External helpers

• jhead: to obtain EXIF information.

• identify: to obtain width/height information.

• convert: to scale images to medium and thumbnail formats.

• jhead/jpegtran: for lossless rotation of images.

• mencoder: to convert movie clips to standard MPEG format (optionally, with rotation).

• mplayer: to extract still images from MPEG, and audio from sound clips.

• shellrun.exe: to auto-run a CD based album on (older) Windows.