denrou

Convert sequence of JPEG images to MP4 video

ffmpeg -r 24 -pattern_type glob -i '*.JPG' -i DSC_%04d.JPG -s hd1080 -vcodec libx264 timelapse.mp4

• -r 24 - output frame rate
• -pattern_type glob -i '*.JPG' - all JPG files in the current directory
• -i DSC_%04d.JPG - e.g. DSC_0397.JPG
• -s hd1080 - 1920x1080 resolution

Slower, better quality

denrou

shift <- function(x, ..., shifts = 1, suffix = "lag") {
  vars         <- unname(tidyselect::vars_select(names(x), !!!rlang::quos(...)))
  combinations <- expand.grid(var = vars, shift = shifts, stringsAsFactors = FALSE)

  shift_cols <- purrr::pmap_dfc(combinations, function(var, shift) {
    new_var <- glue::glue("lag_{var}_{shift}")
    tibble::tibble(!!new_var := dplyr::lag(x[[var]], shift))
  })
  dplyr::bind_cols(x, shift_cols)
}