I did a testfile.
I exported a clip (30fps) to png sequence (60fps) and add it to the media encoder and when I press the button "match source" Media Encoder shows me (again) 23,976fps, but when I manually put it on 30fps it really export with 30fps. So I have a mp4 with 30fps
So I import that mp4 to AE its 03:29, when I import the pngs itself directly to AE its 03:29. So my setting seems to be correct. I choose the same settings importing RAW DNG.
I recognize that Media Encoder doesn`t recognize that the RAW DNG is a picture sequence, in the import window the "import sequenze square" is grey out, but it imports it as a the picture sequence, but not with the correct fps.
Its confusing, because it shows in the the clip info, after rendering the correct fps (30fps), but its not 30fps , its more like 23,976 frames. So it really looks that its a adobe software error.
Sorry guys, I found it in an old cs5 Media Encoder Thread:
After Import it to AME I have to right click on the file name and "interpretate footge" and here I can set it to 30fps.
Thanks myself for using the search function
Wow! I thought that was a bug - not being able to import RAW DNG into After Effects, or maybe it was Cinema dng, or specifically maybe it is just Blackmagic cinema dng sequence.
So, good for you. Maybe your approach is a work around for the above mentioned bug.