[FFmpeg-user] ffmpeg screencapture from a virtual xserver larger than the physical screen
garbytrash at gmail.com
Thu Nov 19 11:36:12 CET 2015
Thanks Nicolas for the pointer.
I am trying to use xvfb with xpra for forwarding. However there I am
experiencing a bottleneck. The capture is 4k, but the content ran via
xpra is only 1/4th of the screen. Xpra client is at FullHD.
Discussed over the xpra bugtracker at
http://xpra.org/trac/ticket/1036#comment:11, something is going wrong,
but cannot say where?!
To screencapture the virtual x instance, I used:
$ ffmpeg -f x11grab -s 3840x2160 -i :99 -r 24 -deadline realtime -b:v
1M -threads 5 -qmin 0 -qmax 50 -crf 5 -preset ultrafast -f matroska
The capture looks like: http://picpaste.com/IgV8eLMl.jpg
Any inputs appreciated.
On 11/12/15, Nicolas George <george at nsup.org> wrote:
> Le duodi 22 brumaire, an CCXXIV, Zenny a écrit :
>> 1. create a virtual xserver of 4k resolution without any physical
>> display, and pipe to the physical screen (downsizing to FullHD ).
> Nicolas George
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