Missing dependency: playbin

[asajeffrey]

Running on linux, wtih gstreamer in support/linux:

$ ./mach run -d http://servo.org/ml-home
Could not stop player Backend("Missing dependency: playbin")

running with GST_DEBUG=6:

0:00:00.001264942 11361 0x563726235a00 DEBUG           GST_REGISTRY gstregistry.c:1631:scan_and_update_registry: scanning home plugins /home/ajeffrey/.local/share/gstreamer-1.0/plugins
0:00:00.001271036 11361 0x563726235a00 DEBUG           GST_REGISTRY gstregistry.c:1363:gst_registry_scan_path_internal:<registry0> scanning path /home/ajeffrey/.local/share/gstreamer-1.0/plugins
0:00:00.001317416 11361 0x563726235a00 DEBUG           GST_REGISTRY gstregistry.c:1367:gst_registry_scan_path_internal:<registry0> registry changed in path /home/ajeffrey/.local/share/gstreamer-1.0/plugins: 0
0:00:00.001323362 11361 0x563726235a00 DEBUG           GST_REGISTRY gstregistry.c:1659:scan_and_update_registry: scanning main plugins /opt/gst/lib/gstreamer-1.0
0:00:00.001328607 11361 0x563726235a00 DEBUG           GST_REGISTRY gstregistry.c:1363:gst_registry_scan_path_internal:<registry0> scanning path /opt/gst/lib/gstreamer-1.0
0:00:00.001337509 11361 0x563726235a00 DEBUG           GST_REGISTRY gstregistry.c:1367:gst_registry_scan_path_internal:<registry0> registry changed in path /opt/gst/lib/gstreamer-1.0: 0
0:00:00.001342456 11361 0x563726235a00 DEBUG           GST_REGISTRY gstregistry.c:1526:gst_registry_remove_cache_plugins:<registry0> removing cached plugins
0:00:00.001347073 11361 0x563726235a00 INFO            GST_REGISTRY gstregistry.c:1681:scan_and_update_registry: Registry cache has not changed

it's not scanning the right directories.

Setting GST_PLUGIN_SYSTEM_PATH=./support/linux/gstreamer/gst/lib/gstreamer-1.0/. Fixes it.

[asajeffrey]

IRC chat: https://mozilla.logbot.info/servo-media/20190913#c16614297

[asajeffrey]

Looks like the problem is that mach isn't setting env vars if it finds a recent enough gstreamer, even if that gstreamer is the one in support/linux.