Re: live copy of an X screen
|[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]|
On 01/27/2012 11:45 PM, Matthew Monaco wrote:
On 01/27/2012 11:13 AM, Arnaud Loonstra wrote:Hi all, I've been searching for a while for this but don't seem to find a solution. My quest is: Is it possible to get a copy of an X screen so I can display it somewhere else? Suppose I have two X screens :0.0 and :0.1. Would it be possible to capture :0.1 and display it in a little window on :0.0? This would be extremely useful for running things fullscreen on a second display (:0.1) while controlling it from the first (:0.0) while being able to see the contents of the second on the first display. I could write some capture code and get a framebuffer this way but I thought I would first explore if this isn't somehow built in already or done before? Any thoughts/suggestions? Rg, Arnaud LoonstraI use x11vnc / tightvnc
I know it's an option however the overhead is way too high. The perfect solution would be to do it in the gpu. Everything is there so why process it in the cpu. In openGL you can do similar things with render to texture code.
I'm not familiar with any X11 api but there seem to be calls to just grab a display. I've been browsing through the ffmpeg code
http://git.videolan.org/?p=ffmpeg.git;a=blob;f=libavdevice/x11grab.c;h=722f00ff0df14848e9c4202fd63360f60a7ee1ee;hb=HEAD Which is giving some pointers... the Display struct, Xshm? I've tried how much overhead such code would take by issuing ffmpeg -f x11grab -r 10 -s xga -i :0.0 -an -f rawvideo /dev/nullwhich takes some 10% of CPU. This is still too much... In this case ffmpeg is still passing the data through. No encoding..
Input #0, x11grab, from ':0.0': Duration: N/A, start: 1327750724.645929, bitrate: 251658 kb/sStream #0.0: Video: rawvideo, rgb32, 1024x768, 251658 kb/s, 10 tbr, 1000k tbn, 10 tbc
File '/dev/null' already exists. Overwrite ? [y/N] y Output #0, rawvideo, to '/dev/null':Stream #0.0: Video: rawvideo, rgb32, 1024x768, q=2-31, 200 kb/s, 90k tbn, 10 tbc
Stream mapping: Stream #0.0 -> #0.0 Rg, Arnaud Loonstra -- Stichting z25.org Concordiastraat 67A 3551 EM Utrecht The Netherlands +31-(0)6-41861063 _______________________________________________ xorg@xxxxxxxxxxx: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: list-xorg@xxxxxxxxxxx
[X Forum] [Nouveau Driver] [Devices] [XFree86] [XFree86 Newbie] [Site Home] [IETF Annouce] [Security] [Fontconfig] [Bugtraq] [Photo] [Yosemite] [MIPS Linux] [ARM Linux] [Linux Security] [Video for Linux] [Linux RAID] [Linux Resources]