video_process command to handle timelapse videos

Author: caglarpir

mapillary_tools/sample_video.py

@@ -354,7 +354,14 @@ def _sample_single_video_by_distance(
                 f"interpolated time {interp.time} should match the video sample time {video_sample.exact_composition_time}"
             )
 
-            timestamp = start_time + datetime.timedelta(seconds=interp.time)
+            # Try to use GPS epoch time if available (for timelapse videos)
+            gps_epoch_time = interp.get_gps_epoch_time()
+            if gps_epoch_time is not None:
+                timestamp = datetime.datetime.fromtimestamp(
+                    gps_epoch_time, tz=datetime.timezone.utc
+                )
+            else:
+                timestamp = start_time + datetime.timedelta(seconds=interp.time)
             exif_edit = ExifEdit(sample_paths[0])
             exif_edit.add_date_time_original(timestamp)
             exif_edit.add_gps_datetime(timestamp)