Files
SnapOtter/tests/integration/change-fps.test.ts
T

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TypeScript

import { spawnSync } from "node:child_process";
import { mkdtempSync, readFileSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { ffmpegAvailable } from "@snapotter/media-engine";
import { afterAll, beforeAll, describe, expect, it } from "vitest";
import { buildTestApp, createMultipartPayload, loginAsAdmin, type TestApp } from "./test-server.js";
const MP4 = readFileSync(join(__dirname, "..", "fixtures", "media", "tiny.mp4"));
const WEBM = readFileSync(join(__dirname, "..", "fixtures", "media", "tiny.webm"));
let testApp: TestApp;
let adminToken: string;
beforeAll(async () => {
testApp = await buildTestApp();
adminToken = await loginAsAdmin(testApp.app);
}, 30_000);
afterAll(async () => {
await testApp.cleanup();
}, 10_000);
async function runTool(
settings: Record<string, unknown>,
file: { filename: string; contentType: string; content: Buffer } = {
filename: "tiny.mp4",
contentType: "video/mp4",
content: MP4,
},
) {
const { body, contentType } = createMultipartPayload([
{ name: "file", filename: file.filename, contentType: file.contentType, content: file.content },
{ name: "settings", content: JSON.stringify(settings) },
]);
return testApp.app.inject({
method: "POST",
url: "/api/v1/tools/video/change-fps",
headers: { authorization: `Bearer ${adminToken}`, "content-type": contentType },
body,
});
}
describe.skipIf(!ffmpegAvailable())("change-fps (requires ffmpeg)", () => {
it("changes to 10 fps and verifies via ffprobe", async () => {
const res = await runTool({ fps: 10 });
expect(res.statusCode).toBe(200);
const envelope = JSON.parse(res.body);
expect(envelope.downloadUrl).toBeDefined();
const dl = await testApp.app.inject({ method: "GET", url: envelope.downloadUrl });
expect(dl.statusCode).toBe(200);
expect(dl.rawPayload.length).toBeGreaterThan(100);
// Write to tmp and probe frame rate directly via ffprobe spawnSync
const tmpDir = mkdtempSync(join(tmpdir(), "fps-test-"));
const probeFile = join(tmpDir, "fps.mp4");
writeFileSync(probeFile, dl.rawPayload);
const result = spawnSync("ffprobe", [
"-v",
"error",
"-select_streams",
"v:0",
"-show_entries",
"stream=r_frame_rate",
"-of",
"csv=p=0",
probeFile,
]);
const fps = result.stdout.toString().trim();
expect(fps).toBe("10/1");
}, 60_000);
it("changes fps on a webm input and keeps a webm-legal codec (regression: h264-in-webm exit 234)", async () => {
const res = await runTool(
{ fps: 1 },
{ filename: "tiny.webm", contentType: "video/webm", content: WEBM },
);
expect(res.statusCode).toBe(200);
const envelope = JSON.parse(res.body);
expect(envelope.downloadUrl).toBeDefined();
const dl = await testApp.app.inject({ method: "GET", url: envelope.downloadUrl });
expect(dl.statusCode).toBe(200);
expect(dl.rawPayload.length).toBeGreaterThan(100);
// Output must be a valid webm with a webm-legal video codec (vp9/vp8/av1),
// never h264 -- which cannot be muxed into a webm container.
const tmpDir = mkdtempSync(join(tmpdir(), "fps-webm-test-"));
const probeFile = join(tmpDir, "out.webm");
writeFileSync(probeFile, dl.rawPayload);
const result = spawnSync("ffprobe", [
"-v",
"error",
"-select_streams",
"v:0",
"-show_entries",
"stream=codec_name",
"-of",
"csv=p=0",
probeFile,
]);
const codec = result.stdout.toString().trim();
expect(["vp9", "vp8", "av1"]).toContain(codec);
}, 60_000);
});