Haven't had time to bisect, but I can't screengrab to mkv any more.
kmsgrab + playing with vsync etc. give the same error as this example, mp4 works OK.


ffm -loglevel debug -vaapi_device /dev/dri/renderD128 -f x11grab -video_size 1920x1080 -i :0 -vf 'format=nv12,hwupload' -c:v h264_vaapi -profile:v 578 -bf 0 -y out.mkv ffmpeg version N-90148-g0419623cdc Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7.3.0 (GCC)
configuration: --prefix=/usr --disable-doc --enable-gpl --enable-libvpx --enable-libx265 --enable-libx264 --enable-gnutls --enable-libdrm --enable-libfreetype --enable-libmp3lame
  libavutil      56.  7.101 / 56.  7.101
  libavcodec     58. 12.102 / 58. 12.102
  libavformat    58.  9.100 / 58.  9.100
  libavdevice    58.  2.100 / 58.  2.100
  libavfilter     7. 12.100 /  7. 12.100
  libswscale      5.  0.101 /  5.  0.101
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'. Reading option '-vaapi_device' ... matched as option 'vaapi_device' (set VAAPI hardware device (DRM path or X11 display name)) with argument '/dev/dri/renderD128'. Reading option '-f' ... matched as option 'f' (force format) with argument 'x11grab'. Reading option '-video_size' ... matched as AVOption 'video_size' with argument '1920x1080'.
Reading option '-i' ... matched as input url with argument ':0'.
Reading option '-vf' ... matched as option 'vf' (set video filters) with argument 'format=nv12,hwupload'. Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'h264_vaapi'. Reading option '-profile:v' ... matched as option 'profile' (set profile) with argument '578'.
Reading option '-bf' ... matched as AVOption 'bf' with argument '0'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option 'out.mkv' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Applying option vaapi_device (set VAAPI hardware device (DRM path or X11 display name)) with argument /dev/dri/renderD128. [AVHWDeviceContext @ 0x2152640] Opened VA display via DRM device /dev/dri/renderD128.
[AVHWDeviceContext @ 0x2152640] libva: VA-API version 1.1.0
[AVHWDeviceContext @ 0x2152640] libva: va_getDriverName() returns 0
[AVHWDeviceContext @ 0x2152640] libva: User requested driver 'radeonsi'
[AVHWDeviceContext @ 0x2152640] libva: Trying to open /usr/lib/dri/radeonsi_drv_video.so [AVHWDeviceContext @ 0x2152640] libva: Found init function __vaDriverInit_1_1
[AVHWDeviceContext @ 0x2152640] libva: va_openDriver() returns 0
[AVHWDeviceContext @ 0x2152640] Initialised VAAPI connection: version 1.1
[AVHWDeviceContext @ 0x2152640] Format 0x3231564e -> nv12.
[AVHWDeviceContext @ 0x2152640] Format 0x30313050 -> p010le.
[AVHWDeviceContext @ 0x2152640] Format 0x36313050 -> unknown.
[AVHWDeviceContext @ 0x2152640] Format 0x32315659 -> yuv420p.
[AVHWDeviceContext @ 0x2152640] Format 0x56595559 -> unknown.
[AVHWDeviceContext @ 0x2152640] Format 0x59565955 -> uyvy422.
[AVHWDeviceContext @ 0x2152640] Format 0x41524742 -> bgra.
[AVHWDeviceContext @ 0x2152640] Format 0x41424752 -> rgba.
[AVHWDeviceContext @ 0x2152640] Format 0x58524742 -> bgr0.
[AVHWDeviceContext @ 0x2152640] Format 0x58424752 -> rgb0.
[AVHWDeviceContext @ 0x2152640] Unknown driver "Mesa Gallium driver 18.1.0-devel for AMD Radeon R9 200 Series (TONGA / DRM 3.25.0 / 4.16.0-rc1-g2693c7e7ca44, LLVM 7.0.0)", assuming standard behaviour.
Applying option y (overwrite output files) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url :0.
Applying option f (force format) with argument x11grab.
Successfully parsed a group of options.
Opening an input file: :0.
