What is media3-video-playback?

A guide for building Android video playback with Media3, a library for playing media, including video surfaces, aspect ratio, first-frame display, HDR, picture-in-picture, and fullscreen.

Use it when fixing video rendering, first-frame handoff, HDR, picture-in-picture, fullscreen, or scrolling-feed playback.

It helps prevent visual glitches such as flicker, incorrect cropping, and placeholders disappearing at the wrong time. It also sets rules for choosing display surfaces and sharing playback state safely between Android and shared code.

media3-video-playback — Skill for Claude Code and Codex by sunnat629

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add sunnat629/android-media-pack --skill media3-video-playback

Clone the repo

git clone --depth 1 https://github.com/sunnat629/android-media-pack

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sunnat629/android-media-pack/media3-video-playback/github.svg)](https://agentmods.dev/skills/sunnat629/android-media-pack/media3-video-playback)

Your own site

<a href="https://agentmods.dev/skills/sunnat629/android-media-pack/media3-video-playback"><img src="https://agentmods.dev/badge/skills/sunnat629/android-media-pack/media3-video-playback/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/sunnat629/android-media-pack/media3-video-playback"><img src="https://agentmods.dev/badge/skills/sunnat629/android-media-pack/media3-video-playback.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 414 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00037	$0.00414
Opus 5	$0.00018	$0.00207
Sonnet 5	$0.00007	$0.00083
Haiku 4.5	$0.00004	$0.00041

Measured 10d ago against content hash 5da24dbe8816, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

media3-video-playback scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.skills/media/playback/media3-video-playback/SKILL.md · 48 lines

What it actually says

Trigger

Use for video rendering bugs, blink/flicker, wrong crop, first-frame handoff, PiP, HDR, or fullscreen behavior.

Rules

Start with streaming-media-architecture for ownership, KMP split, preload window, and telemetry.
Pin Media3 to 1.10.1 through the version catalog.
Keep Media3 APIs in Android source sets; expose KMP-safe state/events upward.
Use onRenderedFirstFrame plus media identity to remove placeholders.
Do not change surface type while the player is attached.
SurfaceView is PREFERRED everywhere, including inline scrollers. Fall back to TextureView only when SurfaceView cannot satisfy the requirement, for example smooth scroll or transition animation on pre-API 24 devices. TextureView costs more power, has weaker frame timing, and cannot show HDR or secure (DRM) output.
Aspect comes from onVideoSizeChanged, not thumbnail size.

Example

val readyForVideo = state.mediaUri == uri && state.renderedMediaUri == uri
// thumbnail visible while !readyForVideo

media3-compose-ui-material3
media3-analytics-telemetry
streaming-media-architecture

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

10d ago First seen · 48 lines · 37 tokens per session scan A 5da24dbe8816

Subscribe to this mod's changes

media3-video-playback is a skill published in the GitHub repository sunnat629/android-media-pack (13 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 37 tokens to every session and 414 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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