Aescripts marker-batch-editor v2.0 Free Download
Batch edit all the marker attributes on comp markers or markes on all the selected layers. You can also delete and time-shift markers. It works within the comp work area so you can use the work area to define which markers you want to work with.
New: Now support comp markers and marker duration. If no layers are selected it will edit the comp markers.
You can export the markers to a text file formatted any way you choose.