[FFmpeg-trac] #7375(avdevice:new): kmsgrab not working on AMD cards

[FFmpeg]

#7375: kmsgrab not working on AMD cards
------------------------------------+--------------------------------------
             Reporter:  tildearrow  |                     Type:  defect
               Status:  new         |                 Priority:  normal
            Component:  avdevice    |                  Version:  git-master
             Keywords:  kmsgrab     |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+--------------------------------------
 Description:
 kmsgrab seems to not work on AMD cards, or at least the one I tested with.

 Steps to reproduce:
 {{{
 $ sudo ./ffmpeg -report -f kmsgrab -device /dev/dri/card1 -i - -vf
 'hwdownload,format=bgr0' -c:v rawvideo -f avi -y /dev/null
 ffmpeg started on 2018-08-22 at 23:39:54
 Report written to "ffmpeg-20180822-233954.log"
 ffmpeg version N-91666-g70d2bab80b Copyright (c) 2000-2018 the FFmpeg
 developers
   built with gcc 8.2.0 (GCC)
   configuration: --disable-everything --enable-gpl --enable-libdrm
 --enable-indev=kmsgrab --enable-decoder=wrapped_avframe --enable-
 encoder=rawvideo --enable-filter=format --enable-filter=hwdownload
 --enable-protocol=file --enable-muxer=avi
   libavutil      56. 19.100 / 56. 19.100
   libavcodec     58. 24.101 / 58. 24.101
   libavformat    58. 17.103 / 58. 17.103
   libavdevice    58.  4.101 / 58.  4.101
   libavfilter     7. 26.100 /  7. 26.100
   libswscale      5.  2.100 /  5.  2.100
   libswresample   3.  2.100 /  3.  2.100
   libpostproc    55.  2.100 / 55.  2.100
 [kmsgrab @ 0x5557f5102a00] Using plane 41 to locate framebuffers.
 [kmsgrab @ 0x5557f5102a00] Template framebuffer is 95: 3840x2160 32bpp 24b
 depth.
 Input #0, kmsgrab, from 'pipe:':
   Duration: N/A, start: 1534999194.427423, bitrate: N/A
     Stream #0:0: Video: wrapped_avframe, drm_prime, 3840x2160, 30 tbr,
 1000k tbn, 1000k tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (wrapped_avframe (native) -> rawvideo (native))
 [AVHWFramesContext @ 0x5557f5105980] Failed to map DRM object 5 to memory:
 1.
 [hwdownload @ 0x5557f5113900] Failed to download frame: -1.
 Error while filtering: Operation not permitted
 Failed to inject frame into filter network: Operation not permitted
 Error while processing the decoded data for stream #0:0
 Conversion failed!
 }}}
 Additional information:
 Attached FFmpeg log.

 No extra messages in the kernel log have been generated.

 This may actually be a problem in amdgpu rather than FFmpeg, but I am not
 sure.

 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

 System specifications:
 {{{
 CPU:       Quad core Intel Core i7-6700K (-MT-MCP-) cache: 8192 KB
            clock speeds: max: 4001 MHz 1: 4050 MHz 2: 4025 MHz 3: 4000 MHz
 4: 4095 MHz 5: 4001 MHz
            6: 4004 MHz 7: 4063 MHz 8: 4015 MHz
 Graphics:  Card-1: Intel HD Graphics 530
            Card-2: Advanced Micro Devices [AMD/ATI] Vega 10 XTX [Radeon
 Vega Frontier Edition]
            Display Server: x11 (X.Org 1.20.0 ) driver: modesetting
 Resolution: 3840x2160
            OpenGL: renderer: Radeon Vega Frontier Edition (VEGA10, DRM
 3.26.0, 4.18.3-zen1-1-zen, LLVM 6.0.1)
            version: 4.5 Mesa 18.1.6
 }}}
 uname -a:
 {{{
 Linux linux 4.18.3-zen1-1-zen #1 ZEN SMP PREEMPT Sat Aug 18 09:23:50 UTC
 2018 x86_64 GNU/Linux
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7375>
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