-
flickering on slowmo with shift fields.
Editing doc in 8 bit uncompressed. Shot on digi beta so upper field has dominance. But using DVCAM also so shifting fields for that. However when slowing down the dvcam footage geeting really bad strobing and field issue anyone any ideas.
Ross
-
4 Replies
-
[Ross Marshall] “Editing doc in 8 bit uncompressed. Shot on digi beta so upper field has dominance.”
In PAL yes. In NTSC, no, Lower Field dominance.
Walter Biscardi, Jr.
Biscardi Creative Media
HD and SD Production for Broadcast and Independent Productions.STOP STARING AND START GRADING WITH APPLE COLOR
The new Color Training DVD now available from the Creative Cow! -
Am in PAL so how do I avoid this
-
Ross, why the PAL world adopted lower field for DV is beyond me. The fix is slightly fiddly but simple.
The slo mos must be made without the shift field filter, so copy the slo mos into a seperate sequence that is set for DV lower field. Remove the shift fields filter. Make QT movies of the slo mo shots. Drop the Qt in to replace (or sit on top of) the original file. The QTs should be in DV codec. FCP will then automatically apply the shift field filter again but the slo mo is “baked in”.
FCP seems to have a bug with shift field media and introduces field errors during slo mos. I think the filter is being applied after the slo mo calculation so the fields are reversed in the slo mo creating jitter.
You could also investigate using Motion to create your slo mos, make a QT and drop that back into your uncompressed timeline.
-
I had the same problem on a PAL doc I was cutting. In that case everything was in DV, so lower field. I exported to Uncompressed PAL for the color grade on Digibeta, so upper field. And got the flickering on the slo-mos. However, the shift field filter fixed most of those errors since the slo-mo had already been rendered. This seems to confirm what Michael said. But some shots jsut wouldn’t be fixed. I was dealing with archival footage that had been transferred through innumerable processes. For a few shots I had to go back to the original lower field shot, de-interlace and export a new upper-field quicktime before doing the slo-mo. That was all in 5.1.4 land when FCP didn’t automatically apply the shift fields filter.
Reply to this Discussion! Login or Sign Up