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making_gif.R
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making_gif.R
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###########################################################################################-
###########################################################################################-
##
## Making an example GIF of LGA flight history ----
##
###########################################################################################-
###########################################################################################-
#=========================================================================================#
# Setting up ----
#=========================================================================================#
#-----------------------------------------------------------------------------------------#
# Loading libraries
#-----------------------------------------------------------------------------------------#
library(tidyverse)
library(lubridate)
library(av)
library(gifski)
library(hms)
library(glue)
library(fs)
#-----------------------------------------------------------------------------------------#
# Which dates are we combining?
#-----------------------------------------------------------------------------------------#
video_date_1 <- "2020-03-16" %>% as_date()
video_date_2 <- "2020-04-06" %>% as_date()
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
# What times are we subsetting?
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
start_time_real <- hms(0, 0, 18)
end_time_real <- hms(0, 0, 19)
# 2 frames per minute. First getting number of minutes, then doubling to get frame number
start_frame <- ((hour(start_time_real) * 60) + minute(start_time_real)) * 2
end_frame <- ((hour(end_time_real) * 60) + minute(end_time_real)) * 2
# 30 fps, so frame_number/30 give the nuber of seconds
start_time_video <- start_frame/30
end_time_video <- end_frame/30
video_duration <- end_time_video - start_time_video
"ffmpeg -ss [start] -i in.mp4 -t [duration] -c copy out.mp4"
#-----------------------------------------------------------------------------------------#
# Getting video paths
#-----------------------------------------------------------------------------------------#
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
# Paths
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
video_files <- dir_ls("plots/videos")
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
# Choosing among potential options
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
#==== Video 1 ====#
video_1_choices <-
video_files %>%
str_subset(as.character(video_date_1))
if (length(video_1_choices) > 1) {
video_1 <-
menu(
choices = video_1_choices,
graphics = TRUE,
title = "Which video do you want to use for video_1?"
) %>%
pluck(video_1_choices, .)
} else {
video_1 <- video_1_choices
}
#==== Video 2 ====#
video_2_choices <-
video_files %>%
str_subset(as.character(video_date_2))
if (length(video_2_choices) > 1) {
video_2 <-
menu(
choices = video_2_choices,
graphics = TRUE,
title = "Which video do you want to use for video_2?"
) %>%
pluck(video_2_choices, .)
} else {
video_2 <- video_2_choices
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
# Root of the video name
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
video_name_root <-
video_1 %>%
path_file() %>%
path_ext_remove() %>%
str_remove(as.character(video_date_1))
#=========================================================================================#
# Stacking ----
#=========================================================================================#
video_path <-
glue(
"plots/videos/",
"{video_name_root}-",
"_{video_date_1}_vs._{video_date_2}",
"_{start_time_video}sec-{end_time_video}sec.mp4"
)
system(
glue(
"ffmpeg -hide_banner -y",
"-ss {start_time_video}",
"-i {video_1}",
"-t {video_duration}",
"-ss {start_time_video}",
"-i {video_2}",
"-t {video_duration}",
"-filter_complex hstack=inputs=2",
"-c:v libx265",
"-x265-params range=full:qp=20",
"-pix_fmt yuvj420p",
"{video_path}",
.sep = " "
)
)
#=========================================================================================#
# Converting short video to GIF ----
#=========================================================================================#
#-----------------------------------------------------------------------------------------#
# Reading video as images
#-----------------------------------------------------------------------------------------#
video_images <- av_video_images(video_path, format = "png")
gifski(
png_files = video_images,
gif_file = path_ext_set(video_path, "gif"),
width = 1200,
height = (2300/3200)*1200,
delay = 1/25,
progress = TRUE
)
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# #
# # ---- THIS IS THE END! ----
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