xcuse my english

when I export from After Effects or from Camtasia Studio in QuickTime Animation (lossless), the exported movie has only 8 fps, but my source movie has 15 fps

even if I set 15 fps in the properties panel of animation codec, it still outputs it at only 8 fps

How can I fix this ? I need to export from Camtasia Studio in Animation at the same framerate as the source recording.