Bug: Intermittent browser/components/aboutwelcome/tests/browser/browser_aboutwelcome_multistage_video.js | single tracking bug
Status: NEW
Priority: P1
Created: 2025-02-20 19:22:58+00:00
Resolved: 2025-03-03 18:05:20+00:00

**Filed by:** amarc [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=495868645&repo=mozilla-esr128
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/cgbeNgryRtSq1LahbJXuKg/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2025-02-20T18:13:38.336Z] 18:13:38     INFO - TEST-START | browser/components/aboutwelcome/tests/browser/browser_aboutwelcome_multistage_video.js
[task 2025-02-20T18:13:43.628Z] 18:13:43     INFO - GECKO(1191) | [Child 1197, MediaDecoderStateMachine #1] WARNING: Decoder=10ca9eb00 Decode error: NS_ERROR_FAILURE (0x80004005) - Couldn't start RDD process: file /builds/worker/checkouts/gecko/dom/media/MediaDecoderStateMachineBase.cpp:167
[task 2025-02-20T18:13:47.683Z] 18:13:47     INFO - TEST-INFO | started process screencapture
[task 2025-02-20T18:13:48.507Z] 18:13:48     INFO - TEST-INFO | screencapture: exit 0
[task 2025-02-20T18:13:48.507Z] 18:13:48     INFO - Buffered messages logged at 18:13:38
[task 2025-02-20T18:13:48.507Z] 18:13:48     INFO - Entering test bound test_aboutwelcome_video_autoplay
[task 2025-02-20T18:13:48.508Z] 18:13:48     INFO - TEST-PASS | browser/components/aboutwelcome/tests/browser/browser_aboutwelcome_multistage_video.js | Autoplay is allowed on about:welcome - 
[task 2025-02-20T18:13:48.508Z] 18:13:48     INFO - Buffered messages logged at 18:13:43
[task 2025-02-20T18:13:48.508Z] 18:13:48     INFO - Console message: [JavaScript Warning: "Media resource https://www.mozilla.org/tests/dom/media/webaudio/test/noaudio.webm could not be decoded." {file: "about:welcome" line: 0}]
[task 2025-02-20T18:13:48.509Z] 18:13:48     INFO - Buffered messages logged at 18:13:44
[task 2025-02-20T18:13:48.509Z] 18:13:48     INFO - Console message: [JavaScript Warning: "Media resource https://www.mozilla.org/tests/dom/media/webaudio/test/noaudio.webm could not be decoded, error: Error Code: NS_ERROR_FAILURE (0x80004005)
[task 2025-02-20T18:13:48.509Z] 18:13:48     INFO - Details: Couldn't start RDD process" {file: "about:welcome" line: 0}]
[task 2025-02-20T18:13:48.509Z] 18:13:48     INFO - Buffered messages finished
[task 2025-02-20T18:13:48.510Z] 18:13:48     INFO - TEST-UNEXPECTED-FAIL | browser/components/aboutwelcome/tests/browser/browser_aboutwelcome_multistage_video.js | Uncaught exception in test bound test_aboutwelcome_video_autoplay - Waiting for video to play - timed out after 50 tries.
[task 2025-02-20T18:13:48.510Z] 18:13:48     INFO - Leaving test bound test_aboutwelcome_video_autoplay
[task 2025-02-20T18:13:48.511Z] 18:13:48     INFO - Entering test bound test_aboutwelcome_video_no_autoplay
[task 2025-02-20T18:13:48.511Z] 18:13:48     INFO - TEST-PASS | browser/components/aboutwelcome/tests/browser/browser_aboutwelcome_multistage_video.js | Autoplay is allowed on about:welcome - 
[task 2025-02-20T18:13:49.843Z] 18:13:49     INFO - TEST-PASS | browser/components/aboutwelcome/tests/browser/browser_aboutwelcome_multistage_video.js | Video should not have an error - true == true - 
[task 2025-02-20T18:13:49.851Z] 18:13:49     INFO - Leaving test bound test_aboutwelcome_video_no_autoplay
[task 2025-02-20T18:13:50.094Z] 18:13:50     INFO - GECKO(1191) | MEMORY STAT | vsize 8223MB | residentFast 417MB | heapAllocated 166MB
[task 2025-02-20T18:13:50.094Z] 18:13:50     INFO - TEST-OK | browser/components/aboutwelcome/tests/browser/browser_aboutwelcome_multistage_video.js | took 11758ms
[task 2025-02-20T18:13:50.095Z] 18:13:50     INFO - Not taking screenshot here: see the one that was previously logged
[task 2025-02-20T18:13:50.095Z] 18:13:50     INFO - TEST-UNEXPECTED-FAIL | browser/components/aboutwelcome/tests/browser/browser_aboutwelcome_multistage_video.js | Found an unexpected tab at the end of test run: about:welcome - 
[task 2025-02-20T18:13:50.105Z] 18:13:50     INFO - checking window state
[task 2025-02-20T18:13:50.109Z] 18:13:50     INFO - TEST-START | browser/components/aboutwelcome/tests/browser/browser_aboutwelcome_observer.js
```