[Bug 796465] New: msdk: the mirroring vpp fail at vertical direction

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796465

            Bug ID: 796465
           Summary: msdk: the mirroring vpp fail at vertical direction
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zhanjunx.wang at intel.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Test Env:
============================================
Platform:               APL/KBL/SKL
Arch:                  x86_64
Linux release           16.04
Kernel:            4.12.0-rc2 
libva                   https://github.com/01org/libva.gitb
                        commit 3be72a5a110880f70626d7c3bed953cdde124b2
media_driver        https://github.com/intel/media-driver
                        commit 1c2b0615d749c45c07f9aee6586774816989c5b3
MediaSDK:               https://github.com/Intel-Media-SDK/MediaSDK
                        commit 7c2b069dce7bed268806f680412a2f3b09a52ce9
gst-bad         master branch 0bdcf51baf77926b4f29c01a2fdf133c13aad62e

Reproduce Steps:
============================================
take one case for example
1. build enc as above lists
2. gst-launch-1.0 filesrc location=/media/gst_msdk_vpp_ref/768x480.I420 '!'
videoparse format=i420 width=768 height=480 framerate=1 '!' videoconvert '!'
video/x-raw,format=NV12 '!' msdkvpp mirroring=2 '!' videoconvert '!'
video/x-raw,format=I420 '!' checksumsink2 frame-checksum=false dump-output=true
dump-location=mirroring2.I420
3. error message occurs as below
ERROR                msdkvpp gstmsdkvpp.c:904:gst_msdkvpp_initialize:<msdkvpp0>
VPP Query IO surfaces failed (undeveloped feature)

** (gst-launch-1.0:19228): CRITICAL **: gst_msdk_video_allocator_new: assertion
'context != NULL' failed

(gst-launch-1.0:19228): GStreamer-CRITICAL **: gst_buffer_pool_get_config:
assertion 'GST_IS_BUFFER_POOL (pool)' failed

(gst-launch-1.0:19228): GStreamer-CRITICAL **:
gst_buffer_pool_config_get_params: assertion 'config != NULL' failed

(gst-launch-1.0:19228): GStreamer-CRITICAL **:
gst_buffer_pool_config_get_allocator: assertion 'config != NULL' failed

(gst-launch-1.0:19228): GStreamer-CRITICAL **: gst_structure_free: assertion
'structure != NULL' failed

** (gst-launch-1.0:19228): CRITICAL **: gst_msdk_video_allocator_new: assertion
'context != NULL' failed

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