groovy script to generate a film strip

strip

@Grab( 'commons-io:commons-io:2.1' )
import org.apache.commons.io.FilenameUtils

// filename of video
def filename = this.args[0]

// base of filename
def basename = FilenameUtils.getBaseName(filename)

// width of final strip
def width = this.args.length > 1 ? this.args[1] : 640

// number of desired frames
def count = 8

// calculate the height assuming 16x9 video
def w = width / count
def h = Math.round(w * 9 / 16)

(1..count).each { c -> 
  "ffmpegthumbnailer -i ${filename} -o ${basename}_${c}.jpg -s ${w} -t ${((c-1) / count) * 100}%".execute().waitFor()
}

"convert +append ${basename}_*.jpg ${basename}.jpg".execute().waitFor()
"rm -f ${basename}_*".execute().waitFor()