262193 2023-09-27 09:10:41 -0700 [GStreamer][MSE] Push STREAM_COLLECTION event after flushing 2023-09-28 06:55:15 -0700 1 1 1 Unclassified WebKit Media WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 eocanha eocanha webkit-bug-importer oldest_to_newest 1980532 0 eocanha 2023-09-27 09:10:41 -0700 Flushing the playback pipeline when very first buffers are being pushed downstream causes STREAM_COLLECTION event to be dropped before reaching decodebin3. As a result playback never starts after flush (buffer push return not-linked). This happens on initial seek sometimes, when it is triggered at the same time that first buffers push. STREAM_COLLECTION is dropped by GstBaseParse element specificaly that is caching events and sending them with first frame. Unfortunately flushing will drop all pending events if first frame is not ready yet. See: https://github.com/WebPlatformForEmbedded/WPEWebKit/pull/1197 1980535 1 eocanha 2023-09-27 09:20:17 -0700 Pull request: https://github.com/WebKit/WebKit/pull/18285 1980946 2 ews-feeder 2023-09-28 06:54:51 -0700 Committed 268582@main (4c9c58364145): <https://commits.webkit.org/268582@main> Reviewed commits have been landed. Closing PR #18285 and removing active labels. 1980947 3 webkit-bug-importer 2023-09-28 06:55:15 -0700 <rdar://problem/116181141>