Accessibility
· 13 checks — Landmarks, headings, alt text, forms, and link quality rolled into one auditable list.DLink & Button QualityAction9 issue(s) across 136 links and 0 buttonsFIX
| Element | Text | Issue | Suggested Fix |
|---|---|---|---|
| # | More | generic text | Replace with descriptive text |
Before: More Suggested: # | |||
| # | (empty) | empty | Add link text or aria-label |
| main.rss | (empty) | empty | Add link text or aria-label |
| https://twitter.com/FFmpeg | (empty) | empty | Add link text or aria-label |
| https://www.facebook.com/ffmpeg | (empty) | empty | Add link text or aria-label |
| https://chemnitzer.linux-tage.de/2015/en… | here | generic text | Replace with descriptive text |
Before: here Suggested: En | |||
| https://chemnitzer.linux-tage.de/2015/de… | here | generic text | Replace with descriptive text |
Before: here Suggested: 209 | |||
| http://www.linuxtag.org/2014/ | here | generic text | Replace with descriptive text |
Before: here Suggested: 2014 | |||
| http://chemnitzer.linux-tage.de/2014/en/… | here | generic text | Replace with descriptive text |
Before: here Suggested: Info | |||
Links without text are announced as raw URLs by screen readers.
#; main.rss; https://twitter.com/FFmpeg; https://www.facebook.com/ffmpeg
Links with no accessible text (empty <a></a>, image-only no alt, icon-only no aria-label) are unidentifiable to screen readers.
Source: WCAG 2.1 SC 2.4.4
Generic link text like 'click here' doesn't describe the destination.
# ("More"); https://chemnitzer.linux-tage.de/2015/en/ ("here"); https://chemnitzer.linux-tage.de/2015/de/programm/beitrag/209 ("here"); http://www.linuxtag.org/2014/ ("here"); http://chemnitzer.linux-tage.de/2014/en/info/ ("here")
Generic anchor text ('click here', 'read more', 'learn more') tells screen readers and search engines nothing about the destination.
Learn more ▾ ▴
Out-of-context lists of links read by AT (one navigation pattern) become useless when every link says 'click here'. Use the destination's title or topic as anchor text. Doubles as SEO win — Google passes anchor-text relevance to the destination.
Source: WCAG 2.4.4 / Google Search Central
F404 Error PageActionHTTP 404, bare pageFIX
FFavicon & BrandingAction2 icon(s) detectedFIX
DWeb ManifestActionNot foundFIX
No web manifest found.
DDark Mode SupportActionNo dark mode signalsFIX
Detection limited to meta tags and inline styles.
DPrint StylesheetActionNo print stylesFIX
CLandmark StructureAction2 landmarksREVIEW
Screen reader users cannot quickly navigate to the primary content. Wrap your main content in <main>.
Without a <main> landmark, screen-reader users can't skip past the navigation to the page content — every page starts with re-reading the menu.
Learn more ▾ ▴
The <main> element marks the page's primary content area. Assistive tech offers a 'jump to main' shortcut — but only if <main> exists. Without it, every page navigation forces re-reading the header. Wrap your primary content in a single <main>.
Source: WAI-ARIA / WCAG 2.4.1
Add a skip link as the first focusable element so keyboard users can bypass repeated navigation.
Without a skip-nav link, keyboard users tab through every nav item before reaching content — every page, every visit.
Learn more ▾ ▴
WCAG 2.4.1 (Bypass Blocks) requires a mechanism to skip past repeated content. The standard implementation is a 'Skip to main content' link that's the first focusable element, visually hidden until focused. Three lines of HTML + four of CSS.
Source: WCAG 2.1 SC 2.4.1
BHeading Hierarchy78 headings, 1 skip(s)REVIEW
- H1 FFmpeg
- H2 A complete, cross-platform solution to record, convert and stream audio and video.
- H3 Converting video and audio has never been so easy.
