Bug 218391

Summary: Transparent video poster image doesn't keep element transparent once first frame is preloaded
Product: WebKit Reporter: Romaric <hello>
Component: MediaAssignee: Eric Carlson <eric.carlson>
Status: RESOLVED FIXED    
Severity: Normal CC: calvaris, cdumez, changseok, eric.carlson, esprehn+autocc, ews-watchlist, glenn, gyuyoung.kim, jer.noble, kondapallykalyan, pdr, philipj, sergio, smoley, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari 14   
Hardware: Mac   
OS: macOS 10.15   
See Also: https://bugs.webkit.org/show_bug.cgi?id=218723
Attachments:
Description Flags
Patch none

Romaric
Reported 2020-10-30 09:51:21 PDT
In Safari 14, setting a transparent poster image on a video with `preoload="auto"` no longer keeps the video element transparent once the first frame gets loaded, as it did in the previous versions of Safari. The element remains transparent if `preload` is `none` or `metadata`, though. To reproduce: Open the following page in Safari ``` <html> <title>Test video player</title> <body> <h1>Test video player</h1> <video controls src="https://archive.org/download/BigBuckBunny_124/Content/big_buck_bunny_720p_surround.mp4" poster="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7399w" preload="auto" width="640"> </video> </body> </html> ``` Actual result: Once the video preloads enough data, the element's background turns black Expected result: The element remains transparent. Build & Hardware: Version 14.0 (15610.1.28.1.9, 15610) on Mac OS 10.15.6 Additional builds & Platforms: Doesn't happen on Version 13.1.12 (15609.3.5.1.3) on Mac OS 10.15.6
Attachments
Patch (30.44 KB, patch)
2020-11-04 12:51 PST, Eric Carlson 		no flags
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Smoley
Comment 1 2020-10-31 09:56:43 PDT
Thanks for filing, this does not reproduce for me on 13.1.3 or the Safari 14.0.1 beta, but I am reproducing it on TOT.
Radar WebKit Bug Importer
Comment 2 2020-10-31 09:56:53 PDT
<rdar://problem/70916944>
Eric Carlson
Comment 3 2020-11-04 12:51:57 PST
Created attachment 413196 [details] Patch
EWS
Comment 4 2020-11-04 17:05:19 PST
Committed r269407: <https://trac.webkit.org/changeset/269407> All reviewed patches have been landed. Closing bug and clearing flags on attachment 413196 [details].
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