Test elements_h264parse.test_parse_packetized is currently failling

Sadly not much more information apart from this log, fails both locally and on CI. Tested with fedora 29, and as of b907187a

cc @ndufresne

Tested from a gst-build checkout with the following command:

./gst-uninstalled.py gst-validate-launcher check.gst-plugins-bad.elements_h264parse.test_parse_packetized -fs --mute --dump-on-failure --no-display --meson-no-rebuild

check.gst-plugins-bad.elements_h264parse.test_parse_packetized: Failed 'Application returned 1'
       You can reproduce with: CK_DEFAULT_TIMEOUT='20' DISPLAY=':0' GST_CHECKS='test_parse_packetized' GST_STATE_IGNORE_ELEMENTS='' GST_PLUGIN_SYSTEM_PATH_1_0='' GST_REGISTRY='/home/alatiera/centricular/gst-build/build/subprojects/gst-plugins-bad/tests/check/elements_h264parse.registry' GST_PLUGIN_PATH_1_0='/home/alatiera/centricular/gst-build/build' /home/alatiera/centricular/gst-build/build/subprojects/gst-plugins-bad/tests/check/elements_h264parse

Dumping log files on failure

Dumping contents of /home/alatiera/centricular/gst-build/validate-output/logs/check/gst-plugins-bad/elements_h264parse/test_parse_packetized

=================
Test name: check.gst-plugins-bad.elements_h264parse.test_parse_packetized
Command: '/home/alatiera/centricular/gst-build/build/subprojects/gst-plugins-bad/tests/check/elements_h264parse'
=================

Running suite(s): h264parse_to_bs_nal
100%: Checks: 0, Failures: 0, Errors: 0
Check suite h264parse_to_bs_nal ran in 0.000s (tests failed: 0)
Running suite(s): h264parse_to_bs_au
100%: Checks: 0, Failures: 0, Errors: 0
Check suite h264parse_to_bs_au ran in 0.000s (tests failed: 0)
Running suite(s): h264parse_to_avc_au
100%: Checks: 0, Failures: 0, Errors: 0
Running suite(s): h264parse_to_avc3_au
100%: Checks: 0, Failures: 0, Errors: 0
Check suite h264parse_to_avc3_au ran in 0.000s (tests failed: 0)
Running suite(s): h264parse_packetized
0%: Checks: 1, Failures: 1, Errors: 0
../subprojects/gst-plugins-bad/tests/check/elements/parser.c:278:F:general:test_parse_packetized:0: 'g_list_length (buffers) - test->discard' (18) is not equal to 'frames' (20)
Check suite h264parse_packetized ran in 0.012s (tests failed: 1)