- H1 News duplicate H1
- H3 March 16th, 2026, FFmpeg 8.1 "Hoare" skipped
- H3 August 22nd, 2025, FFmpeg 8.0 "Huffman"
- H3 September 30th, 2024, FFmpeg 7.1 "Péter"
- H3 September 11th, 2024, Coverity
- H3 June 2nd, 2024, native xHE-AAC decoder
- H3 May 13th, 2024, Sovereign Tech Fund
- H3 April 5th, 2024, FFmpeg 7.0 "Dijkstra"
- H3 January 3rd, 2024, native VVC decoder
- H3 December 18th, 2023, IAMF support
- H3 December 12th, 2023, multi-threaded ffmpeg CLI tool
- H3 November 10th, 2023, FFmpeg 6.1 "Heaviside"
- H3 May 31st, 2023, Vulkan decoding
- H3 February 28th, 2023, FFmpeg 6.0 "Von Neumann"
- H3 July 22nd, 2022, FFmpeg 5.1 "Riemann"
- H3 January 17th, 2022, FFmpeg 5.0 "Lorentz"
- H3 June 19th, 2021, IRC
- H3 April 8th, 2021, FFmpeg 4.4 "Rao"
- H3 June 15th, 2020, FFmpeg 4.3 "4:3"
- H3 October 5th, 2019, Bright Lights
- H3 August 5th, 2019, FFmpeg 4.2 "Ada"
- H3 November 6th, 2018, FFmpeg 4.1 "al-Khwarizmi"
- H3 April 20th, 2018, FFmpeg 4.0 "Wu"
- H3 October 15th, 2017, FFmpeg 3.4 "Cantor"
- H3 April 13th, 2017, FFmpeg 3.3 "Hilbert"
- H3 October 30th, 2016, Results: Summer Of Code 2016.
- H4 FFv1 (Mentor: Michael Niedermayer)
- H4 Self test coverage (Mentor: Michael Niedermayer)
- H4 MPEG-4 ALS encoder implementation (Mentor: Thilo Borgmann)
- H4 Tee muxer improvements (Mentor: Marton Balint)
- H4 TrueHD encoder (Mentor: Rostislav Pehlivanov)
- H4 Motion interpolation filter (Mentor: Paul B Mahol)
- H3 September 24th, 2016, SDL1 support dropped.
- H3 August 9th, 2016, FFmpeg 3.1.2 "Laplace"
- H3 July 10th, 2016, ffserver program being dropped
- H3 July 1st, 2016, FFmpeg 3.1.1 "Laplace"
- H3 June 27th, 2016, FFmpeg 3.1 "Laplace"
- H3 March 16th, 2016, Google Summer of Code
- H3 February 15th, 2016, FFmpeg 3.0 "Einstein"
- H3 January 30, 2016, Removing support for two external AAC encoders
- H3 January 16, 2016, FFmpeg 2.8.5, 2.7.5, 2.6.7, 2.5.10
- H3 December 5th, 2015, The native FFmpeg AAC encoder is now stable!
- H3 October 13th, 2015, Telepoint & MediaHub are now supporting our project
- H3 September 29th, 2015, GSoC 2015 results
- H4 Basic servers for network protocols, mentee: Stephan Holljes, mentor: Nicolas George
- H4 Browsing content on the server, mentee: Mariusz Szczepańczyk, mentor: Lukasz Marek
- H4 Directshow digital video capture, mentee: Mate Sebok, mentor: Roger Pack
- H4 Implementing full support for 3GPP Timed Text Subtitles, mentee: Niklesh Lalwani, mentor: Philip Langdale
- H4 libswscale refactoring, mentee: Pedro Arthur, mentors: Michael Niedermayer, Ramiro Polla
- H4 AAC Encoder Improvements, mentee: Rostislav Pehlivanov, mentor: Claudio Freire
- H4 Animated Portable Network Graphics (APNG), mentee: Donny Yang, mentor: Paul B Mahol
- H3 September 9th, 2015, FFmpeg 2.8
- H3 August 1st, 2015, A message from the FFmpeg project
- H3 July 4th, 2015, FFmpeg needs a new host
- H3 March 16, 2015, FFmpeg 2.6.1
- H3 March 4, 2015, Google Summer of Code
- H3 March 1, 2015, Chemnitzer Linux-Tage
- H3 December 5, 2014, FFmpeg 2.5
- H3 October 10, 2014, FFmpeg is in Debian unstable again
- H3 October 8, 2014, FFmpeg secured a place in OPW!
