257956 2023-06-12 08:02:40 -0700 MediaStream from canvas (captureStream) cannot be rendered into a different canvas 2023-06-13 11:40:34 -0700 1 1 1 Unclassified WebKit Canvas Safari 16 Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 simon.leber youennf dino eric.carlson jer.noble markericc02 roch.sebastien simon.leber webkit-bug-importer youennf oldest_to_newest 1961041 0 simon.leber 2023-06-12 08:02:40 -0700 The Mediastream returned from a canvas captureStream call can not be used to be rendered into another canvas using drawImage (2d context) or createImageBitmap/transferFromImageBitmap (bitmaprenderer context) The following CodePen shows the problem in a short example. https://codepen.io/sleb91/pen/bGQdPxq I have tested on Safari on Mac (Version 16.5 (18615.2.9.11.4)) and latest IOS Safari (16.5) 1961048 1 466670 roch.sebastien 2023-06-12 08:40:42 -0700 Created attachment 466670 Reproduction Attached reproduction as simple HTML file. 1961268 2 webkit-bug-importer 2023-06-13 01:33:37 -0700 <rdar://problem/110696945> 1961269 3 youennf 2023-06-13 01:36:19 -0700 Pull request: https://github.com/WebKit/WebKit/pull/14910 1961376 4 ews-feeder 2023-06-13 11:40:31 -0700 Committed 265128@main (e7326a948d62): <https://commits.webkit.org/265128@main> Reviewed commits have been landed. Closing PR #14910 and removing active labels. 466670 2023-06-12 08:40:42 -0700 2023-06-12 08:40:42 -0700 Reproduction webkit-bug-video-canvas-capturestream.html text/html 1386 roch.sebastien PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj4KICA8aGVhZD4KICAgIDxtZXRhIGNoYXJz ZXQ9IlVURi04IiAvPgogICAgPG1ldGEgaHR0cC1lcXVpdj0iWC1VQS1Db21wYXRpYmxlIiBjb250 ZW50PSJJRT1lZGdlIiAvPgogICAgPG1ldGEgbmFtZT0idmlld3BvcnQiIGNvbnRlbnQ9IndpZHRo PWRldmljZS13aWR0aCwgaW5pdGlhbC1zY2FsZT0xLjAiIC8+CiAgICA8dGl0bGU+RG9jdW1lbnQ8 L3RpdGxlPgogIDwvaGVhZD4KICA8Ym9keT4KICAgIDxkaXY+Q2FudmFzIHdpdGggcmFuZG9tIG51 bWJlciwgMmQgY29udGV4dDwvZGl2PgogICAgPGNhbnZhcyBpZD0iYzEiIHdpZHRoPSIzMjAiIGhl aWdodD0iMjQwIj48L2NhbnZhcz4KICAgIDxkaXY+VmlkZW8gZnJvbSBjYW52YXMuY2FwdHVyZVN0 cmVhbSgpPC9kaXY+CiAgICA8dmlkZW8+PC92aWRlbz4KICAgIDxkaXY+Q2FudmFzLCBjYXB0dXJl cyBmcm9tIHZpZGVvPC9kaXY+CiAgICA8Y2FudmFzIGlkPSJjMiIgd2lkdGg9IjMyMCIgaGVpZ2h0 PSIyNDAiPjwvY2FudmFzPgogICAgPHNjcmlwdD4KICAgICAgYXN5bmMgZnVuY3Rpb24gc3RhcnQo KSB7CiAgICAgICAgY29uc3QgY2FudmFzID0gZG9jdW1lbnQucXVlcnlTZWxlY3RvcigiI2MxIik7 CiAgICAgICAgY29uc3QgY3R4ID0gY2FudmFzLmdldENvbnRleHQoIjJkIik7CiAgICAgICAgc2V0 SW50ZXJ2YWwoKCkgPT4gewogICAgICAgICAgY3R4LmZpbGxTdHlsZSA9ICJncmVlbiI7CiAgICAg ICAgICBjdHguZmlsbFJlY3QoMCwgMCwgMzIwLCAyNDApOwogICAgICAgICAgY3R4LmZpbGxTdHls ZSA9ICJ3aGl0ZSI7CiAgICAgICAgICBjdHguZmlsbFRleHQoTWF0aC5yYW5kb20oKSwgMTAwLCA1 MCk7CiAgICAgICAgfSwgNjYpOwogICAgICAgIGNvbnN0IHN0cmVhbSA9IGNhbnZhcy5jYXB0dXJl U3RyZWFtKCk7CiAgICAgICAgY29uc3QgdmlkZW8gPSBkb2N1bWVudC5xdWVyeVNlbGVjdG9yKCJ2 aWRlbyIpOwogICAgICAgIHZpZGVvLnNyY09iamVjdCA9IHN0cmVhbTsKICAgICAgICBhd2FpdCB2 aWRlby5wbGF5KCk7CgogICAgICAgIGZyb21WaWRlb1RvQ2FudmFzKHZpZGVvKTsKICAgICAgfQoK ICAgICAgZnVuY3Rpb24gZnJvbVZpZGVvVG9DYW52YXModmlkZW8pIHsKICAgICAgICBjb25zdCBj YW52YXMgPSBkb2N1bWVudC5xdWVyeVNlbGVjdG9yKCIjYzIiKTsKICAgICAgICBjb25zdCBjb250 ZXh0ID0gY2FudmFzLmdldENvbnRleHQoIjJkIik7CiAgICAgICAgY29udGV4dC5kcmF3SW1hZ2Uo dmlkZW8sIDAsIDApOwogICAgICAgIHJlcXVlc3RBbmltYXRpb25GcmFtZSgoKSA9PiBmcm9tVmlk ZW9Ub0NhbnZhcyh2aWRlbykpOwogICAgICB9CiAgICAgIHN0YXJ0KCk7CiAgICA8L3NjcmlwdD4K ICA8L2JvZHk+CjwvaHRtbD4K