Bdtyktl

I've been trying to grab the output of a second display server with FFmpeg, however when I open the video in VLC on my PC it appears to be a black screen. I've tried both with FFmpeg from apt and one I build myself but they both get the same output.

Here's the command I used for the video:

ffmpeg -y -framerate 30 -f x11grab -video_size 1024x576 -i :1 -vcodec qtrle out.mov

And here's the output from FFmpeg

ffmpeg version N-92272-g0e9c01f Copyright (c) 2000-2018 the FFmpeg developers

  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609

  configuration: --prefix=/home/nas/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/nas/ffmpeg_build/include --extra-ldflags=-L/home/nas/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/nas/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxcb --enable-nonfree

  libavutil      56. 20.100 / 56. 20.100

  libavcodec     58. 34.100 / 58. 34.100

  libavformat    58. 19.102 / 58. 19.102

  libavdevice    58.  4.106 / 58.  4.106

  libavfilter     7. 38.100 /  7. 38.100

  libswscale      5.  2.100 /  5.  2.100

  libswresample   3.  2.100 /  3.  2.100

  libpostproc    55.  2.100 / 55.  2.100

[x11grab @ 0x33a5a00] XFixes not available, cannot draw the mouse.

Input #0, x11grab, from ':1':

  Duration: N/A, start: 1540586402.265804, bitrate: N/A

    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1024x576, 30 fps, 30 tbr, 1000k tbn, 1000k tbc

Stream mapping:

  Stream #0:0 -> #0:0 (rawvideo (native) -> qtrle (native))

Press [q] to stop, [?] for help

Output #0, mov, to 'out.mov':

  Metadata:

    encoder         : Lavf58.19.102

    Stream #0:0: Video: qtrle (rle  / 0x20656C72), rgb24, 1024x576, q=2-31, 200 kb/s, 30 fps, 15360 tbn, 30 tbc

    Metadata:

      encoder         : Lavc58.34.100 qtrle

frame=  260 fps= 30 q=-0.0 Lsize=     424kB time=00:00:08.63 bitrate= 402.7kbits/s speed=1.01x

video:423kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.432202%

Exiting normally, received signal 2.

and here's the xdpyinfo for the display:

name of display:    :1

version number:    11.0

vendor string:    AT&T Laboratories Cambridge

vendor release number:    3332

maximum request size:  4194300 bytes

motion buffer size:  256

bitmap unit, bit order, padding:    32, LSBFirst, 32

image byte order:    LSBFirst

number of supported pixmap formats:    2

supported pixmap formats:

    depth 1, bits_per_pixel 1, scanline_pad 32

    depth 24, bits_per_pixel 32, scanline_pad 32

keycode range:    minimum 8, maximum 255

focus:  window 0x1800001, revert to Parent

number of extensions:    7

    BIG-REQUESTS

    MIT-SHM

    MIT-SUNDRY-NONSTANDARD

    SHAPE

    SYNC

    XC-MISC

    XTEST

default screen number:    0

number of screens:    1



screen #0:

  dimensions:    1024x576 pixels (347x195 millimeters)

  resolution:    75x75 dots per inch

  depths (1):    24

  root window id:    0x25

  depth of root window:    24 planes

  number of colormaps:    minimum 1, maximum 1

  default colormap:    0x21

  default number of colormap cells:    256

  preallocated pixels:    black 0, white 16777215

  options:    backing-store YES, save-unders YES

  largest cursor:    1024x576

  current input event mask:    0x4a0003

    KeyPressMask             KeyReleaseMask           StructureNotifyMask

    SubstructureNotifyMask   PropertyChangeMask

  number of visuals:    1

  default visual id:  0x22

  visual:

    visual id:    0x22

    class:    TrueColor

    depth:    24 planes

    available colormap entries:    256 per subfield

    red, green, blue masks:    0xff0000, 0xff00, 0xff

    significant bits in color specification:    8 bits

If any more information (or a video sample) is required please let me know and I will get them to use.

Any help would be appreciated