Interlacing and High Definition

Hi(Bonjour)!

Blue-Ray DVD and HD-DVD aren't there ( there are no Blue Ray burner, no Blue- Ray Authoriting application), it's very expensive to buy HD DVD burners or blanks.

HDV 1080i is an interlaced format designed to be played on HD TV set at in such format (if your HD TV set is a 1080i one).

HDV 780p is an progressive format designed to be player on HD TV set with 720 progressive format.

Your iMac's screen is not an interlaced one, thus the visual interlaced lines on display.

If you monitor your HDV content from your camcorder on HD TV set, you will barely notice the interlaced lines.

If you apply a desinterlace filter, your interlaced HD TV set will have to translate video to fit the interlaced format.

Michel Boissonneault

Hi(Bonjour)

No, because you actually burn HD content on standard definition DVD (within iDVD perhaps ?) and NTSC TV set in an interlaced format.

You original concern is caused bt the monitoring sequence on your computer display, wich is not designed to display accurately an interlaced format.

Michel Boissonneault

Hi(Bonjour)!

Broadcast safe filter is needed if you add external elements like stills or title or composite mode with "non broadcast" range of color.

This filter doesn't tweak interlace form of your footage. It just limit the color value to "fit" the broadcast color safe space.

Now, if you burn HDV (1920 X 1080) on standard definition DVD (720 X 680), you reduce by 6 times the pixels in each image. You downscale your material. When you display downscaled material on HD TV set, the monitor handles video signal to "fit" the large screen (1920 X 1080), so the material shows many degradation.

Make this test: edit your HDV content and pritni it to tape on your HDV camcorder. Use it as a VCR connected to your HD TV set and see the different: huge.

When HD DVD or Blue Ray burner/authoriting app and Hight def DVD player for home will be available, you'll get this kind of image.

By the way, HDV is the distributing format for HD content used by local cable company or satellite one.

See this link about HD distribution workflow:
http://www.digitaljuice.com/djtv/segmentdetail.asp?sid=163&sortby=&page=4&kwid=0&show=allvideos

Michel Boissonneault

Hi

Ive been meaning to ask about interlacing for a while now and since someone has bought about my relevant questions here it goes.

So having read the previous some of my questions have already been answered. You said that viewing your footage at smaller scales decreases the amount of visual interlaced lines you see (using my macbooks screen). So when i play my footage in either VLC or quicktime(not pro) at half size i still see alot of the lines however when i capture my footage in either FCE or Imovie, the capture window is roughly about the same size as my half sized 1080i footage viewed in VLC or QT but its crystle clear, no lines. why is this?

If i set my Sony HDR-FX7E to SD mode i can only assume i wont get the lines. ( i havent yet tried out the SD record mode)

So i have a Sony widescreen tv (not hd) and viewed my footage off the camera using it as a VCR on this tv and no lines there at all is this because it is downscaled by the tv?

thanks

Geoff

iMovie and FCE dump one field for display purposes.

SD is interlaced.

Your television display is an interlaced display, unlike your computer. It is timed to replay the interlaced image in 60th of a second intervals to produce the best motion possible.

Is there an filter in FCE to dump a field then, i used de-interlace filter and it really seems to soften the images quite a significant amount. I want the sharpest picture possible, any tips Tom

thanks again for your help, always appreicated

Geoff

That's exactly that the deinterlace filter does in FCE. It dumps a field, effectively halving the resolution of the image. There are third party deinterlacers that work better, but if you're going to be showing your material on TV why would you deinterlace it? It's designed for that.

I can't reproduce what you report with 1080i material. It works correctly on my video monitor. I can't imagine what has happened to the signal.