fix: trace video normal mode — remove -an to preserve audio

src/api/media_api.rs

@@ -328,7 +328,7 @@ async fn trace_video(
         let tmp_str = tmp.to_str().unwrap_or("").to_string();
         let result = ffmpeg_cmd()
             .args(["-ss", &seek.to_string(), "-i", &video_path, "-t", &duration.to_string(),
-                   "-c", "copy", "-an", "-y", &tmp_str])
+                   "-c", "copy", "-y", &tmp_str])
             .output()
             .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
         if !result.status.success() {