Seeing interlaced lines on cross fade

Hi, I'm using HD 720p footage taken off a JVC GY-HD100. I'm using the HDV compressor 720p24 in FCP 5.1.2
When I cross fade in my footage, if the Field Dominance is Upper or Lower, I see interlaced horizontal lines appear during the fade and then disappear. If I turn Field Dominance off, I end up seeing interlaced vertical lines during the fade.
Help! How do I get this to go away???
G5 Quad Mac OS X (10.4.7)

How are you viewing your footage?
Remember Viewer and Canvas only show a low resolution proxy image. To fully realize what your video is doing, you need an external reference monitor.
x

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Adding cross fade reveals bit of footage I thought was razored off !

Hi,
Premiere Pro CS3
If I go frame by frame with cursor at the end of my video I see only the footage I expect. Lets call it clip C.
If I add black video at end of my footage and play timeline, I still see nothing extra beyond my video of Clip C, my footage ends abruptly and the black shows, but if I cross fade the junction then play, I see a bit of footage which followed on in the original recording on the camcorder (clip D) but was definitely cut off in this project, if frame by frame is anything to go by !
It certainly doesnt show when scrubbed or played prior to adding the cross fade. If I use Dip to Black instead of Cross fade on that video/blackVideo junction then it fades to black and no unwanted video shows up.
If I replace the black video with a video clip copy pasted from earlier in my sequence and cross fade the joint, then that bit of unwanted video (clip D)shows up again, fading out as the added clip fades in. As such if this was in the middle of my sequence I would be in trouble, but I can use dip to black at the end and not see it. As such though I need to know why I am seeing something not there until cross fade or similar is added.
Whats going on ? How can I be showing something that was razored off ? I never knew that was there prior to adding in the cross dissolve.
I also can see it if I use dither dissolve, and no doubt other transitions.
I have even dragged the cursor and whilst seeing a frame of Clip C, sliced the end off a bit more incase clip D was lurking in the end of my video, that should do the trick, but annoyingly its still there ! Remove the transition and it doesnt show.
Why ?
Envirographics

Hi,
Bill's explanation is correct , and I recently had similar problem with fading in and out, using cs3 and I found I had to do a couple things...
1) zoom all the way in on the timeline to see individual frames. Use "eye" icon to turn on and off tracks so you can see the one you want one at a time when necessary.
2) do the cross dissolve or fades using your own keyframes ...rather than the effect , and move frame by frame using arrow keys and look at program monitor to make sure your keyframes are in the right place NOT to show any footage you dont want.
You could just adjust the keyframes of the effect cross dissolve but I find it easier just to do it manually... and make the dip angle of the transparency line similar to all your fades if you want that similarity... In this sample its fades out and fades in, but if you stack the video you can fade one in as you fade the other out...which I find I have more control over than using the effect...but you can adjust the effect too if you want...
anyway, couple ways you can do it is the bottom line and you need to just scrub thru frame by frame to double check what you really have...and render it first...so its all green....no red in the cross dissolve areas...or you wont see whats really there.... the image shows all manual fades

Should i be able to see interlacing on the computer display?

I'm trying to verify if i have things set up properly.
If i'm working in a timeline that is DV NTSC and i've brought in elements from after effects and as well have moving images within FCP, should i be able to see the interlaced lines in FCP?
It looks okay on the broadcast monitor but i'm trying to figure out if interlacing on ftg/renders should be visible on the cinema display.
a simple yes, no and a sentence if you've got the time would be nice.
thanks

You can observe the presence of interlacing on a computer display only if the Canvas (or Viewer) are set to display 100% size and the video is paused. The interlacing will appear as a comb effect on moving objects. You can not observe interlacing with a computer display on running video.

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PS Hoping I won't have same problem with vid transitions

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Any idea ?
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I have an old TV...which is 4:3. ntsc but dont matter I dont think re: this subject...
I made a DVD that was 16:9 and played it on my old dvd player ...and watched it on old tv. It CROPPED the 16:9 frame !
Playing on my computer it was fine...as I have a flat widescreen...
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My DVD player and tv combo does not have the option to go to a 16:9 format...so it was cropping the frame and was bad news.
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I rendered a portion of my
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<img src="images/beach2.jpg" width="200" height="200" />
<img src="images/beach3.jpg" width="200" height="200" />
<img src="images/beach4.jpg" width="200" height="200" />
<img src="images/beach5.jpg" width="200" height="200" />
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<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>

<script type="text/javascript" src="http://cloud.github.com/downloads/malsup/cycle/jquery.cycle.all.latest.js"></script>
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Seeing interlaced lines on cross fade

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