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• Stream video and commands on same connection or split connections ?

  10 mai 2013, par bizzehdee

  Background

  I am in the middle of writing a client/server app that i will install on every machine within my office (roughly 30 - 35 machines). I currently have the client connecting to the server and it has an ability to send mouse movement, mouse clicks, key strokes and execute certain commands. The next step is to stream back a video output of the screen, i am using the GDI method from Fastest method of screen capturing to capture the entire screen and will be using the x264 encoder to compress the frames and transmit them back to the client which will then decode and display the stream.

  Question

  is it best (by means of reducing lag, ensuring all commands are delivered as fast as possible and that streaming is as live as possible) that i transmit back along the same connection that i established for the commands, or, should i establish a separate connection on the same port, or on a different port to stream back the video ?

  P.S.

  i am aware that VNC, RD and other things such as TeamViewer already exist and already do this sort of thing, but none of these support all the requirements needed for what we need within this system.

• x11grab : Check the XQueryPointer return value

  26 septembre 2014, par Antonio Ospite

  x11grab : Check the XQueryPointer return value
  The paint_mouse_pointer() code uses XFixes to retrieve the cursor
  
  coordinates, but XFixes gives no information about which screen the
  
  pointer is on ; this results in always drawing the cursor on the
  
  captured screen even if the mouse pointer was on another screen.
  For example, when capturing from screen 1 (i.e. -f x11grab -i ":0.1")
  
  the cursor was being drawn in the captured image even when the mouse
  
  pointer was actually on screen 0, which is wrong and visually confusing.
  CC : libav-stable@libav.org
  
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DBH] libavdevice/x11grab.c

• Revision 1fbab853c8 : AVX2 To VP9 Block Error Optimization vp9_block_error_sse2 can only handle 16 by

  23 avril 2014, par levytamar82

  Changed Paths :
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Add /vp9/encoder/x86/vp9_error_intrin_avx2.c

  
   Modify /vp9/vp9cx.mk

  
  
  AVX2 To VP9 Block Error Optimization

  vp9_block_error_sse2 can only handle 16 bytes at a time but
  the function requires to handle a sequence of 32 bytes at a time
  so each 16 bytes is handled in a different register.
  With AVX2 optimization the 32 bytes can be handled in one register instead
  of two in the SSE2
  The vp9_block_error was optimized by 85%.
  The user level was optimized by 1.2%

  Change-Id : Ia8fffe60e61eff7432a5fbd538757894f6c319fd