Add counterrotating preview images of videos rotated based on metadata

Based on a proposal by HerMajestyDrMona reported as
#16

Author: hhtznr

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pyvideothumbnailer"
-version = "2.0.4"
+version = "2.1.0"
 authors = [
   { name="Harald Hetzner", email="57875126+hhtznr@users.noreply.github.com" },
 ]

src/pyvideothumbnailer/videothumbnailer.py

@@ -40,7 +40,7 @@
 
 __author__ = 'Harald Hetzner'
 __license__ = 'BSD 3-Clause License'
-__version__ = '2.0.4'
+__version__ = '2.1.0'
 
 class Parameters:
     """
@@ -752,6 +752,17 @@ def create_preview_thumbnails_for(self, file_path: Path) -> Image:
         video_width = int(video_metadata['width'])
         # Height in px
         video_height = int(video_metadata['height'])
+        # Rotation in °
+        video_rotation = 0
+        if 'rotation' in video_metadata.keys():
+            video_rotation = int(float(video_metadata['rotation']))
+            if self.parameters.verbose:
+                print('Video images are rotated by {}° according to metadata.'.format(video_rotation))
+        # Swap width and height if the video is rotated by 90° or 270°
+        if video_rotation in (90, 270):
+            temp = video_width
+            video_width = video_height
+            video_height = temp
         # Aspect ratio
         video_aspect = float(video_width) / float(video_height)
         # Frames per second
@@ -959,7 +970,11 @@ def create_preview_thumbnails_for(self, file_path: Path) -> Image:
                         # pts = presentation timestamp in time_base units
                         if frame.pts >= target_timestamp:
                             # VideoFrame.to_image() returns a PIL image
-                            image = frame.to_image().resize((thumbnail_width, thumbnail_height))
+                            image = frame.to_image()
+                            # Counterrotate the image if the video is rotated by multiples of 90° according to metadata
+                            if video_rotation in (90, 180, 270):
+                                image = image.rotate(-video_rotation, expand=True)
+                            image = image.resize((thumbnail_width, thumbnail_height))
                             thumbnails_image.paste(image, box=(x, y))
                             frame_captured = True
                             break