The footage was shot on AG-AF100. The SD card was copied into a camera archive folder. Then in Premiere I used Media Browser to pull the contents into Premiere and I made a bunch of selects and a rough cut, which I then "Replaced with After Effects Composition." Made the mograph. Happy client. Archived project.
Now it's a year later.
Client needs updates to the exact same AE Comp. Pulled the project to the media drive, but the files from the AVCHD contents folder are not recognized. And when I navigate to the folder it is an unopenable AVCHD, cannot right-click and show contents.
This can be irritating in Premiere and even more problematic in After Effects.
This is what I do for each.
Most recent versions of Premiere seem to handle it better but in previous versions, when you open the 'link media' dialogue box and after you click 'locate', you can locate the MTS file in finder (I assume it's roughly the same in windows explorer) and right click the AVCHD file > 'Show Package contents' > Right click on BDMV file > 'Show package contents' again > navigate to 'Stream' folder and with Premiere in the background, so you can see both it and the finder window, drag the Stream folder into the locate box.
In After Effects I drag in the files again and, with the offline media selected in the comp, hold down option (or alt) and drag the newly imported footage into the comp. It replaces the offline footage in the comp with the exact same effects, position, timing etc.
There must be a better way and it would be a pain if this involved many files but this works for me most of the time.