[Bug 783726] vaapi: failure of some tcs in gst-validate-launcher

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783726

--- Comment #1 from Hyunjun Ko <zzoon at igalia.com> ---
Also, you can reproduce by just doing some seek of that media.

gst-play-1.0
///home/zzoon/gst-validate/gst-integration-testsuites/medias/defaults/matroska/test5.mkv

This is because there happens the case that no reference frame yet when it
tries to decode slice after all status in decoder is refreshed in reset during
seek.

Normally, after seek it just skip fill_picture_gaps since frame number is
followed by previous frame number.
But in this case, frame number after seek jumped to higher, which means there's
gap between prev frame number and current frame number. Then it starts trying
to fill gap of pictures but it failed due to no previous ref frame.

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