To create the master list of shots, the video was segmented. The results of this pass are called subshots. Because the master shot reference is designed for use in manual assessment, a second pass over the segmentation was made to create the master shots of at least 2 seconds in length. These master shots are the ones to be used in submitting results for the feature and search tasks. In the second pass, starting at the beginning of each file, the subshots were aggregated, if necessary, until the currrent shot was at least 2 seconds in duration, at which point the aggregation began anew with the next subshot.

The emphasis in the common shot boundary reference will be on the shots, not the transitions. The shots are contiguous. There are no gaps between them. They do not overlap. The media time format is based on the Gregorian day time (ISO 8601) norm. Fractions are defined by counting pre-specified fractions of a second. In our case, the frame rate was 25fps. One fraction of a second is thus specified as "PT1001N30000F".

The video id has the format of "XXX" and shot id "shotXXX_YYY". The "XXX" is the sequence number of video onto which the video file name is mapped, this will be listed in the "collection.xml" file. The "YYY" is the sequence number of the shot.

The common shot boundary directory will contain these file(type)s:

• 1_devel_mp7.zip and 1_test_mp7.zip - bundles containing one file of shot information for each video file in the development and /test collections
• xxx.mp7.xml - master shot list for video with id "xxx" in collection.xml
• collection.xml - a list of the files in the collection
• time.elements - info on the meaning/format of the MPEG-7 MediaTimePoint and MediaDuration elements