237780 2022-03-11 06:38:41 -0800 [MSE][SourceBuffer] Fix removal of paddings from buffered range 2022-03-14 06:23:17 -0700 1 1 1 Unclassified WebKit Media WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 eocanha eocanha calvaris eric.carlson ews-watchlist glenn jer.noble philipj sergio webkit-bug-importer oldest_to_newest 1850494 0 eocanha 2022-03-11 06:38:41 -0800 This change fixes high memory usage in apps that do TS -> MP4 transmuxing. The high memory usage is observed in some streams that have a slight overlap in media samples (usually happens on video quality change), when application applies its own logic for samples removal (that looks like sourceBuffer.remove(sourceBuffer.buffered.start(0), ...)). Current implementation reports a buffered range that is inconsistent with the actual samples that are still in the buffer (after range removal). The reported range excludes one sample, allowing that sample to "leak". Such a sample holds a reference to the entire appended chunk (due to in-place demuxing in GStreamer MSE backend), but it accounts only for a small size in the buffer. So eviction algorithm doesn't kick in. See the full discussion of this problem here: https://github.com/WebPlatformForEmbedded/WPEWebKit/pull/797#discussion_r818973424 1850547 1 454492 eocanha 2022-03-11 09:56:29 -0800 Created attachment 454492 Patch 1850549 2 454492 jer.noble 2022-03-11 10:05:15 -0800 Comment on attachment 454492 Patch Thanks for the patch, and thanks for working with me on it in the WPEWebKit repo. r=me once the EWS clears it. 1850553 3 eocanha 2022-03-11 10:11:42 -0800 All the merit goes to Eugene, not to me. He took the time to debug and solve the issue, as well as creating the test case. I just ported it. 1850843 4 eocanha 2022-03-14 05:52:56 -0700 The editing/spelling/spellcheck-api-crash.html failed test in the ios-wk2 EWS is completely unrelated to MSE and to the changes done in this patch. Also "MediaSource is not currently supported on iOS". I'm assuming that I can ignore it and safely land the patch. 1850845 5 ews-feeder 2022-03-14 06:22:54 -0700 Committed r291225 (248380@main): <https://commits.webkit.org/248380@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 454492. 1850846 6 webkit-bug-importer 2022-03-14 06:23:17 -0700 <rdar://problem/90243150> 454492 2022-03-11 09:56:29 -0800 2022-03-14 06:22:56 -0700 Patch bug-237780-20220311185627.patch text/plain 8577 eocanha U3VidmVyc2lvbiBSZXZpc2lvbjogMjkwODgzCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNTU5MjBmZjdkZWZhZjkx ODYwODZhYTViN2I0ODg4Yzk1NjNmNWM1Mi4uNWJkNmZjMjc1Y2ZkMWZiZDIwMGY4OGI4NmY2OWZj MDA1YzRjNjkwYSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI3IEBACisyMDIyLTAzLTExICBFbnJp cXVlIE9jYcOxYSBHb256w6FsZXogIDxlb2NhbmhhQGlnYWxpYS5jb20+CisKKyAgICAgICAgW01T RV1bU291cmNlQnVmZmVyXSBGaXggcmVtb3ZhbCBvZiBwYWRkaW5ncyBmcm9tIGJ1ZmZlcmVkIHJh bmdlCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMzc3 ODAKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBXaGVu 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