- H3 September 15, 2014, FFmpeg 2.4
- H3 August 20, 2014, FFmpeg 2.3.3, 2.2.7, 1.2.8
- H3 July 29, 2014, Help us out securing our spot in OPW
- H3 July 20, 2014, New website
- H3 July 17, 2014, FFmpeg 2.3
- H3 July 3, 2014, FFmpeg and the Outreach Program For Women
- H3 June 29, 2014, FFmpeg 2.2.4, 2.1.5, 2.0.5, 1.2.7, 1.1.12, 0.10.14
- H3 May 1, 2014, LinuxTag
- H3 April 18, 2014, OpenSSL Heartbeat bug
- H3 April 11, 2014, FFmpeg 2.2.1
- H3 March 24, 2014, FFmpeg 2.2
- H3 February 3, 2014, Chemnitzer Linux-Tage
- H3 February 9, 2014, trac.ffmpeg.org / trac.mplayerhq.hu Security Breach
- H3 November 12, 2013, FFmpeg RFP in Debian
- H3 October 28, 2013, FFmpeg 2.1
A page should have only one H1. Multiple H1s dilute the document outline.
Multiple H1s blur the page's primary topic — screen-reader users and Google both prefer one H1.
Learn more ▾ ▴
HTML5's outline algorithm technically allows multiple H1s within sectioning content, but no browser implements it. In practice: one H1 per page. Use H2-H6 for subsections.
Source: WCAG 2.4.6 / Google Search Central
Skipping heading levels breaks the document outline. Screen readers may interpret missing levels as structural errors.
Skipping heading levels breaks the document outline — screen-reader users lose track of section nesting.
Learn more ▾ ▴
Screen reader users navigate by jumping between headings (H1 → H2 → H3). Skipping (H1 → H3) breaks the sense of hierarchy. Use sequential levels even if you don't like the default styling — restyle with CSS instead. WCAG 1.3.1 (Info and Relationships) treats this as an A failure.
Source: WCAG 2.1 SC 1.3.1 / W3C WAI
CColor Contrast (Screenshot)Action20 text elements analyzed, 20 fail WCAG AAREVIEW
Analyzes text contrast against the actual rendered page, including background images, gradients, and overlays that CSS-based tools cannot detect.
Show all checked elements (20)
| Element | Ratio | Required | FG | BG | Result |
|---|---|---|---|---|---|
| h1 FFmpeg | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h1 News | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h2 A complete, cross-pl… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 Converting | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 and | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 has never been so ea… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 March 16th, 2026, FF… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 August 22nd, 2025, F… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 September 30th, 2024… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 September 11th, 2024… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 June 2nd, 2024, nati… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 May 13th, 2024, Sove… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 April 5th, 2024, FFm… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 January 3rd, 2024, n… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 December 18th, 2023,… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 December 12th, 2023,… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 CLI tool | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 November 10th, 2023,… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 May 31st, 2023, Vulk… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
| h3 February 28th, 2023,… | 1.61:1 | 3.0:1 | #000000 | #313131 | Fail |
Methodology: The top 20 text elements by font size were checked. Background color was sampled from the desktop screenshot using a 5-point pattern. WCAG 2.1 AA requires 4.5:1 for normal text and 3:1 for large text.
CLighthouse Accessibility AuditsActionScore 73/100 — 5 failing, 11 passedREVIEW
Accessibility
These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.
