Applications depend on Gstreamer fails to decode video when gstreamer1-vaapi is install on wayland

Hardware

• GPU: amdgpu
• OS: Fedora 29
• DESKTOP Environtment: Gnome
• Session: Wayland

VAINFO

libva info: VA-API version 1.4.0
libva info: va_getDriverName() returns 0
libva info: User requested driver 'radeonsi'
libva info: Trying to open /usr/lib64/dri/radeonsi_drv_video.so
libva info: Found init function __vaDriverInit_1_3
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.4 (libva 2.4.0)
vainfo: Driver version: Mesa Gallium driver 18.2.8 for AMD STONEY (DRM 3.27.0, 4.20.8-200.fc29.x86_64, LLVM 7.0.0)
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            :	VAEntrypointVLD
      VAProfileMPEG2Main              :	VAEntrypointVLD
      VAProfileVC1Simple              :	VAEntrypointVLD
      VAProfileVC1Main                :	VAEntrypointVLD
      VAProfileVC1Advanced            :	VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:	VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:	VAEntrypointEncSlice
      VAProfileH264Main               :	VAEntrypointVLD
      VAProfileH264Main               :	VAEntrypointEncSlice
      VAProfileH264High               :	VAEntrypointVLD
      VAProfileH264High               :	VAEntrypointEncSlice
      VAProfileHEVCMain               :	VAEntrypointVLD
      VAProfileHEVCMain10             :	VAEntrypointVLD
      VAProfileJPEGBaseline           :	VAEntrypointVLD
      VAProfileNone                   :	VAEntrypointVideoProc

Steps to reproduce

Play any video on totem with gstreamer vaapi installed.

Expected result

Totem should play as non gstreamer applications plays/decodes using vaapi.

Actual Result

It shows a black window, and frozen.

gst-launch1 playbin plays just fine.

gst-launch1 logs

gst-launch-log.log <- this log is wrong, look for the other log in this issue.

Update

The issue is due to mesa-vaapi+wayland+GST_CAPS_FEATURE_META_GST_VIDEO_GL_TEXTURE_UPLOAD_META gstreamer-vaapi uses eglExportDRMImageMESA and mesa-vaapi does not support creating a surface from a gem buffer. But mesa-vaapi supports creating a surface from dmabuf so we need to make gstreamer-vaapi to use eglExportDMABUFImageMESA when gem is not supported.