I use Adobe Premiere Elements 12 under Windows 8.1. I have 14 MP4 clips that I cut, join and add transition effects... Something simple.
All the 14 clips are MP4s of the same resolution (640*480), 11 are at 15 fps and 3 are 10 fps. The total running time is around 3h20m.
I want to export the project in 4:3 480p (640*480) at 29.97 fps in MP4. I put all the quality settings at maximum (the export take 6+ hours on a brand new high-end system) but the result is always bad. I see a "jumping" white line at the top of the video. The "animation" is smooth but the details are jumpy.
I found out that if I export in 15 fps instead of 29.97 the movie is OK when it's playing the parts of the 11 clips that the source are 15 fps but the parts of the 3 clips at 10 fps have the jumping problem. It seems the problem originate in the fps upgrade.
In the past I exported this project at 29.97 fps without any problem but at that time the 3 10 fps clips were not integrated.
How can I have an output that is not jumpy?