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• List of Capture devices libav FFmpeg

  28 juin 2016, par esprittn

  Could anyone please, tell me how can I obtain a list of devices using libav like when I execute this ffmpeg command line

  ffmpeg -list_devices true -f dshow -i dummy

  Thanks for you great job and for your help

• Memcached protocol support

  15 novembre 2013, par Mikko Koppanen — Imagick

  For the past few days I’ve been adding Memcached binary protocol support to PECL memcached extension. The protocol handler provides a high-level abstraction for acting as a memcached server. There are quite a few things still missing and only binary protocol is supported at the moment, but the code seems to work reasonably well in small-scale testing.

  I am not sure whether this is useful for anyone, but at least it allows things such as quick prototyping of network servers, exposing sqlite database over memcached protocol etc.

  The code is quite simple and implementing a simple server responding to get and set would look roughly like the following :

  php

  < view plain text >

  1. < ?php
  2. // Create new server instance
  3. $server = new MemcachedServer() ;
  4.  
  5. // Create a simple storage class
  6. class Storage {
  7.   private $values = array () ;
  8.   
  9.   public function set ($key, $value, $expiration) {
  10.     $this->values [$key] = array (’value’ => $value,
  11.                    ’expires’ => time () + $expiration) ;
  12.   }
  13.  
  14.   public function get ($key) {
  15.     if (isset ($this->values [$key])) {
  16.       if ($this->values [$key] [’expires’] < time ()) {
  17.         unset ($this->values [$key]) ;
  18.         return null ;
  19.       }
  20.       return $this->values [$key] [’value’] ;
  21.     }
  22.     else
  23.       return null ;
  24.   }
  25. }
  26.  
  27. $storage = new Storage () ;
  28.  
  29. // Set callback for get command
  30. $server->on (Memcached: :ON_GET,
  31.        function ($client_id, $key, &$value, &$flags, &$cas) use ($storage) {
  32.          echo "Getting key=[$key]" . PHP_EOL ;
  33.          if (($value = $storage->get ($key))  != null)
  34.            return Memcached: :RESPONSE_SUCCESS ;
  35.  
  36.          return Memcached: :RESPONSE_KEY_ENOENT ;
  37.        }) ;
  38.  
  39. // Set callback for set command
  40. $server->on (Memcached: :ON_SET,
  41.        function ($client_id, $key, $value, $flags, $expiration, $cas, &$result_cas) use ($storage) {
  42.          echo "Setting key=[$key] value=[$value]" . PHP_EOL ;
  43.          $storage->set ($key, $value, $expiration) ;
  44.          return Memcached: :RESPONSE_SUCCESS ;
  45.        }) ;
  46.  
  47. // Run the server on localhost, port 3434. Will block
  48. $server->run ("127.0.0.1:3434") ;
  49.  ?>

  And the client that communicates with the server :

  php

  < view plain text >

  1. < ?php
  2.  
  3. $cache = new Memcached() ;
  4. $cache->setOption(Memcached: :OPT_BINARY_PROTOCOL, true) ;
  5. $cache->setOption(Memcached: :OPT_COMPRESSION, false) ;
  6. $cache->addServer(’localhost’, 3434) ;
  7.  
  8. $cache->set (’set_key1’, ’This is the first key’, 10) ;
  9. var_dump ($cache->get (’set_key1’)) ;
  10.  
  11. $cache->set (’set_key2’, ’This is the second key’, 2) ;
  12. var_dump ($cache->get (’set_key2’)) ;
  13.  ?>

  The code is still work in progress but it’s available in github : https://github.com/mkoppanen/php-memcached/tree/feature-server. Note that you need to compile libmemcached with –enable-libmemcachedprotocol and the PECL memcached extension with –enable-memcached-protocol.

• Kdialog unable to cancel job with ffmpeg from progressbar , with other command it works :S

  2 janvier 2015, par user1088530

  i did a script to convert my stuff with ffmpeg

  it does :

  1 create progressbar with cancel button
  2 loop to convert files
  3 set the progress value

  it works fine but it doens’t stop ffmpeg when i click on cancel

  the strange thing is that when i use another program like echo it works like it should it seems a ffmpeg issue

  can onyone help me how to find out the trick ?

  listoffile="$HOME/ffmpeglist.lst"
  
  numberoffile=$(wc -l <$listoffile)
  
  ffmpegpath="/usr/bin/ffmpeg"
  
  
  
      mystufvariabletouseonmyscript=$(kdialog --progressbar "hello this is a progress bar with 100 steps" 100) ;  sleep 2 ; qdbus $mystufvariabletouseonmyscript  showCancelButton true
  
  
  
  
  
  
  
  
  
      until test "true" = `qdbus  $mystufvariabletouseonmyscript wasCancelled` ; do 
  
  
  
              while read line ; do
  
                  qdbus $mystufvariabletouseonmyscript org.kde.kdialog.ProgressDialog.setLabelText $"Starting Conversion...processing file $line"
  
  
  
  
  
                  $ffmpegpath -i   "$line"   "${line%%.*}.$mp3" 
  
  
  
  
  
                  value=$(( $(($a*100))/$numberoffile ))
  
                  qdbus  $mystufvariabletouseonmyscript Set org.kde.kdialog.ProgressDialog value $value
  
                  a=$(($a+1))
  
  
  
                  done< "$listoffile"
  
  
  
          done