Rendering issues-Please Help

DavidY wrote on 1/8/2005, 9:51 AM
I have made a 30 second clip of lighting strikes over a lake. I did it by taking 20min of raw footage from a lightning storm and trimmed out only the sections that have flashes of light so most of the clips are 1/2 second to 1 second. I then put all the clips together to make an awesome light show. I was really please with the results until I rendered it. When rendering, I get horizontal black lines across the screen for most clips. It looks terrible. I tried rendering to .avi /NTSC DV, MPEG 2 and any other format possible but it does not want to go away. Any help would be appreciated as I have a lot of time into this and it will all be garbage if I cannot get this to work.

David Y

Comments

B.Verlik wrote on 1/8/2005, 1:25 PM
The horizontal lines, due to rendering, doesn't make any sense. If you're not seeing these lines, when watching the .avi in the timeline, then they shouldn't be rendering in afterwards. Maybe this has happened to somebody else and they'll tell you the cause. Are these lines slightly visable at all, before rendering?
BillyBoy wrote on 1/8/2005, 1:28 PM
Such problems SCREAM for the actual video so we can SEE what's happening. Can you put a little sample up on the web?
DavidY wrote on 1/8/2005, 1:47 PM
The lines are not visable at all when watching on the timeline.

How and where would I post a sample on the Web?

David
Liam_Vegas wrote on 1/8/2005, 2:03 PM
Try Chienworks VegasUsers site
DavidY wrote on 1/8/2005, 2:23 PM
Ok thanks. I have posted it on VegasUsers site. It is named Lightning Intro-DavidY. I just did it so it may take some time before it is actually on the site.

Check it out and let me know what you think. Again I do not see the lines when played in the timeline before rendering.

DavidY
Chienworks wrote on 1/8/2005, 3:44 PM
This was more of a testbench sorta thing, so i put it here:
http://www.vegasusers.com/testbench/files/davidy-lightning_intro-davidy.mpg
it's about 4.2MB.

These are definately interlacing lines. The problem you're having is that the lighting flashes are so brief that they're only lighting up one field at a time. The other field is dark. So when you view the footage on a progressive monitor you see every other line coming from the lighting flash and the lines inbetween coming from the dark field.

Notice that a couple of times the flash lasted longer and there were no lines.

Most likely the reason you don't see it in the preview window is because your window is half-size or smaller. If it's half-size then you only see every other line, and interlacing effects aren't apparent. Set the preview window to Full and you'll see them.
DavidY wrote on 1/8/2005, 5:18 PM
So is there any way to fix it?
DavidY wrote on 1/8/2005, 5:23 PM
You are correct. I have changed it to full screen and they are there. Again is there anything I can do to clean it up?

David
Chienworks wrote on 1/8/2005, 5:30 PM
You could try "blend fields" as the interlace removal method. Since it's not motion that is causing the problem this may look very good. It may also dim the image a bit, but color curves will restore that.
rebel44 wrote on 1/8/2005, 5:44 PM
Are you shure that you did not render in PAL?
DavidY wrote on 1/8/2005, 6:19 PM
Definately did not do it in PAL.

I can not find an option to blend fields. When in the rendering menus the field order gives options for interlaced, bottom field first or interlaced, top field first or progressive only. How do I blend them?

David
DavidY wrote on 1/8/2005, 6:29 PM
When I go to to the link to see the video on the Web I get "problems connecting to Media (timed out)". Any idea why that is?

David
DavidY wrote on 1/9/2005, 1:31 PM
I am still having no luck with this. Anybody know how to "blend feilds" to help the issue?

David
BillyBoy wrote on 1/9/2005, 1:50 PM
Blending fields referers to PROJECT settings.

Click on File/Properties/deinterlace method then pick blend fields. Also try the others, it really depends on your preferences, source file.