splitmuxsrc: test_splitmuxsrc_sparse_streams is racy, 'Application returned 1'

check.gst-plugins-good.elements_splitmux.test_splitmuxsrc_sparse_streams: Failed 'Application returned 1'
       You can reproduce with: GST_REGISTRY='/builds/alatiera/gst-ci/gst-build/build/subprojects/gst-plugins-good/tests/check/elements_splitmux.registry' GST_CHECKS='test_splitmuxsrc_sparse_streams' GST_STATE_IGNORE_ELEMENTS='aasink autoaudiosrc autoaudiosink autovideosrc
 autovideosink cacasink cairotextoverlay jackaudiosrc jackaudiosink
 osssrc osssink osxaudiosink osxaudiosrc osxvideosrc osxvideosink
 pulsesink pulsesrc pulsemixer v4l2src' GST_PLUGIN_PATH_1_0='/builds/alatiera/gst-ci/gst-build/build' CK_DEFAULT_TIMEOUT='20' GST_PLUGIN_SYSTEM_PATH_1_0='' GST_PLUGIN_LOADING_WHITELIST='gstreamer:gst-plugins-base:gst-plugins-good@/builds/alatiera/gst-ci/gst-build/build' /builds/alatiera/gst-ci/gst-build/build/subprojects/gst-plugins-good/tests/check/elements_splitmux

Dumping log files on failure

Dumping contents of /builds/alatiera/gst-ci/validate-output/logs/check/gst-plugins-good/elements_splitmux/test_splitmuxsrc_sparse_streams

=================
Test name: check.gst-plugins-good.elements_splitmux.test_splitmuxsrc_sparse_streams
Command: '/builds/alatiera/gst-ci/gst-build/build/subprojects/gst-plugins-good/tests/check/elements_splitmux'
=================

Running suite(s): splitmux
0:00:00.181629644  9504 0x7efc500040a0 ERROR              theoradec gsttheoradec.c:538:theora_handle_type_packet:<theoradec0> Failed to negotiate
ERROR from element splitsrc: GStreamer encountered a general stream error.
Debugging info: ../subprojects/gst-plugins-good/gst/multifile/gstsplitmuxsrc.c(898): gst_splitmux_find_output_pad (): /GstPipeline:pipeline1/GstSplitMuxSrc:splitsrc:
Stream part /tmp/splitmux-test-RNDDVZ/out00001.ogg contains extra unknown pad <matroskademux1:subtitle_0>
ERROR from element splitsrc: GStreamer encountered a general stream error.
Debugging info: ../subprojects/gst-plugins-good/gst/multifile/gstsplitmuxsrc.c(898): gst_splitmux_find_output_pad (): /GstPipeline:pipeline1/GstSplitMuxSrc:splitsrc:
Stream part /tmp/splitmux-test-RNDDVZ/out00001.ogg contains extra unknown pad <matroskademux1:subtitle_0>
0%: Checks: 1, Failures: 1, Errors: 0
../subprojects/gst-plugins-good/tests/check/elements/splitmux.c:633:F:complex:test_splitmuxsrc_sparse_streams:0: Assertion 'GST_MESSAGE_TYPE (msg) == GST_MESSAGE_EOS' failed
Check suite splitmux ran in 0.155s (tests failed: 1)