fix: fix fps meta changing

Author: boomb0om

DPF/transforms/video_fps_transforms.py

@@ -48,5 +48,8 @@ def _process_filepath(self, data: TransformsFileData) -> TransformsFileData:
             ffmpeg_command = f'ffmpeg -hide_banner -i {filepath} -vf fps={self.fps} {temp_filename} -y'
             subprocess.run(ffmpeg_command, shell=True, capture_output=True, check=True)
             shutil.move(temp_filename, filepath)
+            fps = self.fps
+        else:
+            fps = video_fps
 
-        return TransformsFileData(filepath, {'fps': self.fps})
+        return TransformsFileData(filepath, {'fps': fps})