Bug 311156

Summary: REGRESSION (STP 239-240): MediaStreamTrack DataCloneError: The object can not be cloned
Product: WebKit Reporter: bennett.chen
Component: MediaAssignee: youenn fablet <youennf>
Status: RESOLVED FIXED    
Severity: Critical CC: ap, jer.noble, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Test MediaStreanTrack Clone none

bennett.chen
Reported 2026-03-30 19:28:41 PDT
Created attachment 478856 [details] Test MediaStreanTrack Clone In the current preview version(240), MediaStreamTrack does not appear to support structured cloning. When attempting to transfer or clone a track (e.g., via postMessage to a Worker), it throws the following error: DataCloneError: The object can not be cloned
Attachments
Test MediaStreanTrack Clone (3.14 KB, application/zip)
2026-03-30 19:28 PDT, bennett.chen 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Alexey Proskuryakov
Comment 1 2026-04-01 16:06:31 PDT
Thank you for the report! I cannot reproduce this in STP 240. I get two mirrored videos, and no errors in console.
Alexey Proskuryakov
Comment 2 2026-04-01 16:09:08 PDT
My mistake, I still had STP 239 on this machine. I can reproduce with STP 240.
Radar WebKit Bug Importer
Comment 3 2026-04-01 16:09:16 PDT
<rdar://problem/173891803>
youenn fablet
Comment 4 2026-04-07 03:26:04 PDT
Pull request: https://github.com/WebKit/WebKit/pull/62186
EWS
Comment 5 2026-04-07 09:50:14 PDT
Committed 310717@main (3bf2b90a001e): <https://commits.webkit.org/310717@main> Reviewed commits have been landed. Closing PR #62186 and removing active labels.
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