Apple Compressor 2 - Manual (Page 60)

60 Chapter 4 Importing Source Media Files
The Batch table now contains your selected media files, and displays 0 entries in the
Setting column. This means that you have not yet assigned a setting, which means you
have not yet created a job. See Chapter 5, “
Creating, Previewing,
and Modifying Settings ,” on page 61, for information on how to perform this task.
Important: It is strongly recommended that you do not use highly compressed files,
such as MPEG files, as your source files, because this can cause undesirable artifacts in
the encoded video.