11

scripts/nodejs/cover_generate.js

@@ -37,19 +37,63 @@ function escapeDrawtext(text) {
     .replace(/%/g, "\\%");
 }
 
+/** ffmpeg drawtext 路径转义（Windows 盘符冒号） */
+function escapeFfmpegPath(filePath) {
+  return String(filePath).replace(/\\/g, "/").replace(/:/g, "\\:");
+}
+
+/**
+ * 定位系统中文字体（ffmpeg drawtext 必须指定 fontfile）
+ */
+function locateCjkFontFile() {
+  const scriptsDir = process.env.AICLIENT_COVER_SCRIPTS_DIR || "";
+  const windir = process.env.WINDIR || "C:\\Windows";
+  const candidates = [
+    path.join(scriptsDir, "fonts", "simhei.ttf"),
+    path.join(scriptsDir, "fonts", "msyh.ttc"),
+    path.join(windir, "Fonts", "simhei.ttf"),
+    path.join(windir, "Fonts", "msyh.ttc"),
+    path.join(windir, "Fonts", "simsun.ttc"),
+    "C:/Windows/Fonts/simhei.ttf",
+    "C:/Windows/Fonts/msyh.ttc",
+  ];
+  for (const p of candidates) {
+    if (p && fs.existsSync(p)) return p;
+  }
+  return null;
+}
+
 function buildTextPosition(titlePosition) {
   if (titlePosition === "top") return "y=50";
   if (titlePosition === "center") return "y=(h-text_h)/2";
   return "y=h-text_h-50";
 }
 
-function runFfmpegCover({ sourceVideo, titleText, effectStyle, coverPath, tempFramePath, emit }) {
+const IMAGE_EXT = new Set([".jpg", ".jpeg", ".png", ".bmp", ".webp"]);
+
+function isImagePath(filePath) {
+  return IMAGE_EXT.has(path.extname(String(filePath || "")).toLowerCase());
+}
+
+function prepareFrameFromSource(sourcePath, tempFramePath, emit) {
+  if (isImagePath(sourcePath)) {
+    emit?.("正在加载图片素材…");
+    execFfmpeg([
+      "-i",
+      sourcePath,
+      "-vf",
+      "scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:color=black",
+      "-y",
+      tempFramePath,
+    ]);
+    return;
+  }
   emit?.("正在提取视频帧…");
   execFfmpeg([
     "-ss",
     "00:00:03",
     "-i",
-    sourceVideo,
+    sourcePath,
     "-vframes",
     "1",
     "-pix_fmt",
@@ -63,16 +107,41 @@ function runFfmpegCover({ sourceVideo, titleText, effectStyle, coverPath, tempFr
     "-y",
     tempFramePath,
   ]);
+}
+
+function runFfmpegCover({ sourceVideo, titleText, effectStyle, coverPath, tempFramePath, emit }) {
+  prepareFrameFromSource(sourceVideo, tempFramePath, emit);
 
   const titleFontSize = effectStyle.titleFontSize ?? 90;
   const titleFontColor = effectStyle.titleFontColor || "#FFFFFF";
   const titlePosition = effectStyle.titlePosition || "bottom";
   const textPos = buildTextPosition(titlePosition);
-  const escaped = escapeDrawtext(titleText);
-  const vf = `drawtext=text='${escaped}':fontsize=${titleFontSize}:fontcolor=${titleFontColor}:x=(w-text_w)/2:${textPos}:shadowcolor=black:shadowx=2:shadowy=2`;
+
+  const fontFile = locateCjkFontFile();
+  if (!fontFile) {
+    throw new Error("未找到中文字体文件，无法使用 ffmpeg 绘制标题（请确认 C:\\Windows\\Fonts\\simhei.ttf 存在）");
+  }
+
+  const titleFilePath = path.join(
+    OUTPUT_DIR,
+    `cover_title_${Date.now()}.txt`,
+  );
+  fs.writeFileSync(titleFilePath, String(titleText), { encoding: "utf8" });
+
+  const fontOpt = `fontfile='${escapeFfmpegPath(fontFile)}'`;
+  const textOpt = `textfile='${escapeFfmpegPath(titleFilePath)}'`;
+  const vf = `drawtext=${fontOpt}:${textOpt}:fontsize=${titleFontSize}:fontcolor=${titleFontColor}:x=(w-text_w)/2:${textPos}:shadowcolor=black:shadowx=2:shadowy=2`;
 
   emit?.("正在叠加标题文字（ffmpeg）…");
-  execFfmpeg(["-i", tempFramePath, "-vf", vf, "-y", coverPath]);
+  try {
+    execFfmpeg(["-i", tempFramePath, "-vf", vf, "-y", coverPath]);
+  } finally {
+    try {
+      fs.unlinkSync(titleFilePath);
+    } catch {
+      /* ignore */
+    }
+  }
 }
 
 function shouldUsePilCover(effectStyle) {