DVD TV Flicker.. (Technical Question)

[Guest]

Hello all.

I have the professional version of DVDit and i have a question. I've noticed with editing and direct export of DV from premiere to a tv that on certain graphics done in photoshop produce an annoying flicker. After some tinkering, i discovered i could eliminate the flickering effect from text and graphics on my videos by applying a guasian blur and making them less sharp before export. My question is - should i slightly blur my buttons for the DVD menu before importing them into DVDit, or does it adjust buttons automatically to produce less flicker like other DVD authoring programs do? Any help from someone whos experienced with this would be appreciated

Also one final question, i've been led to believe i should import menus to DVDit at 640 by 480 resolution, but won't this leave black borders on my PAL television system which uses 720 by 576?

~ David.

[Mad_Max_73]

Field Dominance

If you're going to play an interlaced video on an interlaced display, it's important to understand the concept of field dominance (aka field order). As I discussed earlier, an interlaced display updates each field separately. This brings up a question: which field should be updated on the display first? Field dominance defines the answer to that question.

Because the fields represent series of progressing moments in time, there can only be one correct order in which to display them. If the order is reversed, the video will quickly alternate between going forwards and backwards in time, leading to jerky motion. The field dominance simply states whether the top/odd field or the bottom/even field is supposed to be shown first. For example, a dominance of 'top field first' would mean that the top field is displayed before the bottom field in a frame.

In general, there is no consistent field dominance. Each capture card and video source can lead to a different field dominance. One way to determine the correct field dominance is to play a segment of your video on a TV. If the motion is jerky, try changing the field dominance so the other field is displayed first (dominant). You can also determine field dominance by using Avisynth. See the Classifying Your High Resolution Video page for more information. (Note: If you're working with DV video, it's usually bottom (even) field dominant.)

Look at...

http://www.geocities.com/lukesvideo/index.html

[Nielchiano]

Right Mad_Max_73, but I don't think that that is the problem with NiGHTS. He sais: "...that on certain graphics done in photoshop produce an annoying flicker" So I suppose those parts of the video is a still picture?

If that is the case, the problem IS interlacing, but not realy field dominance, since the next odd field will be exactly the same as this odd fiels as the previous odd field as...

The trick can be done with a blur (whatever kind), since that blurs the two fields a bit together. the problem is that you only display half of the lines, then the other half, then back the first...

You can try the Premier's option "Optimize Stills". that might do the job. If that doens't work, try to do your photoshop pictures at half the resulution (at least in the number of lines, horizontaly doen't realy matter) and then resize them (this will make both fields the same and thus remove any flikker).

If the parts you're referring to is NOT still, then Mad_Max_73's explanation is the solution.

Hope this helps,
Nielchiano.