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Mux

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Mux is a US-based video infrastructure platform. Mux Video (stream.mux.com) handles encoding, storage, and adaptive streaming via HLS for on-demand and live video; Mux Data instruments any HTML5 video player to measure playback quality, viewer engagement, and Quality of Experience. Mux Data sets identifiers in the visitor browser to track sessions and is the more consent-sensitive component of the offering.

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Overview

What does Mux do?

What Mux is

Mux is a video infrastructure company founded in 2016 by the original creators of Zencoder, headquartered in San Francisco. It offers two main products: Mux Video, an API-first encoding and HLS streaming service for on-demand and live video; and Mux Data, a player analytics SDK that measures playback quality of experience and viewer engagement on any HTML5 player, including bring-your-own scenarios.

What data Mux processes

Mux Video: visitor IP, user agent, requested HLS segment, bandwidth measurements, geographic country derived from IP. Mux Data: per-viewer identifier (stored in localStorage), playback events, buffering, bitrate, error codes, player and device info, CDN provider information. Mux Data can also pass custom dimensions (logged-in user ID, content ID, A/B test bucket) when the publisher chooses to send them.

GDPR and ePrivacy implications

Video delivery itself can rely on legitimate interest as a technical necessity. Mux Data is a tracking module: it stores a persistent viewer identifier and emits events, qualifying as non-essential under ePrivacy and TTDSG and requiring consent. Mux supports an anonymous mode for Mux Data, which removes the persistent identifier and the IP precision; this mode may be eligible for the consent exemption depending on national supervisory authority guidance.

International data transfers

Mux processes encoding, storage, and analytics in the United States. Video delivery uses Fastly and CDN partner PoPs worldwide, including the EU. Transfers rely on Standard Contractual Clauses under Art. 46(2)(c) GDPR and on Mux's EU-US Data Privacy Framework certification. A Transfer Impact Assessment is recommended.

Practical compliance steps

Sign the Mux DPA, gate Mux Data behind your CMP (load only after consent), enable the anonymous mode for Mux Data where the use case allows it, refrain from passing logged-in user IDs as custom dimensions without consent, document Mux in your RoPA as a processor, and mention Mux and the US transfer mechanism in the privacy notice.

Compliance

Mux and the GDPR

Mux is classified as “Preferences”. On a site that targets European visitors, it must only load after the visitor consents, and it must be listed in your cookie policy.

Legal basis
Consent (Art. 6(1)(a) GDPR) for the Mux Data analytics module; legitimate interest (Art. 6(1)(f)) for video delivery itself
Risk level
medium
Applicable regulations
GDPR, ePrivacy Directive, CCPA, COPPA (where children may be viewers)

Impact assessment (DPIA)

Mux processes two distinct flows. Video delivery: visitor IP, user agent, requested media segment, bandwidth measurements (used for adaptive bitrate). Mux Data analytics: a per-viewer identifier (mux_viewer_id), playback events (start, pause, seek, error), buffering ratios, CDN provider, and player diagnostics. Key DPIA considerations: (1) the Mux Data identifier is a persistent first-party storage item that requires consent under ePrivacy and TTDSG; (2) playback metadata can reveal sensitive information when combined with the video subject (e.g., medical training videos); (3) US default processing requires SCCs and DPF; (4) live streaming may involve real-time chat overlays that capture additional personal data; (5) Mux integrations with personalisation tools can stitch playback events to customer profiles.

Sample text for your banner

Our website uses Mux to deliver and analyse video content. Mux Video streams the media via stream.mux.com (US, with global CDN PoPs). Mux Data, our video analytics module, sets a viewer identifier to measure playback quality and engagement; it loads only after you have accepted analytics cookies. Transfers to the United States rely on Standard Contractual Clauses and the EU-US Data Privacy Framework.
Cookies and trackers

What Mux sets and contacts

Tracking method
Video player JavaScript (mux.js or HLS.js plus Mux Data SDK) plus server-side encoding and delivery via stream.mux.com
Server location
United States (Mux, Inc., San Francisco) with global edge delivery through Fastly and CDN partners; EU origin processing available on request for some products
Data transferred outside the EU
Mux is a US-based video infrastructure company. Encoding, storage, and analytics are processed in the United States; video delivery uses a global CDN with EU PoPs. International transfers rely on Standard Contractual Clauses under Art. 46(2)(c) GDPR and on the EU-US Data Privacy Framework certification.

Cookies set (3)

NameTypeDurationPurpose
mux_viewer_id (localStorage)AnalyticsUp to 1 yearPersistent viewer identifier stored in localStorage by the Mux Data SDK. Used to attribute playback events to a unique viewer for Quality of Experience reporting.
mux-event-buffer (localStorage)Analytics / FunctionalSessionTemporary buffer used by the Mux Data SDK to queue playback events before sending them to the Mux ingestion endpoint, ensuring no events are lost during brief network disruptions.
mux_player_settings (localStorage)Functional / PreferenceUp to 1 yearStores user preferences for the Mux Player (volume, captions, playback speed) so the experience is restored between visits.

Third-party domains contacted (6)

  • mux.com
  • www.mux.com
  • stream.mux.com
  • image.mux.com
  • data.mux.com
  • litix.io
Questions

Frequently asked questions about Mux

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What does Mux store on the visitor device?

Mux Video itself does not write client-side storage for delivery. Mux Data stores a persistent viewer identifier in localStorage (mux_viewer_id) plus event buffering data. In anonymous mode, the viewer identifier is reset frequently or skipped.

Does Mux require user consent?

Mux Video delivery: typically no consent required (legitimate interest). Mux Data analytics: consent required because of the persistent viewer identifier and the playback event tracking. Anonymous mode may qualify for the consent exemption depending on national DPA guidance.

What is the legal basis for using Mux?

Legitimate interest (Art. 6(1)(f)) for video delivery. Consent (Art. 6(1)(a)) for Mux Data analytics in cookied mode. Contract performance (Art. 6(1)(b)) for paid VOD or subscription scenarios.

Does Mux transfer data to the United States?

Yes for encoding, storage, and analytics. Delivery uses global CDN PoPs (including EU). Transfers rely on Standard Contractual Clauses and the EU-US Data Privacy Framework certification of Mux Inc.

Do I need a DPIA for Mux?

For ordinary brand video, no. For platforms with logged-in viewer profiles, sensitive content (medical training, religious content), or large-scale live streaming, document a short DPIA covering the analytics scope and the transfer mechanism.

How do I implement Mux compliantly?

Sign the Mux DPA, gate Mux Data behind your CMP, enable anonymous mode where possible, do not pass logged-in IDs as custom dimensions without consent, document Mux in the RoPA, and mention the US transfer in the privacy notice.

What are the alternatives to Mux?

EU-friendly video alternatives include api.video (France, EU residency), Bunny Stream (Slovenia), Cloudflare Stream (US, EU PoPs), Vimeo OTT, Brightcove, Kaltura (open source / managed), Bitmovin (Austria), and self-hosted FFmpeg + HLS behind your own CDN.

How do I update the cookie policy for Mux?

List the Mux Data viewer identifier (storage type: localStorage; purpose: video QoE analytics; controller: Mux, Inc., US) in the analytics section of the cookie policy. Mention SCCs and DPF for the US transfer and provide a CMP toggle to refuse Mux Data while still being able to play the video.

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