diff --git a/app/main.py b/app/main.py
index 34278f1..88ac19b 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1291,7 +1291,7 @@ async def preview_clip(
             "-i", str(src),
             "-ss", f"{min(0.5, start):.2f}",  # fine seek
             "-t", f"{duration:.2f}",
-            "-vf", "scale=854:480:force_original_aspect_ratio=decrease",  # 480p
+            "-vf", "scale=854:480:force_original_aspect_ratio=decrease,scale=trunc(iw/2)*2:trunc(ih/2)*2",  # 480p, even dimensions for libx264
             "-c:v", "libx264",
             "-preset", "ultrafast",  # NAJHITREJŠI preset
             "-crf", "30",  # nižja kvaliteta = hitrejše