fix(cli): align video output boundaries (#2490)

* fix(cli): align video output boundaries

* test(cli): honor CI ffmpeg fixture path

* test(cli): decouple duration precedence from ffmpeg

* test(cli): pin half-open video boundaries

* test(producer): refresh style 7 boundary golden

packages/cli/src/commands/init.test.ts

@@ -4,7 +4,11 @@ import { existsSync, mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync
 import { tmpdir } from "node:os";
 import { join, resolve } from "node:path";
 import { fileURLToPath } from "node:url";
-import { applyResolutionPreset, injectTailwindBrowserScript } from "./init.js";
+import {
+  applyResolutionPreset,
+  injectTailwindBrowserScript,
+  resolveVideoDurationSeconds,
+} from "./init.js";
 
 const cliEntry = resolve(fileURLToPath(import.meta.url), "..", "..", "cli.ts");
 const tailwindScript =
@@ -177,6 +181,26 @@ describe("hyperframes init flag rename", () => {
     }
   });
 
+  it("uses the video stream duration when audio outlasts the final video frame", () => {
+    expect(
+      resolveVideoDurationSeconds({
+        streamDuration: 1,
+        frameDuration: 1,
+        formatDuration: 1.2,
+      }),
+    ).toBe(1);
+  });
+
+  it("falls through unusable stream durations before using the container duration", () => {
+    expect(
+      resolveVideoDurationSeconds({
+        streamDuration: 0,
+        frameDuration: Number.NaN,
+        formatDuration: 1.2,
+      }),
+    ).toBe(1.2);
+  });
+
   it("--audio with a missing file fails without creating the project directory", () => {
     const dir = mkdtempSync(join(tmpdir(), "hf-init-test-"));
     const target = join(dir, "proj");