227864 2021-07-11 19:35:19 -0700 [MSE] sequence mode is broken if GPU Process is enabled 2021-07-15 19:07:56 -0700 1 1 1 Unclassified WebKit Media WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 jean-yves.avenard jean-yves.avenard calvaris eric.carlson ews-watchlist glenn jer.noble philipj sergio webkit-bug-importer oldest_to_newest 1776244 0 jean-yves.avenard 2021-07-11 19:35:19 -0700 if sequence mode is explicitly set, or if generate timestamps flag is true (such as when using MSE with raw mpeg audio or aac) each time you call SourceBuffer.appendBuffer the timestampOffset will be amended. However, if the GPU Process is enabled, then the value of the timestamp offset is only updated in the GPU Process. If we read the value in the web content process, this value will always be 0. 1776245 1 webkit-bug-importer 2021-07-11 19:35:46 -0700 <rdar://problem/80445041> 1776906 2 jean-yves.avenard 2021-07-14 03:39:32 -0700 Fly-by notice: In the spec we read: 3.5.8 Coded Frame Processing [...] 3.5.8.3 If mode equals "sequence" and group start timestamp is set, then run the following steps: 1. Set timestampOffset equal to group start timestamp - presentation timestamp. 2. Set group end timestamp equal to group start timestamp. 3. Set the need random access point flag on all track buffers to true. 4, Unset group start timestamp. But in the code we do: https://webkit-search.igalia.com/webkit/rev/d08a57141296609b7f8a171e989aa141afa12244/Source/WebCore/platform/graphics/SourceBufferPrivate.cpp#891-892 // 1.3.1 Set timestampOffset equal to group start timestamp - presentation timestamp. m_timestampOffset = m_groupStartTimestamp; m_timestampOffset isn't set properly here. 1776909 3 433495 jean-yves.avenard 2021-07-14 04:01:54 -0700 Created attachment 433495 Patch 1777408 4 ews-feeder 2021-07-15 19:07:54 -0700 Committed r279973 (239716@main): <https://commits.webkit.org/239716@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 433495. 433495 2021-07-14 04:01:54 -0700 2021-07-15 19:07:55 -0700 Patch bug-227864-20210714210153.patch text/plain 14212 jean-yves.avenard U3VidmVyc2lvbiBSZXZpc2lvbjogMjc5Nzc1CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZWY1NzAzMGU1OTk2NzRh ZWZmOGFiN2RmMTBhZDRiZDRmMDA4NjBlZS4uMzJmNDk5YWNkNzJlMWI2ZWY1ZGUwMDFlOWJkNjBi ZTk1MzYzNDc4ZiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI4IEBACisyMDIxLTA3LTE0ICBKZWFu LVl2ZXMgQXZlbmFyZCAgPGp5YUBhcHBsZS5jb20+CisKKyAgICAgICAgW01TRV0gc2VxdWVuY2Ug bW9kZSBpcyBicm9rZW4gaWYgR1BVIFByb2Nlc3MgaXMgZW5hYmxlZAorICAgICAgICBodHRwczov L2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjI3ODY0CisgICAgICAgIDxyZGFyOi8v cHJvYmxlbS84MDQ0NTA0MT4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4K KworICAgICAgICBXaGVuIHRoZSBzb3VyY2UgYnVmZmVyJ3MgbW9kZSBpcyBzZXQgdG8gc2VxdWVu 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