Interlace flicker

drtelemark wrote on 9/14/2002, 7:20 PM

I just was working on trying to solve the interlace flicker problem with hi-res images imported into the timeline, or motion artifact. It only happens when I export to video tape and also making DVD's and watch them on a TV monitor.
The flicker problems is one that has frustrated me for some time. Here is what I found that works for viewing the video on NTSC TV standards.

First, I render the video with resampling and reduce interlace flicker SELECTED for all stills and slo-mo. Then after the file is rendered (in MPEG-2 format), I re-rendered the new file into MPEG-2 again or AVI with just reduce interlace flicker selected, and it appears to have fixed the problem.

I suspect there is a better solution, like reducing the interlaceing time (maybe to 0.1 sec instead of 0.250?) but I haven't tried that yet. Is there a way to do this in the first rendering instead of having to apply the interlace flicker reduction twice?

Comments

John_Cline wrote on 9/14/2002, 10:34 PM

First of all, you're confusing "interlacing" with "interleaving" which is what the .250 sec thing is all about. Interleaving is how often a chunk of audio is written in between the video frames. Changing the interleaving will do absolutely nothing to solve the flicker problem, interlacing and interleaving are two completely different things.

Now, a lot of people assume that when they see flicker on scanned images that it is an interlacing issue. That's partially true. If the scanned image has some thin horizontal lines in it, that will drive the interlacing nuts. However, it's usually that the image just has far more detail in general than an NTSC or PAL television can handle. Try bluring the image slightly and see if that doesn't help.

The reason that MPEG2 encoding it twice works is that the second pass acts like a blur filter which reduces the high frequency detail down to a level that the TV can deal with without "ringing."

John