playback:playbin3 can't load external srt subtitle(playbin2 ok)
ubuntu 18.04 + master 1.15.90
Playbin3 can't load external .srt:
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GST_DEBUG_COLOR_MODE=off GST_DEBUG=6 GST_DEBUG_FILE='/home/shakin/Desktop/log/gst_playbin3_ng.log' GST_DEBUG_DUMP_DOT_DIR='/home/shakin/Desktop/log' gst-launch-1.0 playbin3 uri=file:///home/shakin/Desktop/big_buck_bunny_1080p_surround_176_144_2.mp4 suburi=file:///home/shakin/Desktop/sample.srt
but,following display subtitles properly:
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GST_DEBUG_COLOR_MODE=off GST_DEBUG=6 GST_DEBUG_FILE='/home/shakin/Desktop/log/gst_playbin2_ok.log' GST_DEBUG_DUMP_DOT_DIR='/home/shakin/Desktop/log' gst-launch-1.0 playbin uri=file:///home/shakin/Desktop/big_buck_bunny_1080p_surround_176_144_2.mp4 suburi=file:///home/shakin/Desktop/sample.srt
log and test files are attached：
playbin3_load_external_src_failed.zip