Contrast
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Download div.row > div.col-md-6 > div.btn-download-wrapper > a.btn |
Discover more div#index > div.well > div.text-right > a.btn |
Past news div.page-content > div#index > div.text-right > a.btn |
Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
FFmpeg 8.1 "Hoare" div.page-content > div#index > p > a |
Khronos blog div.page-content > div#index > p > a |
FFmpeg 8.0 "Huffman" div.page-content > div#index > p > a |
Vulkan decoding div.page-content > div#index > p > a |
code.ffmpeg.org div.page-content > div#index > p > a |
FFmpeg 7.1 "Péter" div.page-content > div#index > p > a |
changelog div.page-content > div#index > p > a |
Coverity (a static analyzer) div.page-content > div#index > p > a |
Sovereign Tech Fund div.page-content > div#index > p > a |
Sovereign Tech Fund div.page-content > div#index > p > a |
FFmpeg 7.0 "Dijkstra" div.page-content > div#index > p > a |
native VVC decoder div.page-content > div#index > p > a |
IAMF support div.page-content > div#index > p > a |
multi-threaded ffmpeg CLI tool div.page-content > div#index > p > a |
Changelog div.page-content > div#index > p > a |
APIchanges div.page-content > div#index > p > a |
IAMF div.page-content > div#index > p > a |
FFmpeg 6.1 "Heaviside" div.page-content > div#index > p > a |
documentation page div.page-content > div#index > p > a |
repository div.page-content > div#index > p > a |
FFmpeg 6.0 "Von Neumann" div.page-content > div#index > p > a |
FFmpeg 5.1 "Riemann" div.page-content > div#index > p > a |
FFmpeg 5.0 "Lorentz" div.page-content > div#index > p > a |
contact#IRCChannels div.page-content > div#index > p > a |
FFmpeg 4.4 "Rao" div.page-content > div#index > p > a |
FFmpeg 4.3 "4:3" div.page-content > div#index > p > a |
Incredibles 2 Screen Slaver div.page-content > div#index > p > a |
trac div.page-content > div#index > p > a |
See for yourself div.page-content > div#index > p > a |
please let me know div.page-content > div#index > p > a |
since 2013 div.page-content > div#index > p > a |
FFmpeg 4.2 "Ada" div.page-content > div#index > p > a |
FFmpeg 4.1 "al-Khwarizmi" div.page-content > div#index > p > a |
FFmpeg 4.0 "Wu" div.page-content > div#index > p > a |
FFmpeg 3.4 "Cantor" div.page-content > div#index > p > a |
FFmpeg 3.3 "Hilbert" div.page-content > div#index > p > a |
FFmpeg 3.1.2 div.page-content > div#index > p > a |
FFmpeg 3.1.1 div.page-content > div#index > p > a |
FFmpeg 3.1 "Laplace" div.page-content > div#index > p > a |
Google Summer of Code div.page-content > div#index > p > a |
project ideas page div.page-content > div#index > p > a |
FFmpeg 3.0 "Einstein" div.page-content > div#index > p > a |
Changelog div#index > ul > li > a |
stable div.page-content > div#index > p > a |
Kamedo2 div.page-content > div#index > p > a |
bug tracker div.page-content > div#index > p > a |
Telepoint ul > li > p > a |
Google Summer of Code div.page-content > div#index > p > a |
Google div.page-content > div#index > p > a |
VideoLAN Developer Days div.page-content > div#index > p > a |
FFmpeg div.page-content > div#index > p > a |
MPlayer div.page-content > div#index > p > a |
rtmpdump div.page-content > div#index > p > a |
ffmpeg-devel div.page-content > div#index > p > a |
trac div.page-content > div#index > p > a |
samples repo div.page-content > div#index > p > a |
Google Summer of Code div.page-content > div#index > p > a |
project ideas page div.page-content > div#index > p > a |
here div.page-content > div#index > p > a |
here div.page-content > div#index > p > a |
FFmpeg packages in Debian unstable div.page-content > div#index > p > a |
Read the argumentation over at Debian. div.page-content > div#index > p > a |
OPW wiki page div.page-content > div#index > p > a |
Click&Pledge div.page-content > div#index > p > a |
e-mail div.page-content > div#index > p > a |
db0 div.page-content > div#index > p > a |
OPW div.page-content > div#index > p > a |
email address div.page-content > div#index > p > a |
security issue in the LZO implementation div.page-content > div#index > p > a |
here div.page-content > div#index > p > a |
archive div.page-content > div#index > p > a |
"OpenSSL heartbleed" div.page-content > div#index > p > a |
here div.page-content > div#index > p > a |
Rogério Brito div.page-content > div#index > p > a |
ticket #729203 div.page-content > div#index > p > a |
These are opportunities to improve the legibility of your content.
Navigation
Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
March 16th, 2026, FFmpeg 8.1 "Hoare" div#page-content-wrapper > div.page-content > div#index > h3#pr8.1 |
These are opportunities to improve keyboard navigation in your application.
Names and labels
Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div#page-content-wrapper > header.content-header > h1 > a#menu-toggle div#page-content-wrapper > header.content-header > h1 > a#menu-toggle |
div#index > h1#news > span.pull-right > a div#index > h1#news > span.pull-right > a |
div#index > h1#news > span.pull-right > a div#index > h1#news > span.pull-right > a |
div#index > h1#news > span.pull-right > a div#index > h1#news > span.pull-right > a |
These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.
Best practices
One main landmark helps screen reader users navigate a web page. Learn more about landmarks.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
html html |
These items highlight common accessibility best practices.