NAME:
  im2vid
 PURPOSE:   (one line only)
  Convert a sequence of images to a video file
 DESCRIPTION:
 CATEGORY:
  File I/O
 CALLING SEQUENCE:
  im2vid,filepatt,outfile
 INPUTS:
  filepatt - String with a file search pattern that will pick up the files
                you want.  These files will be loaded in the sorted order.
                Valid file formats are checked with QUERY_IMAGE
  outfile  - Name of output video file.  The file type is determined from
                the file name.  Valid options are .mp4 and .avi and are
                dictated by IDLffVdeoWrite.
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  FRAME_RATE - Number of frames per second to display.  (default=15)
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2012/07/30