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• tcp : set socket buffer sizes before listen/connect/accept

  9 janvier 2017, par Joel Cunningham

  tcp : set socket buffer sizes before listen/connect/accept
  From e24d95c0e06a878d401ee34fd6742fcaddeeb95f Mon Sep 17 00:00:00 2001
  
  From : Joel Cunningham <joel.cunningham@me.com>
  
  Date : Mon, 9 Jan 2017 13:37:51 -0600
  
  Subject : [PATCH] tcp : set socket buffer sizes before listen/connect/accept
  Attempting to set SO_RCVBUF and SO_SNDBUF on TCP sockets after connection
  
  establishment is incorrect and some stacks ignore the set call on the socket at
  
  this point.  This has been observed on MacOS/iOS.  Windows 7 has some peculiar
  
  behavior where setting SO_RCVBUF after applies only if the buffer is increasing
  
  from the default while decreases are ignored.  This is possibly how the incorrect
  
  usage has gone unnoticed
  Unix Network Programming Vol. 1 : The Sockets Networking API (3rd edition, seciton 7.5) :
  "When setting the size of the TCP socket receive buffer, the ordering of the
  
  function calls is important.  This is because of TCP’s window scale option,
  
  which is exchanged with the peer on SYN segments when the connection is
  
  established. For a client, this means the SO_RCVBUF socket option must be
  
  set before calling connect.  For a server, this means the socket option must
  
  be set for the listening socket before calling listen.  Setting this option
  
  for the connected socket will have no effect whatsoever on the possible window
  
  scale option because accept does not return with the connected socket until
  
  TCP’s three-way handshake is complete.  This is why the option must be set on
  
  the listening socket. (The sizes of the socket buffers are always inherited from
  
  the listening socket by the newly created connected socket)"
  Signed-off-by : Joel Cunningham <joel.cunningham@me.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/tcp.c

• How to display animated svg over video using ffmpeg ?

  27 mars 2023, par Shivam gupta

  I am trying to show animated svg above the video.
I am able to show svg over video but it is static means animation is not visible.

  


  I am able to achieve this by enabling enable-librsvg flag in ffmpeg and used below command to generate output

  


  ./ffmpeg -i ~/Downloads/video2.mp4 -i ~/Downloads/plant-2.svg -filter_complex "[0:v][1:v] overlay=0:0" -c:a copy output.mp4


  


  I am not sure what i am doing wrong due to which instead of animated svg static svg is coming.

  


• Revision 46aed7b8d0 : Set the skip flag to 1 for skippable blocks If the partition block is skippable

  16 septembre 2014, par Yunqing Wang

  Changed Paths :
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Set the skip flag to 1 for skippable blocks

  If the partition block is skippable, which means no coefficients
  for Y, U, and V planes, its skip flag is set to 1. No quality
  change (verified by borg tests), and no noticeable speed change.

  Change-Id : I9231f720f8dd6364384cf05aa148ca24d75450f1