Actually you’re talking about two different things. In HDLog, offloading is meant as a backup utility to copy the entire card’s contents for archive purposes, or to disk in preparation for editing, etc.
When you open a P2 card (volume) in HDLog, the camera “marked” clips are designated. This open view is similar to the Log and Transfer in FCP–you’re looking at the raw video through a QT conversion on the fly. The full QT files have not yet been made.
So, opening a P2 card, you can choose Export to FCP XML and select all “Marked” in that dialog. This will push just those clips from the card onto disk in QT format. Alternatively, you can select to send FCP just the QT Reference files (aliases) which are just links to the MXF. Doing this will require you to later do a full import inside FCP (since you haven’t yet made the full QT files).
In the FCP XML export inside HDLog, you may also choose how to name the resulting QT files. For example, you can name your clips in the P2 User Clip Name field any way you wish, then in the export selet that field as the Movie name field (upper right in the export dialog). After the files are transferred to disk, HDLog renames them to the text contained in the User Name field for each clip.
Hope this helps.
Video logging is just the beginning…