added checkbox to ensure width and height are divisible by 2

src/video2x.yaml

@@ -1,7 +1,7 @@
 # Name: Video2X Configuration File
 # Creator: K4YT3X
 # Date Created: October 23, 2018
-# Last Modified: May 12, 2020
+# Last Modified: May 14, 2020
 # Values here are the default values. Change the value here to
 #   save the default value permanently.
 # Items commented out are parameters irrelevant to this context
@@ -122,6 +122,7 @@ ffmpeg:
       '-pix_fmt': 'yuv444p10le' # overwrite default pixel format
       '-crf': 17 # H.264 Constant Rate Factor
       '-b:v': null # target average bitrate
+      '-vf': 'pad=ceil(iw/2)*2:ceil(ih/2)*2' # ensure output is divisible by 2, recommended for libx264
   # Step 3: Streams Migration
   # migrate audio and subtitle streams from original
   #   video into the upscaled video

src/video2x_gui.py

@@ -362,6 +362,7 @@ class Video2XMainWindow(QMainWindow):
         self.ffmpeg_assemble_video_output_options_pixel_format_line_edit = self.findChild(QLineEdit, 'ffmpegAssembleVideoOutputOptionsPixelFormatLineEdit')
         self.ffmpeg_assemble_video_output_options_crf_spin_box = self.findChild(QSpinBox, 'ffmpegAssembleVideoOutputOptionsCrfSpinBox')
         self.ffmpeg_assemble_video_output_options_bitrate_line_edit = self.findChild(QLineEdit, 'ffmpegAssembleVideoOutputOptionsBitrateLineEdit')
+        self.ffmpeg_assemble_video_output_options_ensure_divisible_check_box = self.findChild(QCheckBox, 'ffmpegAssembleVideoOutputOptionsEnsureDivisibleCheckBox')
         self.ffmpeg_assemble_video_hardware_acceleration_check_box = self.findChild(QCheckBox, 'ffmpegAssembleVideoHardwareAccelerationCheckBox')
 
         # migrate_streams
@@ -649,6 +650,19 @@ class Video2XMainWindow(QMainWindow):
             self.config['ffmpeg']['assemble_video']['output_options']['-b:v'] = self.ffmpeg_assemble_video_output_options_bitrate_line_edit.text()
         else:
             self.config['ffmpeg']['assemble_video']['output_options']['-b:v'] = None
+
+        if self.ffmpeg_assemble_video_output_options_ensure_divisible_check_box.isChecked():
+            # if video filter is enabled and is not empty and is not equal to divisible by two filter
+            # append divisible by two filter to the end of existing filter
+            if ('-vf' in self.config['ffmpeg']['assemble_video']['output_options'] and
+                    len(self.config['ffmpeg']['assemble_video']['output_options']['-vf']) > 0 and
+                    self.config['ffmpeg']['assemble_video']['output_options']['-vf'] != 'pad=ceil(iw/2)*2:ceil(ih/2)*2'):
+                self.config['ffmpeg']['assemble_video']['output_options']['-vf'] += ',pad=ceil(iw/2)*2:ceil(ih/2)*2'
+            else:
+                self.config['ffmpeg']['assemble_video']['output_options']['-vf'] = 'pad=ceil(iw/2)*2:ceil(ih/2)*2'
+        else:
+            self.config['ffmpeg']['assemble_video']['output_options'].pop('-vf', None)
+
         if self.ffmpeg_assemble_video_hardware_acceleration_check_box.isChecked():
             self.config['ffmpeg']['assemble_video']['-hwaccel'] = 'auto'
         else:

src/video2x_gui.pyproject.user

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 4.12.0, 2020-05-14T20:16:43. -->
+<!-- Written by QtCreator 4.12.0, 2020-05-14T22:33:50. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>

src/video2x_gui.ui

@@ -1930,6 +1930,16 @@
                  </item>
                 </layout>
                </item>
+               <item>
+                <widget class="QCheckBox" name="ffmpegAssembleVideoOutputOptionsEnsureDivisibleCheckBox">
+                 <property name="text">
+                  <string>Ensure output width and height are divisible by 2</string>
+                 </property>
+                 <property name="checked">
+                  <bool>true</bool>
+                 </property>
+                </widget>
+               </item>
               </layout>
              </widget>
             </item>