flvmux: new test (test_rollover_timestamps) failed with valgrind
The test introduced here: 9feb3563
Failed with valgrind here: https://gitlab.freedesktop.org/hgr/gst-plugins-good/-/jobs/1709619
The test introduced here: 9feb3563
Failed with valgrind here: https://gitlab.freedesktop.org/hgr/gst-plugins-good/-/jobs/1709619