How to do hardware decoding of video?

[SuperSaiyanCaleb]

So finally had a chance to do some experimenting on this this weekend.  Followed the instructions in videoplayback notes when using ayufan's LXDE Bionic build, and when I attempt to play a file using rkmpv, I get a black screen, and this on the console:

Code:

Playing: test.mkv (+) Video --vid=1 (*) (hevc 1920x1080 23.976fps) (+) Audio --aid=1 --alang=eng (*) 'Surround' (aac 6ch 48000Hz)     Audio --aid=2 --alang=eng 'Stereo' (aac 2ch 48000Hz)     Audio --aid=3 --alang=fre 'Stereo' (aac 2ch 48000Hz)     Audio --aid=4 --alang=spa 'Stereo' (aac 2ch 48000Hz)     Subs  --sid=1 --slang=eng (hdmv_pgs_subtitle)     Subs  --sid=2 --slang=fre (hdmv_pgs_subtitle)     Subs  --sid=3 --slang=spa (hdmv_pgs_subtitle)     Subs  --sid=4 --slang=spa (hdmv_pgs_subtitle)     Subs  --sid=5 --slang=por (hdmv_pgs_subtitle)     Subs  --sid=6 --slang=pol (hdmv_pgs_subtitle)     Subs  --sid=7 --slang=dut (hdmv_pgs_subtitle)     Subs  --sid=8 --slang=dan (hdmv_pgs_subtitle)     Subs  --sid=9 --slang=fin (hdmv_pgs_subtitle)     Subs  --sid=10 --slang=nor (hdmv_pgs_subtitle)     Subs  --sid=11 --slang=swe (hdmv_pgs_subtitle) (+) Subs  --sid=12 --slang=eng (*) (hdmv_pgs_subtitle) [vo/gpu] VT_GETMODE failed: Inappropriate ioctl for device [vo/gpu/opengl] Failed to set up VT switcher. Terminal switching will be unavailable. [vo/gpu/opengl] Could not choose EGLConfig! mpi: mpp version: Without VCS, under bleeding AO: [pulse] 48000Hz 5.1 6ch float H265D_PARSER: No start code is found. Using hardware decoding (rkmpp). VO: [gpu] 1920x1080 drm_prime [vo/gpu] Using HW-overlay mode. No GL filtering is performed on the video! [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000 [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0. AV: 00:00:00 / 01:01:37 (0%) A-V:  0.000

The failed framebuffer errors continue to print, with time indices gradually increasing, so the file appears to be "playing", only there is no video output.