What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

Back to Search

ffmpeg.org

https://ffmpeg.org· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

ffmpeg.org

Mobile

Sponsored

Hosting Provider

Telepoint Ltd

IP Address

79.124.17.100

Server Location

🇧🇬 Sofia, Bulgaria

ASN

AS31083

Organization

Telepoint Ltd

Server

Apache

Nameservers

ns2.avcodec.org.ns1.avcodec.org.ns3.avcodec.org.

Performance

Page Speed

193 KB

9 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

Telepoint Ltd

Technology Stack

5 Technologies Detected

CSS Frameworks

Libraries

Icon Libraries

Web Servers

SEO Analysis

D47/100

ffmpeg.orgffmpeg.org

FFmpeg

No description available for this page.

Title Length6 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

7 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

13 rules

Sponsored

Security Score

86%Very Good

Static / Informational

HTTPS

No WAF

77d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

01.02.2026

Valid Until

02.05.2026

Subject Alternative Names (20)

fate-suite.ffmpeg.orgffbox0-bg.ffmpeg.orgffbox0-bg.mplayerhq.huffmpeg.mplayerhq.huffmpeg.orggit.ffmpeg.orggit.mplayerhq.hulists.ffmpeg.org+12 more

SHA-256 Fingerprint

7C:C7:1A:EE:4C:8A:95:9B:FC:79:5D:B6:D5:BB:86:A3:7B:B4:03:05...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

connection

content-encoding

📦 Gzip(gzip)

content-length

28906

content-type

text/html

date

Fri, 13 Feb 2026 07:37:47 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

ffbox0-bg.ffmpeg.org

Domain Information

ffmpeg.org

Domain Age

23y 9m

Created

26.04.2002

Expires

26.04.2026

Last Updated

10.06.2025

Registrar

OVH sas

DNSSEC

Not Enabled

Typography & Readability

Lucida Grande

80/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

25/25

2.57x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Lucida Grande

Sans36px

Body Font

Lucida Grande

Sans14px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

36px

28px

24px

18px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.6x larger than body text.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

6 Resources

Scripts

Styles

Async

Defer

Top Script Sources

js(2)

Website Identity

Facebook X (Twitter)

Sponsored

Last analyzed: 13 Feb 2026 at 07:37

Historical Analysis & Change Tracking