All constants are in config

src/river_annotation_tool/video_loader.py

@@ -6,10 +6,17 @@ from pathlib import Path
 import cv2
 
 
-def load_frames(zip_path: Path, max_frames: int, display_max: int, fps_fallback: int):
-    video_bytes = zipfile.ZipFile(zip_path).read("left.mp4")
+def load_frames(
+    zip_path: Path,
+    max_frames: int,
+    display_max: int,
+    fps_fallback: int,
+    video_in_zip: str = "left.mp4",
+    video_tmp_suffix: str = ".mp4",
+):
+    video_bytes = zipfile.ZipFile(zip_path).read(video_in_zip)
 
-    with tempfile.NamedTemporaryFile(suffix=".mp4", delete=False) as f:
+    with tempfile.NamedTemporaryFile(suffix=video_tmp_suffix, delete=False) as f:
         f.write(video_bytes)
         tmp_path = f.name