Andy Furniss wrote:
Andy Furniss wrote:
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.

Bisected to -

commit ae7df68edd79bce5c318810c6b307ee4e81cd2a6
Author: James Almer <jamr...@gmail.com>
Date:   Fri Nov 24 19:42:50 2017 -0300

avformat/avc: return an error in ff_isom_write_avcc if the buffer lenght is too small

     Signed-off-by: James Almer <jamr...@gmail.com>

I thought this was just screen rec initially, but it can be reproduced
with a transcode as well. Replacing mkv with mp4 in the examples will work OK.

Adding Mark to cc.

ffm -vaapi_device /dev/dri/renderD128 -i ~/abc-60fps.mp4 -an -sn -vf 'format=nv12,hwupload' -c:v h264_vaapi -profile:v 578 -bf 0 -y ~/out.mkv ffmpeg version N-90242-g5ab0ecf283 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.  8.100 / 56.  8.100
  libavcodec     58. 13.102 / 58. 13.102
  libavformat    58. 10.100 / 58. 10.100
  libavdevice    58.  2.100 / 58.  2.100
  libavfilter     7. 12.100 /  7. 12.100
  libswscale      5.  0.102 /  5.  0.102
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/andy/abc-60fps.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.0.100
  Duration: 00:01:36.00, start: 0.000000, bitrate: 624 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 619 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
    Metadata:
      handler_name    : VideoHandler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_vaapi))
Press [q] to stop, [?] for help
[h264_vaapi @ 0x4062880] Warning: some packed headers are not supported (want 0xd, got 0). Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing input
Error initializing output stream 0:0 --
Conversion failed!
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