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Created by Martin Mareš@mmrmartin

Seek forward breaks playback on some H.265 MKVs

If I play some Matroska H.265 videos from start everything works fine but if I use seek forward (or choose any point in the timeline) playback stops and video freeze on the last frame before seeking. It acts as if the video was paused but I cannot resume it.

Seeking forward works fine in VLC (I can see hardware video acceleration in intel_gpu_top). I can seek forward with H.264 videos through gstreamer as well.

Most of my videos have that issue, I found an H.265 1080p (medium bitrate) demo mkv that acts similarly but here it does not freeze in every case. You must seek more that one minute soon after video starts. gst-play-1.0 H.265\ HVEC\ Test\ 1.mkv and then right arrow on the keyboard works probably best to reproduce this issue.

Logs

gst-discoverer-1.0 video.mkv 
Topology:
  container: Matroska
    subtitles: PGS subtitles
    audio: MPEG-4 AAC
    video: H.265 (Main Profile)
Properties:
Duration: 0:22:58.368000000
Seekable: yes
Live: no
Tags:
title: S01E01
container format: Matroska
language code: en
audio codec: MPEG-4 AAC audio
bitrate: 128457
extended comment: DURATION=00:22:58.368000000
video codec: HEVC

output of GST_DEBUG=vaapi*:5,*:4 gst-play-1.0 movie.mkv

vainfo 
libva info: VA-API version 1.7.0
libva info: Trying to open /usr/lib64/dri/iHD_drv_video.so
libva info: va_openDriver() returns -1
libva info: Trying to open /usr/lib64/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_1_5
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.7 (libva 2.7.1)
vainfo: Driver version: Intel i965 driver for Intel(R) Coffee Lake - 2.4.0
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            :	VAEntrypointVLD
      VAProfileMPEG2Simple            :	VAEntrypointEncSlice
      VAProfileMPEG2Main              :	VAEntrypointVLD
      VAProfileMPEG2Main              :	VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline:	VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:	VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline:	VAEntrypointEncSliceLP
      VAProfileH264Main               :	VAEntrypointVLD
      VAProfileH264Main               :	VAEntrypointEncSlice
      VAProfileH264Main               :	VAEntrypointEncSliceLP
      VAProfileH264High               :	VAEntrypointVLD
      VAProfileH264High               :	VAEntrypointEncSlice
      VAProfileH264High               :	VAEntrypointEncSliceLP
      VAProfileH264MultiviewHigh      :	VAEntrypointVLD
      VAProfileH264MultiviewHigh      :	VAEntrypointEncSlice
      VAProfileH264StereoHigh         :	VAEntrypointVLD
      VAProfileH264StereoHigh         :	VAEntrypointEncSlice
      VAProfileVC1Simple              :	VAEntrypointVLD
      VAProfileVC1Main                :	VAEntrypointVLD
      VAProfileVC1Advanced            :	VAEntrypointVLD
      VAProfileNone                   :	VAEntrypointVideoProc
      VAProfileJPEGBaseline           :	VAEntrypointVLD
      VAProfileJPEGBaseline           :	VAEntrypointEncPicture
      VAProfileVP8Version0_3          :	VAEntrypointVLD
      VAProfileVP8Version0_3          :	VAEntrypointEncSlice
      VAProfileHEVCMain               :	VAEntrypointVLD
      VAProfileHEVCMain               :	VAEntrypointEncSlice
      VAProfileHEVCMain10             :	VAEntrypointVLD
      VAProfileHEVCMain10             :	VAEntrypointEncSlice
      VAProfileVP9Profile0            :	VAEntrypointVLD
      VAProfileVP9Profile0            :	VAEntrypointEncSlice
      VAProfileVP9Profile2            :	VAEntrypointVLD
gst-inspect-1.0 vaapi 
Plugin Details:
  Name                     vaapi
  Description              VA-API based elements
  Filename                 /usr/lib64/gstreamer-1.0/libgstvaapi.so
  Version                  1.16.2
  License                  LGPL
  Source module            gstreamer-vaapi
  Source release date      2019-12-03
  Binary package           gstreamer-vaapi
  Origin URL               http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer
vaapijpegdec: VA-API JPEG decoder
vaapimpeg2dec: VA-API MPEG2 decoder
vaapih264dec: VA-API H264 decoder
vaapivc1dec: VA-API VC1 decoder
vaapivp8dec: VA-API VP8 decoder
vaapivp9dec: VA-API VP9 decoder
vaapih265dec: VA-API H265 decoder
vaapipostproc: VA-API video postprocessing
vaapidecodebin: VA-API Decode Bin
vaapisink: VA-API sink
vaapimpeg2enc: VA-API MPEG-2 encoder
vaapih265enc: VA-API H265 encoder
vaapivp8enc: VA-API VP8 encoder
vaapivp9enc: VA-API VP9 encoder
vaapijpegenc: VA-API JPEG encoder
vaapih264enc: VA-API H264 encoder
16 features:
+-- 16 elements