[FFmpeg-user] ffmpeg screencapture from a virtual xserver larger than the physical screen

[Zenny]

On 11/20/15, Zenny <garbytrash at gmail.com> wrote:
> On 11/19/15, Nicolas George <george at nsup.org> wrote:
>> Le nonidi 29 brumaire, an CCXXIV, Zenny a écrit :
>>> Did exactly as you described, but there is no mouse or keyboard
>>> interaction with the ffmpeg-piped window. Tried with -south option and
>>> brought the mouse to the bottom of the screen, no luck.
>>>
>>> If anyone has glued x2x with the ffmpeg-piped displays of the Xvbf
>>> virtual server, appreciate if you share.
>>
>> I just tried:
>>
>> Xvfb :1 -screen 0 1024x768x24
>> x2x -east -to :1
>> ffmpeg -f x11grab -i :1 -f opengl -
>
>
> Thanks, Nicholos.
>
> It worked, but compared to xpra,
> 1. the output is interaction lagged and,
> 2.  piped output only covers only 1/4th of the screen until in Slideshow
> mode.
>
> I used the following commands with some modifications I needed:
>
> $ Xvfb :99 -screen 0 3840x2160x24+32 -fbdir /var/tmp
> $ x2x -east -to :99
> $ ffmpeg -f x11grab -s 3840x2160 -i :99 -r 24 -pix_fmt yuv420p -f opengl -
> $ export DISPLAY=:99 libreoffice
>
> You might have noted that the virtual screen is at 4K (3840x2160)
> whereas the physical screen for interaction is =<FullHD (1920x1080)


Forgot to tell, I tried with:
$ ffmpeg -f x11grab -s 3840x2160 -i :99 -r 24 -s 1920x1080 -pix_fmt
yuv420p -f opengl -

But the results are same as described earlier in §1 and §2.


>
> Thanks you again for valuable inputs,
>
> Cheers,
>
> /z
>
>
>>
>> and it works. Using any other output system would not change anything. I
>> do
>> not know why it does not work for you.
>>
>> Regards,
>>
>> --
>>   Nicolas George
>>
>