Multimedia

What your browser can actually play -- modern video codecs, protected (DRM) streaming, and whether sites can autoplay media.

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Video Codecs

Color key Green — healthy / above target Blue — normal / neutral info Amber — below target, worth a look Red — leak or serious problem Grey — not run yet

Which modern video formats your browser can play.

canPlayType / MediaSource.isTypeSupported for H.264, HEVC, VP9, AV1.

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Protected Playback (DRM)

Color key Green — healthy / above target Blue — normal / neutral info Amber — below target, worth a look Red — leak or serious problem Grey — not run yet

Whether premium streaming (Netflix, Disney+) can play.

EME requestMediaKeySystemAccess: Widevine / PlayReady / FairPlay.

Fix this

Autoplay Policy

Color key Green — healthy / above target Blue — normal / neutral info Amber — below target, worth a look Red — leak or serious problem Grey — not run yet

Whether sites can start video or audio without a click.

navigator.getAutoplayPolicy("mediaelement").

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Video Codecs

What is this?

Every video you stream is compressed with a codec -- a format like H.264, HEVC, VP9, or AV1. This test asks your browser which of these it can actually play, using the same checks a streaming site runs before it picks a stream for you.

So what?

Newer codecs (AV1, HEVC, VP9) deliver the same picture on a fraction of the bandwidth, so a browser that supports them streams 4K more smoothly and uses less data. A browser stuck on H.264 only will fall back to larger, lower-quality streams and may not reach the highest resolutions at all.

Now what?

If you only see H.264, update your browser and operating system -- AV1 and HEVC support often arrive with OS and GPU-driver updates. On desktop, current Chrome, Edge, and Firefox all decode AV1 and VP9.

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Protected Playback (DRM)

What is this?

Paid services like Netflix, Disney+, and Prime Video wrap their HD and 4K streams in Digital Rights Management using Encrypted Media Extensions. Playback only works if your browser ships a supported DRM system: Widevine (Chrome/Firefox/Android), PlayReady (Edge/Windows), or FairPlay (Safari/Apple).

So what?

No supported DRM means protected titles either refuse to play or are capped at low resolution. DRM is also a double edge: the same system quietly identifies your device to the service, which is a tracking surface worth knowing about on a privacy tool.

Now what?

If none is detected and premium video will not play, update your browser; on Linux install the Widevine component (most Chromium browsers prompt for it). For 4K, Edge with PlayReady or Safari with FairPlay is usually required.

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Autoplay Policy

What is this?

Browsers decide whether a page may start media on its own. This test reports your policy: autoplay with sound allowed, muted-only, or blocked until you interact with the page.

So what?

Autoplay-with-sound is handy on a few sites but is mostly used for intrusive ads and surprise audio. A muted-only or blocked policy is the quieter, more private default: media waits for you to press play.

Now what?

To tame autoplay: in Chrome/Edge use Site Settings, then Additional content settings, then Sound; in Firefox use Settings, Privacy and Security, Permissions, Autoplay, and set it to Block Audio and Video.

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