diff --git a/composables/useVideoSubtitleEmbedding.ts b/composables/useVideoSubtitleEmbedding.ts
index 26be3c2..d1f0d5f 100644
--- a/composables/useVideoSubtitleEmbedding.ts
+++ b/composables/useVideoSubtitleEmbedding.ts
@@ -39,10 +39,9 @@ export const useVideoSubtitleEmbedding = async (
     };
   }
 
-  const videoSprite = new OffscreenSprite(
-    new MP4Clip((await fetch(videoUrl)).body!)
-  );
-  videoSprite.time = { duration: 10e6, offset: 0 };
+  const videoClip = new MP4Clip((await fetch(videoUrl)).body!)
+  const videoSprite = new OffscreenSprite(videoClip)
+  videoSprite.time = { duration: videoClip.meta.duration, offset: 0 }
   await videoSprite.ready;
 
   const srtSprite = new OffscreenSprite(
@@ -62,7 +61,7 @@ export const useVideoSubtitleEmbedding = async (
     })
   );
   await srtSprite.ready;
-  srtSprite.time = { duration: 10e6, offset: 0 };
+  srtSprite.time = { duration: videoClip.meta.duration, offset: 0 }
 
   const combinator = new Combinator({
     width: 1920,