[Solved] ffmpeg and x11grab - can't grab entire xorg/winmngr screen?

Question

Hi.
Got a Xorg running with OpenBox and I'd like to record the entire screen area,
for this I'm using the following:
ffmpeg -v 1 -f x11grab -r 30 -i :0.0 -f alsa -i hw:0,0 -acodec flac -vcodec libx264 -s 1920x1080 -crf 0 test.mkv
YouTube clip describing it better then I can in words
http://www.youtube.com/watch?v=11vA8BnYvzY
This gives me about ~400x400 resolution which has been stretched to a 1920x1080 resolution, most likely because X runs at ~400x400 while the window manager is actually running at the full resolution.
Any ideas on how to fix this?
I've been fippling around with the settings for a bit but nothing seems to be working, this is my xorg conf:
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1920x1080"
EndSubSection
EndSection
Also, xrandr shows:
[user@faparch ~]$ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
VGA-0 disconnected (normal left inverted right x axis y axis)
LVDS-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 380mm x 220mm
1920x1080 60.0*+
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)
DP-6 disconnected (normal left inverted right x axis y axis)
Last edited by Torxed (2013-01-29 19:05:56)

Answer 1

You simply needed to move "-s 1920x1080" as in input option. Otherwise, as in your first post, the default size for x11grab is 640x480 and you're resizing it to 1920x1080.
"-preset veryslow" is a libx264 option and is ignored by huffyuv.
"-qscale 1" is an output option, but you're attempting to apply it to the input which does not make sense. Also, huffyuv ignores qscale, since it is a lossless encoder, so you don't need it for an output option either.
Last edited by DrZaius (2013-01-31 20:57:50)