#' @title makeVIDEO
#' @description make video through ffmpeg
#'
#' @param file filename of output video
#' @param path The path of figures, i.e, pngs, to make video
#' @param pattern regular expression pattern to filter figures
#' @param mode must be one of "ultrafast", "slow", "veryslow"
#'
#' @export
makeVIDEO <- function(file = "ffmpeg_%d.avi",
path = ".", pattern = "*.png",
mode = c("ultrafast", "slow", "veryslow")){
mode <- mode[1]
system(sprintf("(for %%i in (%s\\%s) do @echo file '%%i') > list.txt",
gsub("/", "\\\\", path), pattern))
system(sprintf("ffmpeg -safe 0 -f concat -r 2 -i list.txt -c:v libx264 -preset %s -crf 0 %s",
mode, gsub("/", "\\\\", file) ))
file.remove("list.txt") #remove list.txt, return null
}
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