Lines through video when trying to render

[Shifty268]

Hey there im trying to render a DV video that i have edited to mpeg2 with vegas 4. I rendered it and then tyred to play it with WMP but there is heaps of lines through it, i think it's called interlacing. How can i fix this so there not all these lines going throught he video?

[jimmalenko]

If your intended playback device is a TV (ie DVD), then you should keep it interlaced. For PC playback, use a software player that deinterlaces, like PowerDVD.

[Shifty268]

ok i tryed that, But how do i make it so i can view it in windows media player. Do i have to render it without interlacing?

[jimmalenko]

yep, deinterlace if you MUST play it through WMP.

[Shifty268]

How do i do that?

[jimmalenko]

any encoder should be able to deinterlace.

[Shifty268]

ok i need bit more help than that. I want to be able to render straight fro vegas 4 to mpeg file and be able to open that file without having interlacing stuff. I don't really unserstand interlace and deinterlace acn you explain

[Radixmind]

very quick description of interlacing coming up:

because VIDEO has less FRAMES in it than FILM (as it is projected at the cinema), motion in the frame is less smooth. video compensates for this by having each FRAME made up of two FIELDS. these FIELDS are like two seperate FRAMES, cut up into long horizontal strips and woven together, one line from FIELD 1, one from FIELD 2, and so on.
if you cant visualise that, try holding your hands so your palms are facing you, then shove the fingers together, one between the other. your hands are the FIELDS, and the result is a FRAME. OK?
FIELDS make VIDEO motion nice and smooth when viewed on a TV screen, but on a computer you can sometimes see horizontal lines in movement, because of the higher resolution of the monitor.
FILEDS are also responsible for that weird effect found when pausing some older VCR's, where any moving figure seemed to be doing a little jig, back and forth. that's two fields of motion, right there.

hope this helps.

[Radixmind]

sorry. forgot to tie this up to INTERLACING.
INTERLACING is what this process of putting two FILEDS into one FRAME of video is called. therefore, DEINTERLACING is all about removing one FIELD so the video will look better on a computer. the end result tends to look worse on a TV though.

[jimmalenko]

http://www.digitalfaq.com/dvdguides/capture/understandsource.htm#interlace

[Shifty268]

So just a bit of understanding.

-If you have interlaced video and play it through power DVD does Power DVD de-interlace it for you. Also when playing interlaced video through a tv does it de-interlace it for you?

-If you render a video and de-interlace it when rendering. Does that mean the de-interlacing been done while rendering and it's allways going to be de-interlaced?

-Why do people have interlaced video, is it better quality frames having 2 fields been weaved into one frame?

-To watch a interlaced video through a program does the program have to suppor a de-interlacing filter. ie thats why my video didn't work through Windows Medai Player because Windows Media Player doesn't support de-interlacing?

[jimmalenko]

-If you have interlaced video and play it through power DVD does Power DVD de-interlace it for you.

Yes.

Also when playing interlaced video through a tv does it de-interlace it for you?

I'm pretty sure that it's the DVD player that deinterlaces for you.

-If you render a video and de-interlace it when rendering. Does that mean the de-interlacing been done while rendering and it's allways going to be de-interlaced?

Rendering is a nothing term. It's called encoding, but some software developers want to jazz it up a bit. Rendering is computer-generated animation. But yes, if you deinterlace when encoding, then the output file is always deinterlaced.

-To watch a interlaced video through a program does the program have to suppor a de-interlacing filter. ie thats why my video didn't work through Windows Medai Player because Windows Media Player doesn't support de-interlacing?

Yes. Smart playback software will recognise that the footage is interlaced and deinterlace for you. PowerDVD is smart software - WMP is not.