180643 2017-12-11 04:53:07 -0800 [MSE] SourceBuffer::provideMediaData() may remove sample from decode queue unexpectedly 2018-09-27 13:11:25 -0700 1 1 1 Unclassified WebKit Media WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 zhangququ aboya aboya commit-queue jer.noble webkit-bug-importer oldest_to_newest 1380172 0 zhangququ 2017-12-11 04:53:07 -0800 I found in some cases, a sample already in trackBuffer.decodeQueue could be removed unexpectedly when there is gap ahead of it. For example, if samples of the following ranges are already in the trackBuffer.decodeQueue, [0 .. 5.0) [10.0, ... 30.0) when SourceBuffer::provideMediaData() is called on such a decodeQueue, it may remove sample 10.0 (decode time) due to one second gap. Then, if the gap is filled (segment re-appended) later, it will enqueue samples from this decodeQueue but without sample 10.0. The problem usually happens after playback for a while, e.g. buffered [10.0, ... 30.0), then seeking to the beginning. During re-appending the first segments, provideMediaData() may remove sample 10.0. As the removed sample is usually a sync sample, it results in playback issue if the enqueued samples are sent to decoder (not flushed). I suggest to move the following removal code to be after the one-second gap checking: trackBuffer.decodeQueue.erase(trackBuffer.decodeQueue.begin()); How do you think? Thanks. Best Regards, Daniel ZHANG 1398069 1 aboya 2018-02-09 13:12:45 -0800 I think you are right. The sample should only be removed from the decodeQueue after it's certain that it will be enqueued to the decoders. (Or if a the entire decodeQueue has to be flushed because of a seek). 1463971 2 350964 aboya 2018-09-27 09:02:55 -0700 Created attachment 350964 Patch 1463974 3 aboya 2018-09-27 09:04:32 -0700 Better late than never, here is a patch including a test case. 1464086 4 350964 jer.noble 2018-09-27 12:29:00 -0700 Comment on attachment 350964 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=350964&action=review > LayoutTests/media/media-source/media-source-append-acb-no-frame-lost.html:42 > + let updateEnd = waitFor(sourceBuffer, 'updateend'); > + run('sourceBuffer.appendBuffer(initSegment)'); > + await updateEnd; Just a little nit: because events will never be fired before the current run-loop yields, it's safe to restructure this to: run('sourceBuffer.appendBuffer(initSegment)'); await waitFor(sourceBuffer, 'updateend'); (I wish we could go back in time and change appendBuffer(...) to return a Promise<void>.) 1464092 5 350986 aboya 2018-09-27 12:44:44 -0700 Created attachment 350986 Patch 1464102 6 350986 commit-queue 2018-09-27 13:10:35 -0700 Comment on attachment 350986 Patch Clearing flags on attachment: 350986 Committed r236566: <https://trac.webkit.org/changeset/236566> 1464103 7 commit-queue 2018-09-27 13:10:36 -0700 All reviewed patches have been landed. Closing bug. 1464104 8 webkit-bug-importer 2018-09-27 13:11:25 -0700 <rdar://problem/44840989> 350964 2018-09-27 09:02:55 -0700 2018-09-27 12:44:40 -0700 Patch bug-180643-20180927180254.patch text/plain 11028 aboya U3VidmVyc2lvbiBSZXZpc2lvbjogMjM2NTAwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggOWE1NDYxMjk2MjA1ZDgy M2VmMDQ3MzJiNGM5OWYxN2JlNjRlNDFiMy4uZmJlMzg2NmY4NGNiYzRjZGRlM2FmMjVjM2ViMDQ0 N2Q4NTkyNWUyZiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI1IEBACisyMDE4LTA5LTI3ICBBbGlj aWEgQm95YSBHYXJjw61hICA8YWJveWFAaWdhbGlhLmNvbT4KKworICAgICAgICBbTVNFXSBGaXgg dW53YW50ZWQgc2FtcGxlIGVyYXNlIGZyb20gdGhlIGRlY29kZSBxdWV1ZQorICAgICAgICBodHRw czovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTgwNjQzCisKKyAgICAgICAgUmV2 aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgVGVzdDogbWVkaWEvbWVkaWEtc291 cmNlL21lZGlhLXNvdXJjZS1hcHBlbmQtYWNiLW5vLWZyYW1lLWxvc3QuaHRtbAorCisgICAgICAg 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