[auser1989]

Proposed builds to check, oldest first:

#0501, 01-May-2019: Generic -- Release post (config/functions: add C++ compiler and linker flags to meson.conf; fixed: Resume bookmark would clear on player start failure)
#0321, 21-Mar-2019: Generic -- Release post (Fixed RTL8723BS detecting bluetooth devices; xf86-video-amd/intel: updates 19.0.1/6afed33; [Music]Show artist disambiguation text when picking which one to scrape; fix waiting for window close animation blocking JSON requests after SetFullScreen)
#0312, 12-Mar-2019: Generic -- Release post (New 5.0.1 kernel, hopefully improved AMD GPU support; latest AMD GPU firmware 18.50; samba: update to samba-4.9.5; fix live video seek issues with curl)
#0208, 09-Feb-2019: Generic -- Release post (Updated amdgpu, vega20 and Intel Bluetooth firmwares; add date to the log records)
#1214, 15-Dec-2018: Generic -- Release post (Update AMD CPU microcode, Vega 10/Vega 12 firmware to 18.50 release; tvheadend42: fix missing libgnutls.so.30)
  

Ok, I've checked each of the builds listed above, with HEVC-VAAPI enabled in each case, using the H.265 HVEC Test 1.mkv (242M) sample file; the problem file - http://ix.io/1JD3; and several other HEVC files created before and after 2nd May.

Consistant results: 
each build played the sample file H.265 HVEC Test 1.mkv (242M) correctly.
each build crashed while trying to play the problem file - http://ix.io/1JD3
each build played the HEVC files created before 2nd May correctly
each build crashed while trying to play HEVC files created after 2nd/3rd May - these are sourced from the same source as the problem file, so it could be something specific in the way that they are generated.

Let me know if you need more info.