[Webkit-unassigned] [Bug 225765] [GStreamer] Another crash under gst_element_add_pad

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225765

--- Comment #9 from Michael Catanzaro <mcatanzaro at gnome.org> ---
This was... hard. I built a modified runtime with WebKit, following the instructions at https://gitlab.gnome.org/GNOME/gnome-build-meta/-/blob/master/README.rst. (Yes, it appears that I wrote those instructions, but I really just copied them from somewhere.) I couldn't figure out how to run it with an application, so had to rebuild the runtime to enable -DMINIBROWSER=ON because we have that off by default for some reason. Eventually I figured out the incantation to make MiniBrowser work:

$ flatpak run --command=/bin/bash -d --socket=wayland --device=dri --share=ipc --share=network --socket=pulseaudio --filesystem=home org.gnome.Platform
[�� org.gnome.Platform ~]$ export GST_DEBUG="3,webkit*:6" GST_DEBUG_FILE="$HOME/gst.log" GST_DEBUG_NO_COLOR=1 WEBKIT_FORCE_SANDBOX=0
[�� org.gnome.Platform ~]$ /usr/libexec/webkit2gtk-4.0/MiniBrowser https://www.warbyparker.com/eyeglasses/lenses
collection: 0x7f4e8c01c030 owner: decodebin3-0

** (WebKitWebProcess:160): WARNING **: 19:45:08.074: Warning: 11, not negotiated. Debug output: ../libs/gst/base/gstbasetransform.c(1423): gst_base_transform_reconfigure (): /GstPipeline:image-decoder-0/GstDecodebin3:decodebin3-0/GstParseBin:parsebin0/GstCapsFilter:capsfilter0:
not negotiated

** (WebKitWebProcess:160): WARNING **: 19:45:08.075: Error: 1, Internal data stream error.. Debug output: ../gst/isomp4/qtdemux.c(6619): gst_qtdemux_loop (): /GstPipeline:image-decoder-0/GstDecodebin3:decodebin3-0/GstParseBin:parsebin0/GstQTDemux:qtdemux0:
streaming stopped, reason not-negotiated (-4)

** (MiniBrowser:3): WARNING **: 19:45:09.510: WebProcess CRASHED

I'll attach the gst.log it produced as well, though I guess you probably don't need it, since in theory it should match the original log more or less? Except note that OpenH264 isn't present here (it's only present in my system install, but I followed the instructions to use my user install). Anyway, the most important point was the debug you requested: collection: 0x7f4e8c01c030 owner: decodebin3-0. It took several hours to get that, so I hope it was worth it. :P

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