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• network : Add RFC 8305 style "Happy Eyeballs"/"Fast Fallback" helper function

  10 août 2018, par Martin Storsjö

  network : Add RFC 8305 style "Happy Eyeballs"/"Fast Fallback" helper function
  For cases with dual stack (IPv4 + IPv6) connectivity, but where one
  
  stack potentially is less reliable, strive to trying to connect over
  
  both protocols in parallel, using whichever address connected first.
  In cases with a hostname resolving to multiple IPv4 and IPv6
  
  addresses, the current connection mechanism would try all addresses
  
  in the order returned by getaddrinfo (with all IPv6 addresses ordered
  
  before the IPv4 addresses normally). If connection attempts to the
  
  IPv6 addresses return quickly with an error, this was no problem, but
  
  if they were unsuccessful leading up to timeouts, the connection process
  
  would have to wait for timeouts on all IPv6 target addresses before
  
  attempting any IPv4 address.
  Similar to what RFC 8305 suggests, reorder the list of addresses to
  
  try connecting to, interleaving address families. After starting one
  
  connection attempt, start another one in parallel after a small delay
  
  (200 ms as suggested by the RFC).
  For cases with unreliable IPv6 but reliable IPv4, this should make
  
  connection attempts work as reliably as with plain IPv4, with only an
  
  extra 200 ms of connection delay.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/network.c
  • [DBH] libavformat/network.h

• Converting video to a full sized image using all frames

  13 décembre 2014, par sroot

  I was wondering if there is any way to convert a video to an image ?
  Something like a scanner algorithm , something that would basically take all frames and convert it into one big image ?
  I know i can break the video into frames and then stitch them together , I was wondering if there is any faster and more simple solution to achieve the same .
  If it can’t be done can someone think how can I take the video in a "scanner" like mechanism ?

• How to rotate thumbnail image in ffmpeg

  27 mai 2014, par Vishal Sharma

  I am using this code for my thumbnail image

  <?php 
  
  $ffmpeg = '/usr/bin/ffmpeg'; 
  
  $second = 2;
  
  $video = 'video/123.mp4';    
  
  $image = 'thumb/123.jpg';
  
  $command = "$ffmpeg  -itsoffset -$second  -i $video -vcodec mjpeg -vframes 1 -an -f rawvideo -s 175x150 $image"; 

  its giving me the thumbnail image BUT i want to rotate that thumbnail image. I already tried transpose and rotate but nothing happen even i lost the thumbnail image also.

  Tried solutions but nothing happen :-

  $command ="$ffmpeg -itsoffset -$second -i $video -vcodec mjpeg -vframes 1 -vf 'transpose=1' -an -f rawvideo -s 175x150 $image"; 

  and

  $command ="$ffmpeg -itsoffset -$second -i $video -vcodec mjpeg -vframes 1 -vf 'rotate=PI/2' -an -f rawvideo -s 175x150 $image";

  Please help me.....