GST_VIDEO_DECODER_STREAM_LOCK (decoder) stucks inside gst_video_decoder_get_frame

[MaJin]

Hi all,
I used the following commands to decode HEVC file,
gst-launch-1.0 filesrc location="1.265" ! h265parse ! video/x-h265,stream-format=byte-stream ! avdec_h265 ! filesink location=265.yuv
but I found it stucks at GST_VIDEO_DECODER_STREAM_LOCK (decoder) inside gst_video_decoder_get_frame() when I debugged it.It seems to be caused by deadlock.
When I used gst-launch-1.0 filesrc location="1.265" ! h265parse ! video/x-h265,stream-format=byte-stream ! avdec_h265 max-threads=1 ! filesink location=265.yuv
the problem disappeared.
Can anyone explain it? Or is it a bug?
Thanks a lot,Jin 		 	   		  
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