migrate to root dir

lib/pipeline/video.ts

@@ -0,0 +1,74 @@
+import { spawn } from "child_process";
+import { StoryConfig } from "./config";
+import * as path from "path";
+import ffmpeg from "ffmpeg-static";
+
+function escapeForFilter(filePath: string): string {
+  return filePath.replace(/\\/g, "\\\\").replace(/:/g, "\\:").replace(/,/g, "\\,").replace(/'/g, "\\'");
+}
+
+export async function createVideo(
+  storyName: string,
+  storyConfig: StoryConfig,
+  imageFiles: string[],
+  chunkDurations: number[],
+  srtPath: string
+): Promise<void> {
+  const ffmpegPath: string = (ffmpeg as unknown as string) || "ffmpeg";
+  const audioPath = path.resolve("stories", storyName, "final_audio", "final.mp3");
+  const videoPath = path.resolve("stories", storyName, "video", "final.mp4");
+  const totalDuration = chunkDurations.reduce((a, b) => a + b, 0);
+  const resolution = storyConfig.config.export_settings?.resolution || "1024x1024";
+
+  const inputs = imageFiles.map((file) => ["-loop", "1", "-i", file]).flat();
+  inputs.push("-i", audioPath);
+
+  const filterGraph = imageFiles
+    .map((_, i) => {
+      const duration = chunkDurations[i];
+      const zoompan = `zoompan=z='min(zoom+0.0015,1.5)':d=${25 * duration}:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=${resolution}`;
+      return `[${i}:v]${zoompan},fade=t=out:st=${duration - 1}:d=1[v${i}]`;
+    })
+    .join(";");
+
+  const streamSpecifiers = imageFiles.map((_, i) => `[v${i}]`).join("");
+  const escapedSrt = escapeForFilter(srtPath);
+  const concatGraph = `${filterGraph};${streamSpecifiers}concat=n=${imageFiles.length}:v=1:a=0,format=yuv420p[v0]`;
+  const finalFilterGraph = `${concatGraph};[v0]subtitles='${escapedSrt}'[v]`;
+
+  const args = [
+    "-y",
+    ...inputs,
+    "-filter_complex",
+    finalFilterGraph,
+    "-map",
+    "[v]",
+    "-map",
+    `${imageFiles.length}:a`,
+    "-c:v",
+    "libx264",
+    "-tune",
+    "stillimage",
+    "-c:a",
+    "aac",
+    "-b:a",
+    "192k",
+    "-pix_fmt",
+    "yuv420p",
+    "-t",
+    totalDuration.toString(),
+    videoPath,
+  ];
+
+  const ffmpegProcess = spawn(ffmpegPath, args);
+
+  return new Promise<void>((resolve, reject) => {
+    ffmpegProcess.on("close", (code: number | null) => {
+      if (code === 0) {
+        resolve();
+      } else {
+        reject(new Error(`ffmpeg process exited with code ${code}`));
+      }
+    });
+  });
+}