311519 2026-04-05 03:55:09 -0700 REGRESSION(310393@main): [WPE][GTK] Broke GStreamer 1.28 video rendering for software video decoders 2026-04-06 07:00:14 -0700 1 1 1 Unclassified WebKit Platform WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=311251 InRadar P2 Normal --- 1 philn philn bugs-noreply webkit-bug-importer zimmermann oldest_to_newest 2197019 0 philn 2026-04-05 03:55:09 -0700 At least with GStreamer 1.28 where glupload uses the udmabuf allocator. I haven't checked with 1.26 yet. Repro: WEBKIT_DISABLE_SANDBOX_THIS_IS_DANGEROUS=1 GST_PLUGIN_FEATURE_RANK=vah264dec:0 run-minibrowser --gtk file://$PWD/LayoutTests/media/content/test.mp4 Here YU12 (DRM_FORMAT_YUV420) is negotiated on the video sink. importYUV() fails due to a importToTexture() call returning nullptr. Only a couple video frames are rendered, there is a lot of flickering. 2197207 1 philn 2026-04-06 02:33:31 -0700 This isn't an issue in 1.26 because for that scenario the sink negotiates video/x-raw(memory:GLMemory),format=I420 so not DMABuf... 2197216 2 philn 2026-04-06 04:14:54 -0700 Pull request: https://github.com/WebKit/WebKit/pull/62111 2197237 3 ews-feeder 2026-04-06 06:59:37 -0700 Committed 310641@main (22a068588490): <https://commits.webkit.org/310641@main> Reviewed commits have been landed. Closing PR #62111 and removing active labels. 2197238 4 webkit-bug-importer 2026-04-06 07:00:14 -0700 <rdar://problem/174158092>