Does LG webOS support VPAID?

No. VPAID is not supported on LG webOS. While webOS has a Chromium-based browser engine, VPAID JavaScript execution is blocked in the ad player context. VPAID creatives are silently dropped.

What VAST versions does LG webOS support?

LG webOS apps using the IMA SDK support VAST 2.0 through 4.1. Apps using a custom VAST parser built on the webOS media pipeline typically support VAST 2.0 and 3.0.

What video format is required for VAST ads on LG webOS?

MP4 with H.264 video and AAC audio is required. HLS is also supported and recommended. WebM support varies by webOS version and device; don't rely on it.

VAST XML for LG webOS Smart TV

LG Smart TVs run webOS, a Linux-based OS with a Chromium-based browser engine. Ad playback in webOS apps is handled either by the Google IMA SDK (via the Cast SDK integration) or by custom VAST parsers built on the webOS MSE/EME pipeline. LG webOS is the third-largest Smart TV platform globally by installed base.

Quick reference

VAST versions	2.0, 3.0, 4.0, 4.1 (IMA); 2.0–3.0 (native)
VPAID	Blocked in ad player context
Wrapper chain limit	4 hops (IMA); 3 hops safe maximum (native)
Required media format	MP4 H.264 + AAC; HLS supported
HTTPS	Required for all URLs

VPAID

Although webOS has a Chromium engine capable of running JavaScript, the ad player context on webOS does not expose the VPAID execution environment. Any <MediaFile apiFramework="VPAID"> is silently discarded. The slot either falls back to a non-VPAID creative in the same tag or goes unfilled.

→ vastlint rule: VAST-4.1-vpaid-in-interactive-context

Media file requirements

MP4 H.264 is universally supported across all webOS versions (2.x through 24.x). HLS adaptive streams are supported on webOS 3.0 and later. WebM support is inconsistent across device generations — always provide MP4 as the primary format.

<MediaFiles>
  <MediaFile type="video/mp4" width="1920" height="1080"
             bitrate="5000" delivery="progressive">
    <![CDATA[https://cdn.example.com/ad-1080p.mp4]]>
  </MediaFile>
  <MediaFile type="video/mp4" width="1280" height="720"
             bitrate="2500" delivery="progressive">
    <![CDATA[https://cdn.example.com/ad-720p.mp4]]>
  </MediaFile>
</MediaFiles>

HTTPS requirement

webOS enforces HTTPS for all network requests in app contexts. HTTP URLs for media files, impression trackers, and wrapper URIs will fail. On older webOS devices (2.x–3.x), some HTTP failures may not surface as explicit errors — the request simply times out silently.

Wrapper chains

For apps using IMA SDK, the 4-hop limit applies. For apps using native webOS VAST parsers, 3 hops is the recommended maximum to avoid timeout failures — webOS devices range widely in network stack performance across generations (webOS 2.x devices from 2015 through webOS 24.x devices from 2024).

Duration format

<!-- ✅ Always use HH:MM:SS format -->
<Duration>00:00:30</Duration>

→ vastlint rule: VAST-2.0-duration-format

Pre-flight checklist for LG webOS

No VPAID creatives
Target VAST 3.0 if player integration is unknown
All URLs use HTTPS
Wrapper chain ≤ 3 hops
MP4 H.264 <MediaFile> at 1080p and 720p
<Duration> in HH:MM:SS format
<Impression> with HTTPS URL present
version attribute on root <VAST> element

References

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