infra/stacks/f1-stream/files/.planning/phases/04-video-extraction-native-playback/04-VERIFICATION.md

phase	verified	status	score	re_verification
04-video-extraction-native-playback	2026-02-17T22:00:00Z	passed	11/11 must-haves verified	false

Phase 4: Video Extraction and Native Playback Verification Report

Phase Goal: When a stream URL contains an extractable video source, users watch it in a clean native HTML5 player instead of loading the third-party page

Verified: 2026-02-17T22:00:00Z

Status: passed

Re-verification: No — initial verification

Goal Achievement

Observable Truths

#	Truth	Status	Evidence
1	GET /api/streams/{id}/extract returns a JSON response with extracted video source URL and type when the stream page contains a video source	✓ VERIFIED	Endpoint exists in server.go:83, handler at server.go:242-295 returns JSON with sources array and stream_id
2	Extractor can find HLS .m3u8 URLs from video/source src attributes and script tag contents	✓ VERIFIED	DOM extraction at extractor.go:166-192, regex patterns at extractor.go:196,201, matches .m3u8 in video/source/iframe src
3	Extractor can find DASH .mpd URLs from video/source src attributes and script tag contents	✓ VERIFIED	DOM extraction at extractor.go:166-192, regex patterns at extractor.go:197,202, matches .mpd in video/source/iframe src
4	Extractor can find direct MP4/WebM URLs from video/source src attributes	✓ VERIFIED	DOM extraction at extractor.go:166-192, regex patterns at extractor.go:198-199, matches .mp4/.webm in video/source/iframe src
5	Extractor can find video URLs from jwplayer, video.js, and hls.js setup calls in script tags	✓ VERIFIED	Regex patterns at extractor.go:200-202 for JWPlayer (file:), hls.js/video.js (src:=), script extraction at extractor.go:206-223
6	GET /api/streams/{id}/extract returns empty result (not error) when no video source is found	✓ VERIFIED	Returns []VideoSource{} at extractor.go:66,306 with nil error when no sources found
7	When a stream has an extractable HLS source, the user sees a native video player on the app page instead of an iframe loading the third-party site	✓ VERIFIED	tryExtractVideo at streams.js:172-189 fetches extract endpoint, renderNativePlayer at streams.js:200-228 creates HTML5 video element
8	When a stream has an extractable MP4/WebM source, the user sees a native HTML5 video element playing the stream	✓ VERIFIED	renderNativePlayer at streams.js:200-228 handles mp4/webm by setting video.src directly (line 223)
9	When extraction fails or returns no sources, the user sees the existing iframe fallback (no regression)	✓ VERIFIED	tryExtractVideo calls renderIframeFallback at streams.js:188 on error/empty sources, renderIframeFallback at streams.js:230-246 creates iframe element
10	HLS streams play using hls.js library when the browser does not support HLS natively	✓ VERIFIED	HLS.js loaded from CDN at index.html:162, renderNativePlayer checks Hls.isSupported() at streams.js:212, creates new Hls() at streams.js:213-215, Safari native fallback at streams.js:216-217
11	The video player has standard controls (play, pause, volume, fullscreen)	✓ VERIFIED	video.controls = true at streams.js:205, HTML5 video element provides standard browser controls including play, pause, volume, fullscreen

Score: 11/11 truths verified

Required Artifacts

Artifact	Expected	Status	Details
internal/extractor/extractor.go	Video source URL extraction from HTML pages	✓ VERIFIED	326 lines, exports Extract function and VideoSource type, implements DOM parsing with golang.org/x/net/html and regex extraction from script tags
internal/server/server.go	API endpoint for video extraction	✓ VERIFIED	Route registered at line 83, handler at lines 242-295, calls extractor.Extract, returns JSON with sources array and Cache-Control headers
static/index.html	HLS.js library script tag	✓ VERIFIED	HLS.js CDN script tag at line 162 before other JS scripts
static/js/streams.js	Updated streamCard with native video player support	✓ VERIFIED	398 lines total, includes tryExtractVideos (168-170), tryExtractVideo (172-189), renderNativePlayer (200-228), renderIframeFallback (230-246), pickBestSource (191-198)

