More interlacing confusion FCP to Vegas to FCP

gwailo wrote on 5/10/2010, 10:34 PM

I have read many posts on interlacing in this forum, and after a lot of trial and error I still can't seem to produce a video that doesn't have problems transferring to digibeta tape.

Here's my situation:

Source footage: DV PAL - Quicktime - Lower Field First - Captured in FCP

Project settings: DV PAL - Lower Field First

Whenever the footage is combined with graphics (progressive) and rendered directly to a final qucktime master (LFF) in one step the graphics will flicker.

If I render out the graphics seperately as a progressive DV PAL AVI file.
Then render out the video as a DV PAL AVI file (LFF) and combine the 2 files together I can render out a Quicktime uncompressed mov file in LFF that does not have graphic flicker.

Using FCP to layback this master file to Digibeta tape produces video jitter (reverse field order problems)

I know Digibeta is UFF. I know DV is LFF. I know I should keep everything in the same field order.

So what am I supposed to do?

Whenever I have DV footage I have to create a blurry progressive *.mov file, in order to lay it back to digibeta tape?

Or is there some missing step that should be taken between placing the Vegas created LFF Quicktime file into the FCP timeline for Digibeta layback?

Comments

musicvid10 wrote on 5/10/2010, 10:50 PM

Try changing the field order in the Vegas media (not project) properties.
Sorry you missed the previous posts on this bug.

http://www.sonycreativesoftware.com/forums/ShowMessage.asp?ForumID=4&MessageID=706402

gwailo wrote on 5/11/2010, 1:38 AM

so quicktime files that are LFF get reported as UFF when they get imported into vegas.

What about UFF quicktime files when they get imported into vegas. Do they show up as LFF?

Is there a 3rd party program which can identify and verify what the field order actually is? I can't seem to find any info on field order in quicktime pro.

altarvic wrote on 5/11/2010, 2:38 AM

May be this will help you?

gwailo wrote on 5/15/2010, 2:16 PM

yep vegas 32 was detecting the wrong field order.

Strangely enough I opened that same project in Vegas 64, and I thought I hit a new bug in the 64 version because all my fields on the quicktime media were suddenly reading the opposite of what it was in 32.

So I guess in Vegas 64 this field order bug doesn't exist.

farss wrote on 5/15/2010, 4:09 PM

1) Many years ago I rescued a Vegas project for another PAL user. His concert video had been cut as 5 reels in FCP. Of the 5 QT files given to him to master a DVD from three were seen by Vegas as the wrong field order. This wasn't discovered until after the DVDs were on sale.

2) It's quite easy to check field order without a CRT yourself. Change project frame rate to double, in your case 50fps. Set project field order to None and look at a shot with fast vertical motion frame by frame

3) I've had ongoing issues with Vegas, DB and field order. Capture and render with Vegas and somehow field order can be swapped in the middle of a shot. This is from second generation masters from the BBC. Render the same captured files with Ppro, no such problem. Capture the same tape with Ppro, and render with Vegas no such problem. I suspect capture with BMD's capture utility, no such problem. I've hounded SCS over this, sent them a DVD that clearly shows the problem. They've acknowledged the problem. That was around 4 years ago.

4) High res graphics and stills can create line twitter on interlaced displays. The cure is to slightly reduce vertical resolution. This is a problem with any NLE.

Bob.