[x11grab @ 0x223ca00] Probe buffer size limit of 5000000 bytes reached
[x11grab @ 0x223ca00] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':0':
  Duration: N/A, start: 1519432751.575405, bitrate: N/A
Stream #0:0, 1, 1/1000000: Video: rawvideo, 1 reference frame (BGR[0] / 0x524742), bgr0, 1920x1080, 0/1, 29.97 fps, 1000k tbr, 1000k tbn, 1000k tbc
Successfully opened the file.
Parsing a group of options: output url out.mkv.
Applying option vf (set video filters) with argument format=nv12,hwupload.
Applying option c:v (codec name) with argument h264_vaapi.
Applying option profile:v (set profile) with argument 578.
Successfully parsed a group of options.
Opening an output file: out.mkv.
[file @ 0x224ab40] Setting default whitelist 'file,crypto'
Successfully opened the file.
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_vaapi))
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[rawvideo @ 0x22467c0] PACKET SIZE: 8294400, STRIDE: 7680
detected 4 logical cores
[Parsed_format_0 @ 0x224cc00] Setting 'pix_fmts' to value 'nv12'
[graph 0 input from stream 0:0 @ 0x224dbc0] Setting 'video_size' to value '1920x1080'
[graph 0 input from stream 0:0 @ 0x224dbc0] Setting 'pix_fmt' to value '123'
[graph 0 input from stream 0:0 @ 0x224dbc0] Setting 'time_base' to value '1/1000000' [graph 0 input from stream 0:0 @ 0x224dbc0] Setting 'pixel_aspect' to value '0/1' [graph 0 input from stream 0:0 @ 0x224dbc0] Setting 'sws_param' to value 'flags=2' [graph 0 input from stream 0:0 @ 0x224dbc0] Setting 'frame_rate' to value '30000/1001' [graph 0 input from stream 0:0 @ 0x224dbc0] w:1920 h:1080 pixfmt:bgr0 tb:1/1000000 fr:30000/1001 sar:0/1 sws_param:flags=2
[format @ 0x21521c0] Setting 'pix_fmts' to value 'vaapi_vld'
[auto_scaler_0 @ 0x224f000] Setting 'flags' to value 'bicubic'
[auto_scaler_0 @ 0x224f000] w:iw h:ih flags:'bicubic' interl:0
[Parsed_format_0 @ 0x224cc00] auto-inserting filter 'auto_scaler_0' between the filter 'graph 0 input from stream 0:0' and the filter 'Parsed_format_0' [AVFilterGraph @ 0x224bf80] query_formats: 5 queried, 3 merged, 1 already done, 0 delayed [auto_scaler_0 @ 0x224f000] w:1920 h:1080 fmt:bgr0 sar:0/1 -> w:1920 h:1080 fmt:nv12 sar:0/1 flags:0x4
[hwupload @ 0x224a2c0] Surface format is nv12.
[AVHWFramesContext @ 0x224a0c0] Created surface 0x1.
[AVHWFramesContext @ 0x224a0c0] Direct mapping disabled: deriving image does not work: 6 (invalid VASurfaceID).
[AVHWFramesContext @ 0x224a0c0] Map surface 0x1.
[AVHWFramesContext @ 0x224a0c0] Unmap surface 0x1.
[h264_vaapi @ 0x2248bc0] Warning: some packed headers are not supported (want 0xd, got 0).
[h264_vaapi @ 0x2248bc0] Using nv12 as format of reconstructed frames.
[AVHWFramesContext @ 0x22edf80] Created surface 0x3.
[AVHWFramesContext @ 0x22edf80] Direct mapping disabled: deriving image does not work: 6 (invalid VASurfaceID).
[AVHWFramesContext @ 0x22edf80] Created surface 0x4.
[AVHWFramesContext @ 0x22edf80] Created surface 0x5.
[h264_vaapi @ 0x2248bc0] Using fixed QP = 20 / 20 / 24 for IDR- / P- / B-frames.
[matroska @ 0x2246d80] get_metadata_duration returned: 0
Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing input
Error initializing output stream 0:0 --
[AVIOContext @ 0x2249b80] Statistics: 0 seeks, 1 writeouts
Conversion failed



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