Key Link Verification

From	To	Via	Status	Details
internal/server/server.go	internal/extractor/extractor.go	handler calls extractor.Extract	✓ WIRED	Import at server.go:13, call at server.go:282 with client and streamURL parameters
internal/server/server.go	internal/store	handler looks up stream by ID	✓ WIRED	Import at server.go:16, LoadStreams() call at server.go:246, iterates to find stream by ID at lines 255-264
static/js/streams.js	/api/streams/{id}/extract	fetch call to extract endpoint	✓ WIRED	fetch call at streams.js:174 with template literal for stream ID, response parsed as JSON at line 176
static/js/streams.js	Hls	HLS.js library for .m3u8 playback	✓ WIRED	Hls.isSupported() check at streams.js:212, new Hls() instantiation at streams.js:213, loadSource/attachMedia at streams.js:214-215

Requirements Coverage

Requirement	Source Plan	Description	Status	Evidence
EMBED-01	04-01-PLAN.md	Proxy fetches stream page and attempts to extract direct video source URL (HLS .m3u8, DASH .mpd, direct MP4/WebM, or embedded video player source)	✓ SATISFIED	Extractor package at internal/extractor/extractor.go implements all extraction types: HLS (lines 107,117,147,196,201,229), DASH (lines 109,120,148,197,202,235), MP4 (lines 111,149,198), WebM (lines 113,150,199), JWPlayer/video.js/hls.js patterns (lines 200-202). Server-side extraction via handleExtractVideo at server.go:242-295
EMBED-02	04-02-PLAN.md	When direct video source is found, render it in a minimal HTML5 video player on the app's own page (no third-party page loaded)	✓ SATISFIED	renderNativePlayer at streams.js:200-228 creates HTML5 video element with controls=true (line 205), integrates HLS.js for .m3u8 sources (lines 212-215), sets src directly for mp4/webm (line 223), replaces loading placeholder in player-wrap div preventing third-party page load

Anti-Patterns Found

None detected.

Scanned files:

• internal/extractor/extractor.go: No TODO/FIXME/placeholder comments, no empty implementations, substantive extraction logic
• internal/server/server.go: Handler implementation complete, proper error handling, cache headers set
• static/js/streams.js: No TODO/FIXME/placeholder comments, complete extraction-first rendering logic
• static/index.html: HLS.js script tag present, no issues

Human Verification Required

None. All verification completed programmatically.

Phase Summary

Phase 4 successfully delivers video extraction and native playback capability. The backend extractor can identify HLS, DASH, MP4, and WebM sources from both DOM elements and script tags. The frontend attempts extraction first and upgrades to a native HTML5 video player when sources are found, falling back to iframe rendering when extraction fails or returns no results.

Key accomplishments:

• Server-side video source extraction with multiple strategies (DOM parsing + regex script extraction)
• Native HTML5 video player with HLS.js integration for .m3u8 streams
• Progressive enhancement pattern: render placeholder, attempt extraction, upgrade or fallback
• No breaking changes to existing iframe fallback behavior
• 5-minute cache on extraction endpoint to reduce upstream load
• Priority-based source selection (HLS > DASH > MP4 > WebM)

Technical quality:

• All artifacts exist, substantive, and properly wired
• No anti-patterns detected
• Consistent error handling with silent fallback to iframe
• User-Agent and timeout patterns match existing proxy/scraper conventions
• Proper use of golang.org/x/net/html for DOM parsing
• HLS.js loaded from CDN with browser capability detection

Requirements fulfilled:

• EMBED-01: Video source extraction from stream pages ✓
• EMBED-02: Native HTML5 video player rendering ✓

Phase goal achieved. Users can now watch streams with extractable video sources in a clean native player without loading third-party pages.

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Verified: 2026-02-17T22:00:00Z

Verifier: Claude (gsd-verifier)