[Bug 793265] vaapipostproc: NV12->I420 produces green lines

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793265

--- Comment #3 from VaL Doroshchuk <valkov at yandex.ru> ---
Original command
gst-launch-1.0 videotestsrc ! video/x-raw, format=NV12 ! vaapipostproc !
video/x-raw, format=I420 ! autovideosink
reproduces the issue on 1.8.3 ver and latest build from git 1.13.0.

May be it is related to gst_vaapipostproc_transform() where it calls 
ret = gst_vaapipostproc_process_vpp (trans, buf, outbuf);
(and gst_vaapi_surface_create_full() is called where fourcc for I420 is set.
attrib->value.value.i = va_format->fourcc; // if NV12 no green lines occur)

On 1.8.3 is not reproducible by
gst-launch-1.0 souphttpsrc
location=http://techslides.com/demos/sample-videos/small.mp4 ! qtdemux !
h264parse ! vaapidecode ! vaapipostproc ! video/x-raw, format=I420 !
xvimagesink

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