1 files changed, 50 insertions, 0 deletions
diff --git a/mpv/scripts.other/fpsadjust.lua b/mpv/scripts.other/fpsadjust.lua
new file mode 100644
index 0000000..61065cf
--- /dev/null
+++ b/mpv/scripts.other/fpsadjust.lua
@@ -0,0 +1,50 @@
+require 'mp.options'
+local opt = {
+    maxiters = 5,      -- Frames involving at most this many frames will be
+                       -- considered acceptable.
+
+    maxdelta = 0.01,   -- Maximum allowed speed change (setting this too high
+                       -- could cause noticeable change in pitch and tempo)
+
+    mindelta = 0.0005, -- Minimum speed change that would be considered
+                       -- significant enough to be worth calculating. Any lower
+                       -- and it will just play at 100% speed to preserve CPU
+                       -- cycles.
+}
+read_options(opt)
+
+function get_scale(ratio, factor)
+    scale = ratio * factor / math.floor(ratio * factor + 0.5)
+    delta = math.abs(scale - 1)
+
+    if (delta < opt.mindelta) then
+        return 1   -- close enough, just use it
+    end
+    if (delta > opt.maxdelta) then
+        return nil -- large deviation, skip
+    end
+    return scale   -- decent match found
+end
+
+function adjust_speed(event)
+    clip_fps = mp.get_property_number("fps")
+    disp_fps = mp.get_property_number("display-fps")
+
+    if not clip_fps or not disp_fps or disp_fps == 0 then
+        return
+    end
+
+    for i=1,opt.maxiters do
+        scale = get_scale(disp_fps / clip_fps, i)
+        if scale then
+            break
+        end
+    end
+
+    if scale then
+        mp.set_property("speed", scale)
+        print("Setting speed to", scale)
+    end
+end
+
+mp.register_event("playback-restart", adjust_speed)