720p.lua was made like a month ago but I forgot to commit it

720p.lua

@@ -0,0 +1,56 @@
+#!/usr/bin/env luajit
+
+local help = [[Usage:
+
+  720p.lua [tune=film] [threads=1]
+
+Converts everything in the local directory to 720p MP4s, placed in
+"./720p-output". (Defaults to using only a single thread to reduce impact on
+the system.)
+
+[tune]:    Improve encoding by specifying type of video. "film" is the default.
+           Can be "grain" for grainy sources, "animation", or "stillimage".
+[threads]: Number of threads ffmpeg will be assigned.
+           If a non-number value, ffmpeg's -threads flag will not be used.
+]]
+
+if arg[1] and arg[1]:find("help") then
+  print(help)
+  return false
+end
+
+local error_occurred, utility = pcall(function() return dofile(arg[0]:match("@?(.*/)") or arg[0]:match("@?(.*\\)") .. "utility-functions.lua") end) if not error_occurred then error("\n\nThis script is installed improperly. Follow instructions at:\n\thttps://github.com/TangentFoxy/.lua-files#installation\n") end
+utility.required_program("ffmpeg")
+
+local tune
+if arg[2] then
+  tune = arg[1]
+  arg[1] = arg[2]
+end
+local threads = tonumber(arg[1]) or arg[1] or 1
+
+local tunes = { "film", "grain", "animation", "stillimage", }
+local valid_tune = false
+for _, tune_option in ipairs(tunes) do
+  if tune == tune_option then
+    valid_tune = true
+    break
+  end
+end
+if not valid_tune then
+  tune = "film"
+end
+
+local for_files = utility.ls()
+os.execute("mkdir 720p-output")
+
+for_files(function(file_name)
+  local command
+  if type(threads) == "number" then
+    command = "ffmpeg -threads " .. threads .. " -i \"" .. file_name .. "\" -vf scale=1280:-2 -threads " .. threads .. " -tune " .. tune .. " -crf 28 \"720p-output/" .. file_name .. ".mp4\""
+  else
+    command = "ffmpeg -i \"" .. file_name .. "\" -vf scale=1280:-2 -tune " .. tune .. " -crf 28 \"720p-output/" .. file_name .. ".mp4\""
+  end
+
+  os.execute(command)
+end)