229325 2021-08-20 00:58:21 -0700 Decoding webm file with more than 2 channels will fail 2026-03-05 15:02:00 -0800 1 1 1 Unclassified WebKit Web Audio Other Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 227111 1 jean-yves.avenard jean-yves.avenard cdumez eric.carlson ews-watchlist glenn hartman.wiki jer.noble padenot philipj sergio webkit-bug-importer oldest_to_newest 1785726 0 jean-yves.avenard 2021-08-20 00:58:21 -0700 Decoding of webm with more than 2 channels will fail with a decoding error. STR: 1- Open https://jyavenard.github.io/htmltests/tests/webaudio/decodeAudioData.html 2- Select opus-mapping2.webm in the drop down list 3- press play Result: will show a decoding error as context.decodeAudioData return an error 1785727 1 webkit-bug-importer 2021-08-20 00:58:49 -0700 <rdar://problem/82160691> 1791327 2 437580 jean-yves.avenard 2021-09-07 19:19:20 -0700 Created attachment 437580 Patch 1791502 3 437580 eric.carlson 2021-09-08 09:42:28 -0700 Comment on attachment 437580 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=437580&action=review > Source/WebCore/platform/graphics/cocoa/WebMAudioUtilitiesCocoa.mm:175 > + setVorbisChannelMap(layout, cookie.channelCount); Why do you set the *Vorbis* channel map with an Opus cookie? A comment would be helpful. 1791649 4 437580 jean-yves.avenard 2021-09-08 15:41:45 -0700 Comment on attachment 437580 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=437580&action=review > Source/WebCore/platform/graphics/cocoa/WebMAudioUtilitiesCocoa.mm:176 > + m_channelLayout = layout; https://datatracker.ietf.org/doc/html/rfc7845#section-5.1.1.2 mapping family one uses the vorbis layout. 1791900 5 437580 eric.carlson 2021-09-09 08:32:00 -0700 Comment on attachment 437580 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=437580&action=review >> Source/WebCore/platform/graphics/cocoa/WebMAudioUtilitiesCocoa.mm:176 >> + m_channelLayout = layout; > > https://datatracker.ietf.org/doc/html/rfc7845#section-5.1.1.2 > > mapping family one uses the vorbis layout. Yes, my point is that someone unfamiliar with the RFC may be confused by code so a comment would be helpful. 1854916 6 hartman.wiki 2022-03-24 16:15:33 -0700 This problem still exists: Example: https://upload.wikimedia.org/wikipedia/commons/d/d3/Elephants_Dream_%282006%29.120p.vp9.opus.multichannel.webm No downsampling occurs and video playback fails. Because canPlayType passes, no fallback can occur to another source (like webm vp8, vorbis) either, creating a broken experience for the user. This is unfortunate as multichannel is supported by the format and it means that for Wikimedia we will now have to downsample all our derivatives/transcodes to stereo, if we do not want such files to break on macOS. This denies users of Chrome and Firefox the benefit of proper multichannel sound. Last tested on Safari 15.4 and STP 142, macOS 12.3 on a MacBook Pro from 2021. Wikimedia ticket: https://phabricator.wikimedia.org/T304624 1854994 7 jean-yves.avenard 2022-03-24 19:42:34 -0700 (In reply to Derk-Jan Hartman from comment #6) > This problem still exists: > Example: > https://upload.wikimedia.org/wikipedia/commons/d/d3/ > Elephants_Dream_%282006%29.120p.vp9.opus.multichannel.webm > It still exists because it hasn’t been fixed. The framework decoder unfortunately lacks the ability to decode more than 2 channels file 1994762 8 ap 2023-11-25 13:53:33 -0800 *** Bug 241220 has been marked as a duplicate of this bug. *** 2181102 9 jean-yves.avenard 2026-02-12 21:33:53 -0800 Pull request: https://github.com/WebKit/WebKit/pull/58593 2187556 10 ews-feeder 2026-03-05 15:01:57 -0800 Committed 308749@main (4bf9354c493c): <https://commits.webkit.org/308749@main> Reviewed commits have been landed. Closing PR #58593 and removing active labels. 437580 2021-09-07 19:19:20 -0700 2021-09-07 19:19:20 -0700 Patch bug-229325-20210908121919.patch text/plain 24887 jean-yves.avenard U3VidmVyc2lvbiBSZXZpc2lvbjogMjgxNTQ5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNjFhZGZiODZjYTVkNWU3 MjIzYzkwYTdiMTQ3NTBjOTg3MzAxODNkOC4uNGIxYzM5YTk4YmI2M2RkMzhiN2Q0OWU0MzFlNzE1 NWI2NmMxZGNlZCAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDMzIEBACisyMDIxLTA5LTA3ICBKZWFu LVl2ZXMgQXZlbmFyZCAgPGp5YUBhcHBsZS5jb20+CisKKyAgICAgICAgRGVjb2Rpbmcgd2VibSBm aWxlIHdpdGggbW9yZSB0aGFuIDIgY2hhbm5lbHMgd2lsbCBmYWlsCisgICAgICAgIGh0dHBzOi8v YnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMjkzMjUKKworICAgICAgICBSZXZpZXdl ZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBXSVA7IHRoaXMgdGhlb3JldGljYWxseSBo YXMgZXZlcnl0aGluZyB0byBkZWNvZGUgbXVsdGktY2hhbm5lbHMgdm9yYmlzIGFuZCBvcHVzLgor 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