(In reply to mikhail.v.gavrilov from comment #8)
> Created attachment 139581 [details]
> mpv verbose info for h264

[vd] Using software decoding.
Also hardware acceleration not used for h264 why?

$ gst-inspect-1.0 vaapi
Plugin Details:
  Name                     vaapi
  Description              VA-API based elements
  Filename                 /usr/lib64/gstreamer-1.0/libgstvaapi.so
  Version                  1.14.0
  License                  LGPL
  Source module            gstreamer-vaapi
  Source release date      2018-03-19
  Binary package           gstreamer-vaapi
  Origin URL              
http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer

  vaapimpeg2dec: VA-API MPEG2 decoder
  vaapih264dec: VA-API H264 decoder
  vaapivc1dec: VA-API VC1 decoder
  vaapih265dec: VA-API H265 decoder
  vaapipostproc: VA-API video postprocessing
  vaapidecodebin: VA-API Decode Bin
  vaapisink: VA-API sink
  vaapih265enc: VA-API H265 encoder
  vaapih264enc: VA-API H264 encoder

  9 features:
  +-- 9 elements