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Dec 01
2008
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Interlaced Video an excellent explanationPosted by camthecameraman in Video Editing, Video Clip, Video Camera, MPG, Interlaced, Interlace, Flickering, Files, Encoding, DVD Studio Pro, DVD problems |
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When I started this blog my intention was to come up with original content, I intend to do that but I also feel it is important to highlight great answers written by other bloggers. I dont want this site to become a pointer to other sites rest assured I will continue to comment and write my own articles. One of the most common issues I hear when it comes to editing, shooting and encoding (in fact a student here at TAFE just said "Why is this still picture flickering on the monitor) comes back to interlacing issues.
Problems present as "shimmering" still pictures, jerky or jumpy moving shots to footage that "doesn't look right". Usually it is caused by multiple software packages treating footage or stills differently or more correctly interpretting the interlaced image differently. I wont keep writing about this as a far more intelligent and eloquent blogger than myself has written an excellent page of information with diagrams etc on this subject. Check out http://www.100fps.com
This page on the EBU site is also a good explanation of interlace versus progressive - http://www.ebu.ch/en/technical...orial.html.
I often wonder why HDTV at 1080i it promoted so hard when there are only a few devices, all in hte professional domain, that are actually capable of natively showing an interlaced HDTV picture. They're all CRTs, by the way. LCDs and plasmas are all natively Progressive and need fancy processing to display interlace images.
Interlace also compresses badly in MPEG compared to progressively scanned pictures. So why do we get sold on 1080i? Consumers are being told that 1080i is better than 720p because the number is bigger. More lines.
Next time you look at Foxtel HD, look at Fox Sports HD (1080i) and compare it to ESPN (720p). Surprise - ESPN looks better, especially when things start moving.
