made all drivers change cwd to binary's parent directory to resolve fnf issues

src/wrappers/anime4kcpp.py

@@ -84,6 +84,10 @@ class WrapperMain:
             height {int} -- output video height
         """
 
+        # change the working directory to the binary's parent directory
+        # so the binary can find shared object files and other files
+        os.chdir(pathlib.Path(self.driver_settings['path']).parent)
+
         # overwrite config file settings
         self.driver_settings['input'] = input_file
         self.driver_settings['output'] = output_file

src/wrappers/realsr_ncnn_vulkan.py

@@ -65,6 +65,10 @@ class WrapperMain:
             ratio {int} -- output video ratio
         """
 
+        # change the working directory to the binary's parent directory
+        # so the binary can find shared object files and other files
+        os.chdir(pathlib.Path(self.driver_settings['path']).parent)
+
         # overwrite config file settings
         self.driver_settings['i'] = input_directory
         self.driver_settings['o'] = output_directory

src/wrappers/srmd_ncnn_vulkan.py

@@ -66,6 +66,10 @@ class WrapperMain:
             ratio {int} -- output video ratio
         """
 
+        # change the working directory to the binary's parent directory
+        # so the binary can find shared object files and other files
+        os.chdir(pathlib.Path(self.driver_settings['path']).parent)
+
         # overwrite config file settings
         self.driver_settings['i'] = input_directory
         self.driver_settings['o'] = output_directory

src/wrappers/waifu2x_caffe.py

@@ -73,6 +73,10 @@ class WrapperMain:
         """ start upscaling process
         """
 
+        # change the working directory to the binary's parent directory
+        # so the binary can find shared object files and other files
+        os.chdir(pathlib.Path(self.driver_settings['path']).parent)
+
         # overwrite config file settings
         self.driver_settings['input_path'] = input_directory
         self.driver_settings['output_path'] = output_directory

src/wrappers/waifu2x_converter_cpp.py

@@ -82,8 +82,8 @@ class WrapperMain:
             threads {int} -- number of threads
         """
 
-        # waifu2x-converter-cpp cannot fine libw2xc.so under Linux
-        # if the working directory is not waifu2x-converter-cpp's directory
+        # change the working directory to the binary's parent directory
+        # so the binary can find shared object files and other files
         os.chdir(pathlib.Path(self.driver_settings['path']).parent)
 
         # overwrite config file settings

src/wrappers/waifu2x_ncnn_vulkan.py

@@ -69,6 +69,10 @@ class WrapperMain:
             ratio {int} -- output video ratio
         """
 
+        # change the working directory to the binary's parent directory
+        # so the binary can find shared object files and other files
+        os.chdir(pathlib.Path(self.driver_settings['path']).parent)
+
         # overwrite config file settings
         self.driver_settings['i'] = input_directory
         self.driver_settings['o'] = output_directory