I try to add metadata (description, title, keywords) to a few videos. In order to be sure that I add the correct data, I view the respective video before actually entering metadata. After a few videos (sometimes three, sometimes five), digikam reliably crashes with/after an assertion !xcb_xlib_threads_sequence_lost. ("digikam: xcb_io.c:274: poll_for_event: Zusicherung »!xcb_xlib_threads_sequence_lost« nicht erfüllt.") On stdout/stderr, I get the following messages: ** (digikam:30930): WARNING **: gstvideo: failed to get caps of pad xvimagesink0:sink ** (digikam:30930): WARNING **: gstvideo: failed to get caps of pad xvimagesink0:sink [xcb] Unknown sequence number while processing queue [xcb] Most likely this is a multi-threaded client and XInitThreads has not been called [xcb] Aborting, sorry about that. digikam: xcb_io.c:274: poll_for_event: Zusicherung »!xcb_xlib_threads_sequence_lost« nicht erfüllt. Reproducible: Always Steps to Reproduce: 1. View a few videos. 2. Edit their metadata (title, comments) 3. go to 1. Actual Results: Digikam crashes with: [xcb] Unknown sequence number while processing queue [xcb] Most likely this is a multi-threaded client and XInitThreads has not been called [xcb] Aborting, sorry about that. digikam: xcb_io.c:274: poll_for_event: Zusicherung »!xcb_xlib_threads_sequence_lost« nicht erfüllt. Expected Results: Digikam does not crash.
XCB are not relevant of digiKam. It's another in-deep problem from your installation. In all case, if there is a digiKAm crash, getting a GDB backtrace must provide advanced information to hack. Read this page for details : http://www.digikam.org/contrib Gilles Caulier
New digiKam 4.11.0 is available with official PKG installer for OSX. https://www.digikam.org/node/740 Can you reproduce the problem with this release ? Gilles Caulier
This bug seems to have gone with Digikam 4.9.0 as shipped with OpenSUSE Tumbleweed.