used to seeing on other monitors when I hit the button.

That’s not the “blue-only” button. Those buttons turn off the associated color. To get blue, turn off red and green. Then all you have left is a “blue” monitor. Cheer up!

tim

[Tim Ward]

Yeah I figured that’d be a better way to go, but thought I’d give the COW a shot. I’ll have to sort through all the “Region-Free Hack!”s hits though! Thanks for the insight.

tim