If the videofilename specified on the command line contains a * character, all matching files will be treated as a single multi-part video file. These files will be treated as if they were concatenated into a single large file. The duration of this file will be the sum of the durations of the individual files.
Only a single Overview thumbnail page and set of Detail pages will be generated for this multi-part file. This can come in handy when a video file has been arbitrarily split into pieces (normally to fit onto a single CDROM or within the DVD 1GB maximum).
For example, say you have two video files called myvideo-cd1.avi and myvideo-cd2.avi that are really just pieces of the single file myvideo.avi — or you are trying to thumbnails files from a unencrypted DVD title set. Instead of getting multiple Overview pages with the each page restarting at time 0:0:0, if you do:
clatn myvideo-cd*.avi
or:
clatn --outdir . d:\VIDEO_TS\VTS_01_*.VOB
you’ll get just a single Overview page with the timestamps showing the time from the real start. The first thumbnail from each part will have the file number added to its timestamp and be highlighted with a different colored border to make it slightly easier to notice the location of the file splits.
Similarly, there will only be one set of Detail pages for the entire multi-part video. The thumbnail times will indicate both the time from the actual start and the time from each individual file along with the file number. The first thumbnail from each part will again be highlighted with a different colored border. MULTI is also added at the beginning of the detail page filenames to indicate that these Detail pages came from a multi-part video.
See Thumbnail a multi-part video for a detailed example.