[Bug 764874] New: [VC1][decode]Filter caps do not completely specify the output format

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764874

            Bug ID: 764874
           Summary: [VC1][decode]Filter caps do not completely specify the
                    output format
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: fei.w.wang at intel.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

1. Testing Steps:
========================================================================
gst-launch-1.0 -q filesrc location=/media/HEVC/JVT10.0/$filename ! h265parse !
vaapidecode ! vaapipostproc format=i420 ! checksumsink2 frame-checksum=FALSE
file-checksum=TRUE | tail -1 >> file_checksum_vaapi.txt

2. error log:
root at x-kbl01:~/media_tools/decoder/bitstreams_vc1#
LD_PRELOAD=/opt/X11R7/lib/libva.so:/GFX/Test/Infrastructure/infrastructure/tests/media_tools/i965_drv_video_hook_op.so
gst-launch-1.0 filesrc
location=/root/media_tools/decoder/bitstreams_vc1/SA00040.vc1 '!'
'video/x-wmv,profile=(string)advanced,' width=176, height=144 '!' vaapidecode
'!' vaapisink sync=false libva info: VA-API version 0.39.0 libva info:
va_getDriverName() returns 0 libva info: Trying to open
/opt/X11R7/lib/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_39 libva info: va_openDriver()
returns 0 Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Got context from element 'pipeline0': gst.vaapi.Display=context,
gst.vaapi.Display=(GstVaapiDisplay)NULL;
ERROR: from element /GstPipeline:pipeline0/GstCapsFilter:capsfilter0: Filter
caps do not completely specify the output format Additional debug info:
gstcapsfilter.c(455): gst_capsfilter_prepare_buf ():
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0:
Output caps are unfixed: video/x-wmv, width=(int)176, height=(int)144,
framerate=(fraction)[ 0/1, 2147483647/1 ], wmvversion=(int)3,
format=(string)WVC1, profile=(string)advanced
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...


3. Testing Env:
========================================================================
gst_plugins_vaapi:   (master)506c9e2b5bbc50730b0083598b346b0fcc41ec78
libva:               (master)2339d10b9a39ba4f7173053b9eab8d6a151717a5 
Libva_intel_driver:  (master)2c1bec03889fe759a33c087a7c107ad84bbb72fb

3. Frequency of Occurence:
========================================================================
100%

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