The new test added in added in http://trac.webkit.org/changeset/70814, media/video-seek-by-small-increment.html, fails with the Qt port. This should be fixed by implementing mediaTimeForTimeValue.
Oh, http://trac.webkit.org/changeset/70814 was rolled out in http://trac.webkit.org/changeset/70837...
You can either add the Qt specific changes to https://bugs.webkit.org/show_bug.cgi?id=48612 or wait until it is resubmitted.
=== Bulk closing of Qt bugs ===
If you believe that this bug report is still relevant for a non-Qt port of webkit.org, please re-open it and remove [Qt] from the summary.
If you believe that this is still an important QtWebKit bug, please fill a new report at https://bugreports.qt-project.org and add a link to this issue. See http://qt-project.org/wiki/ReportingBugsInQt for additional guidelines.