From f283a12a0b430e5226d09bb75851f3d3982dec24 Mon Sep 17 00:00:00 2001
From: K4YT3X <k4yt3x@k4yt3x.com>
Date: Tue, 6 Jul 2021 02:19:38 +0000
Subject: [PATCH] fixed another upscaler diff threshold calculation error

---
 video2x/upscaler.py | 31 +++++++++++++++----------------
 video2x/video2x.py  |  4 ++--
 2 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/video2x/upscaler.py b/video2x/upscaler.py
index bd10208..e1ef777 100755
--- a/video2x/upscaler.py
+++ b/video2x/upscaler.py
@@ -74,7 +74,7 @@ class Upscaler(multiprocessing.Process):
                     time.sleep(0.1)
                     continue
 
-                difference_ratio = -1
+                difference_ratio = 0
                 if image0 is not None:
                     difference = ImageChops.difference(image0, image1)
                     difference_stat = ImageStat.Stat(difference)
@@ -85,9 +85,22 @@ class Upscaler(multiprocessing.Process):
                     )
 
                 # if the difference is lower than threshold
-                # process the interpolation
+                # skip this frame
                 if difference_ratio < difference_threshold:
 
+                    # make sure the previous frame has been processed
+                    if frame_index > 0:
+                        while self.processed_frames[frame_index - 1] is None:
+                            time.sleep(0.1)
+
+                    # make the current image the same as the previous result
+                    self.processed_frames[frame_index] = self.processed_frames[
+                        frame_index - 1
+                    ]
+
+                # if the difference is greater than threshold
+                # process this frame
+                else:
                     width, height = image1.size
 
                     # calculate required minimum scale ratio
@@ -149,20 +162,6 @@ class Upscaler(multiprocessing.Process):
                     image1 = image1.resize((output_width, output_height), Image.LANCZOS)
                     self.processed_frames[frame_index] = image1
 
-                # if the difference is greater than threshold
-                # there's a change in camera angle, ignore
-                else:
-
-                    # make sure the previous frame has been processed
-                    if frame_index > 0:
-                        while self.processed_frames[frame_index - 1] is None:
-                            time.sleep(0.1)
-
-                    # make the current image the same as the previous result
-                    self.processed_frames[frame_index] = self.processed_frames[
-                        frame_index - 1
-                    ]
-
             # send exceptions into the client connection pipe
             except (SystemExit, KeyboardInterrupt):
                 break
diff --git a/video2x/video2x.py b/video2x/video2x.py
index f52cbf8..e8fa6da 100755
--- a/video2x/video2x.py
+++ b/video2x/video2x.py
@@ -378,7 +378,7 @@ def parse_arguments() -> argparse.Namespace:
         "-t",
         "--threshold",
         type=float,
-        help="if the % difference between two adjacent frames exceeds this value, two images are deemed the same; 0 is off",
+        help="skip if the % difference between two adjacent frames is below this value; set to 0 to process all frames",
         default=0,
     )
 
@@ -400,7 +400,7 @@ def parse_arguments() -> argparse.Namespace:
         "-t",
         "--threshold",
         type=float,
-        help="if the % difference between two adjacent frames exceeds this value, no interpolation will be performed; 0 is off",
+        help="skip if the % difference between two adjacent frames exceeds this value; set to 100 to interpolate all frames",
         default=10,
     )