[Bug 772259] decoder: h265 : Failing to play a stream occasionally

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772259

--- Comment #2 from Lim Siew Hoon <siew.hoon.lim at intel.com> ---
I'm having consistent assertion on the encode stream from h265 with
matroskamux. I'm using the gstreamer-vaapi 1.8.3 version. 

command:
1. h265 encode command:
gst-launch-1.0 filesrc location=/home/root/iceage_720x480_491.yuv ! videoparse
width=720 format=i420 framerate=30 height=480 ! vaapih265enc rate-control=cqp !
video/x-h265,profile=main ! h265parse ! matroskamux ! fpsdisplaysink
video-sink="filesink location=/home/root/test.mkv" text-overlay=false

2. h265 decode command:
gst-launch-1.0 filesrc location=/home/root/test.mkv ! matroskademux ! h265parse
! vaapidecode ! vaapisink

The raw stream encoded by using vaapih265enc + matroskamux, the replay back the
h265 video stream, it will hitting error assertion causing in gen9_mfd.c:587:
gen9_hcpd_get_reference_picture_frame_id: Assertion `0' failed.
Aborted (core dumped)

Found out the after revert this commit     id:
dc35dafa1d2d320da0ef8750233e1bf5dec747cc, it is working fine. 

I'm trying just changed from "encoder->cts_offset = GST_CLOCK_TIME_NONE" back
to "encoder->cts_offset = 0", it is working fine. 
GST_CLOCK_TIME_NONE is -1 value.

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