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Twitching credits when I export from PAL 25 frames DNxHD timeline to NTSC mpeg 2
Hi Everyone
I ‘v e tried everything so you guys are my last resort. I have just changed over from FCP to premiere and I got to say I love it! But I have had some issues, one such issue is exporting my timeline from from PAL to NTSC mpeg 2 for dvd. Now in FCP, when I used to do this I would just make a fresh timeline with the right settings and copy the project over and render it with the new settings. This never gave me any problems. Now apparently in the new premiere you no longer have to do this. So I export it as NTSC 29.97 frames and it does it. As soon as I look at it something is wrong, the text is twitching! never seen that before ever. So then I just dragged my export to FCP changing the format from DNxHD to pro ress 4444 and did it the old fashioned way, via FCP. The same thing happened! Everything is fine in the PAL versions. Any ideas -
1 Reply
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Text scrolls are a bit tricky; they have to be done at precise speeds so that the rate of motion coordinate with the frame rate. If you move a whole number of pixels from one frame to the next, the text will remain clear. If you move a fractional number of pixels from one frame to the next, then the text will jitter. Since you’re changing the frame rate but not changing the duration, your smooth PAL roll jitters in NTSC.
You can recreate the credit roll specifically for NTSC from scratch. See my post with an expression for smooth credit rolls in Ae [link].
Here’s another approach: make an NTSC sequence and drop the PAL sequence into it. In the NTSC sequence, I’d blade it at the end of the movie where the credit roll begins. Right-click the credit roll clip and change the Speed/Duration to 119.88% (29.97/25). This will speed up the clip so that 1 PAL frame becomes 1 NTSC frame. The roll will run faster, but if it was smooth in PAL, it should now be smooth in NTSC.
If you have a PAL version already exported, you duplicate the PAL clip in your project panel, right-click, Modify > Interpret Footage and change the frame rate from 25 to 29.97. This does the same thing as above — uses 1 PAL frame as 1 NTSC frame, shortening its duration and increasing its apparent rate of speed, but avoid the frame blending and preserving the smoothness of the roll.
Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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