Having jumpy playback with 60p footage exported to 30p. Pans are worst.

We recently shot a commercial on the Sony FS700 in the native AVCHD codec at 60p. We originally intended to slow the footage down to 30 but the client decided the natural speed worked better. So we simply cut the spot in a 30p sequence and exported. The playback is VERY jittery/jumpy with any vertical lines in the picture, which is very pronounced in any pans. We then cut it in a 60p timeline and exported 60p then converted to 30p, same issue. I did have frame blend on every export.
Exporting 60i does help tremendously, some stations won't accept the 60i file however which sticks us with 30p files which have the issue. The XDCAM 1080 60i file is perfect, however ProRes 30p is not.
Any ideas on this?

Believe it or not, the Import method can sometimes affect playback. Be sure to copy the entire AVCHD folder structure over from SD card to hard drive, unmodified, then in Premiere use the "Media Browser" to import your clips for best results. A definite plus for any spanned clips for sure, also helps with some audio issues.
Also, my understanding of the Interpret Footage option was that if you put 60p footage into a 30p sequence, and also used "Interpret As 29.97" then the footage ought to be playing back at 50% slow motion speed. Something seems off here.
EDIT: Or maybe that's what you meant, the slowmo is perfect?
Jeff Pulera
Safe Harbor Computers

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Having jumpy playback with 60p footage exported to 30p. Pans are worst.

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