Bug 206614

Summary: REGRESSION: [ Mac wk2 ] compositing/video/video-border-radius-clipping.html is a flaky image failure
Product: WebKit Reporter: Truitt Savell <tsavell>
Component: CompositingAssignee: Peng Liu <peng.liu6>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: peng.liu6, simon.fraser, webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugs.webkit.org/show_bug.cgi?id=205226

Description Truitt Savell 2020-01-22 14:45:20 PST 
compositing/video/video-border-radius-clipping.html

Description:
This test is a flaky failure on Mac WK2. It is a known constant failure on Catalina wk1 from webkit.org/b/205226
The diff shows a 1 when it should be a 4 with a lesser blue curve on the left side.
I am able to reproduce this locally by just running this test in iterations. 
It looks like this started around r252246 which is the earliest failure.

History:
https://results.webkit.org/?suite=layout-tests&test=compositing%2Fvideo%2Fvideo-border-radius-clipping.html

Diff:
https://build.webkit.org/results/Apple-Catalina-Release-WK2-Tests/r254939%20(2328)/compositing/video/video-border-radius-clipping-diffs.html
Comment 1 Radar WebKit Bug Importer 2020-01-22 15:44:14 PST 
<rdar://problem/58814182>
Comment 2 Simon Fraser (smfr) 2020-01-22 15:49:12 PST 
We're getting a different video frame.
Comment 3 Alexey Proskuryakov 2020-01-22 23:34:57 PST 
results.webkit.org shows a clear regression in early November, but internal bots have been flakily failing throughout the history.

Why is this test that is about clipping so flaky? Can we just have a video whose frames are all the same perhaps?
Comment 4 Simon Fraser (smfr) 2020-01-23 13:31:15 PST 
It's flakey because it's apparently impossible to have a non-flakey test that actually shows video frames.
Comment 5 Peng Liu 2020-01-27 13:46:50 PST 

*** This bug has been marked as a duplicate of bug 205226 ***