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I thought I understood fields…
Hi there,
I have imported some uncompressed interlaced PAL DV footage into AE to add a title crawl. The footage is interpreted as separated lower field first.
I have set my comp frame rate to 50fps to display the fields and added my crawl.
In the render settings I have selected render fields lower first with no compresssion and with the frame rate set as 25fps, which is the final PAL output.
Upon playback in my NLE (Edition), I’m still getting a flicker on the footage (although the crawl is perfectly smooth).
I have tried all combinations of separating and rendering upper and lower field first but still no joy. Like I said – I thought I understood fields!
Cheers,
Phil Biggs -
10 Replies
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Hi Phil,
maybe you could check that your footage is lower field first (as indeed it should be). To do this hold down the Option key (mac) or Alt (windows) and double click the footage in the Project window to open the Footage window. Hold down Command (mac) or Control (pc) and use the arrow keys to step through the footage. If the movement moves forward one frame on one click and back on the next click, the fields are incorrectly interpreted. If so, change the interpretation and rerender.JD
John Dickinson
Motionworks
http://www.motionworks.com.au -
If it were me, I’d have the comp set to 25fps and NOT 50fps. Give that a go.
— Wes Plate
Automatic Duck -
Hey Wes,
Setting the comp to 50fps enables you to see both fields as frames in the comp window. Doing this and rendering out to 25fps with fields is a technique I use often when rotoscoping. So I’m not sure if this is the issue…JD
John Dickinson
Motionworks
http://www.motionworks.com.au -
You could surely nest the 50fps comp into a 25fps comp then field render the 25fps comp. I’m just saying if it were me I would be sure that the comp I’m rendering matches exactly the end result I’m seeking (frame rate included).
— Wes Plate
Automatic Duck -
Phil,
Can you explain in more detail the “flicker” you are seeing in the text? If the crawl is fine, I doubt it is a field order issue. Have you tried applying the “Reduce Interlace Flicker” filter to your text?
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There is at least one capture sytem – using the Matrox RTX 100 – which produces PAL DV with reversed fields / upper field first. If you suspect this is the issue, you could render a test second to check …
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Thanks for your help guys,
As John suggested, the captured footage is actually upper field first. It works fine back in Edition when separated as upper first, then rendered out lower first (the last combination I tried)!
Cheers,
PhilOh – John, I’m heading out to Australia from the UK next week to do a bit of travelling. Can you recommend anywhere I could look for some low paid casual graphic design / operating work?
Cheers -
[phil biggs] “Oh – John, I’m heading out to Australia from the UK next week to do a bit of travelling. Can you recommend anywhere I could look for some low paid casual graphic design / operating work?”
Sorry John, thought I’d barge in — Phil, don’t ever ever put “low paid” into such a description of work. If someone was ready to pay you fair rate, you’ve just cut yourself off at the knees for no reason. Just leave “low paid” out. 🙂
Although John would be fair and kind in his referrals. 🙂
my 2 cents,
Steve -
Point taken Steve!
I guess I’ve always been guilty of undercharging for my work – you know – ‘friends rates’ for people who I just met etc. I really need to toughen up in that respect. But, if it came down to picking melons to pay for the youth hostel, or doing some design work for the same money… 😉
Anyway – have Powerbook, will travel.
Cheers guys,
Phil -
Hi Phil,
Glad it worked out. Check out this site https://www.dlf.org.au/. You can subscribe the mailing list (it’s where I found my job). Hope you enjoy your trip down here 🙂best,
JD
John Dickinson
Motionworks
http://www.motionworks.com.au
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