2026-05-18-19-41-29 修复样例视频浏览器显示

frontend/app.js

@@ -77,7 +77,14 @@ function renderPreview(file) {
   imagePreview.hidden = true;
   openSourceButton.hidden = false;
   if (file.type.startsWith("video/")) {
+    videoPreview.preload = "metadata";
+    videoPreview.onloadedmetadata = () => {
+      if (Number.isFinite(videoPreview.duration) && videoPreview.duration > 0.2) {
+        videoPreview.currentTime = 0.1;
+      }
+    };
     videoPreview.src = currentObjectUrl;
+    videoPreview.load();
     videoPreview.hidden = false;
     openSourceButton.textContent = "放大查看";
     sourcePaneTitle.textContent = "查看原始视频";
@@ -280,7 +287,14 @@ openSourceButton.addEventListener("click", () => {
   sourceVideo.hidden = true;
   sourceImage.hidden = true;
   if (selectedFile.type.startsWith("video/")) {
+    sourceVideo.preload = "metadata";
+    sourceVideo.onloadedmetadata = () => {
+      if (Number.isFinite(sourceVideo.duration) && sourceVideo.duration > 0.2) {
+        sourceVideo.currentTime = 0.1;
+      }
+    };
     sourceVideo.src = currentObjectUrl;
+    sourceVideo.load();
     sourceVideo.hidden = false;
   } else {
     sourceImage.src = currentObjectUrl;