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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.

• Unable to transcode video using ffmpeg transcoder

  28 octobre 2014, par user1843970

  This question may be asked in different forums but still answer is not discovered yet.

  I am trying to play *.flv using Video Module and FFMPEG Converter.
  Whenever I upload any flv Video , I get the following message :-

  PHPVideoToolkit error : Execute error. It was not possible to encode "C :\xampp\htdocs\Resonance\sites\default\files\videos\original\barsandtone_3.flv" as FFmpeg returned an error. The error is with the video codec of the input file. FFmpeg reports the error to be "Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height".

  Installed Modules are :-

  Video - 7.x-2.9

  Video.js - 7.x-2.3 - Version : 4.0.3

  Video transcoder : FFmpeg / avconv : git : c2dd5a1

  JW Player

  All above are installed correctly.

  Configuration of Video Module :-

  Inside Player Tab of Video(admin/config/media/video/players), following has been configured :-

  

  A New FLV Preset has been created and added under Preset Tab of Video(admin/config/media/video/presets). Details are as Follows :-

  Preset name :- FLV Preset

  Video output extension :- FLV Flash Video

  Video codec :- H 263/H263-1996,H263+/H0-º1998/H263 Version 2(Not sure about Video Codec)

  FFmpeg video preset :- None

  Video quality :-None

  Video speed :- None

  Dimensions :- 640 X 360

  Aspect mode :- Preserve Aspect Ratio

  When I am uploading the video from content type then it extract the thumbnail as follows :-

  

  After saving the video it shows the following Mesage :-

  

  My gut feeling is that I am setting up wrong preset but I am not able to solve this problem out. Please help me as I am very close to my completion of project which would have been waste without solving the problem.

  Updated :-

  The Console message is as follows :-

  Reported errors

  PHPVideoToolkit error : Execute error. It was not possible to encode "C :\xampp\htdocs\Resonance\sites\default\files\videos\original\barsandtone_19.flv" as FFmpeg returned an error. Note, however the error was encountered on the second pass of the encoding process and the first pass appear to go fine. The error is with the video codec of the input file. FFmpeg reports the error to be "Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height".

  Executed commands and output

  /ffmpeg/ffmpeg.exe -i "C:\xampp\htdocs\Resonance\sites\default\files\videos\original\barsandtone_7.flv" -strict experimental -vcodec "h264" -s "320x180" -acodec "aac" -ac "2" -pass "1" -passlogfile "C:\xampp\tmp/1384191046-5281144682cfc-multipass"  -y C:\xampp\tmp/1384191046-5281144681e51.flv
  
  
  
  ffmpeg version N-49610-gc2dd5a1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Feb  5 2013 13:26:02 with gcc 4.7.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 17.101 / 52. 17.101
  
    libavcodec     54. 91.100 / 54. 91.100
  
    libavformat    54. 61.104 / 54. 61.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 35.101 /  3. 35.101
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  [flv @ 00000000002fb860] max_analyze_duration 5000000 reached at 5018000 microseconds
  
  Input #0, flv, from 'C:\xampp\htdocs\Resonance\sites\default\files\videos\original\barsandtone_7.flv':
  
    Metadata:
  
      audiodelay      : 0
  
      canSeekToEnd    : true
  
    Duration: 00:00:06.00, start: 0.000000, bitrate: 118 kb/s
  
      Stream #0:0: Video: vp6f, yuv420p, 360x288, 409 kb/s, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16p, 96 kb/s
  
  [libx264 @ 0000000002457340] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  [libx264 @ 0000000002457340] profile Main, level 4.0
  
  [libx264 @ 0000000002457340] 264 - core 129 r2245 bc13772 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x1:0 me=dia subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, flv, to 'C:\xampp\tmp/1384191046-5281144681e51.flv':
  
    Metadata:
  
      audiodelay      : 0
  
      canSeekToEnd    : true
  
      encoder         : Lavf54.61.104
  
      Stream #0:0: Video: h264 ([7][0][0][0] / 0x0007), yuv420p, 320x180, q=-1--1, pass 1, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: aac ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (vp6f -> libx264)
  
    Stream #0:1 -> #0:1 (mp3 -> aac)
  
  Press [q] to stop, [?] for help
  
  frame=    2 fps=0.0 q=-1.0 Lsize=     102kB time=00:00:06.10 bitrate= 136.7kbits/s
  
  video:2kB audio:95kB subtitle:0 global headers:0kB muxing overhead 4.978013%
  
  [libx264 @ 0000000002457340] frame I:1     Avg QP:11.95  size:  1595
  
  [libx264 @ 0000000002457340] frame P:1     Avg QP: 2.00  size:    21
  
  [libx264 @ 0000000002457340] mb I  I16..4: 86.3%  0.0% 13.8%
  
  [libx264 @ 0000000002457340] mb P  I16..4:  0.4%  0.0%  0.0%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip:99.6%
  
  [libx264 @ 0000000002457340] coded y,uvDC,uvAC intra: 13.8% 40.7% 32.8% inter: 0.0% 0.0% 0.0%
  
  [libx264 @ 0000000002457340] i16 v,h,dc,p: 80% 15%  4%  0%
  
  [libx264 @ 0000000002457340] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 42% 21%  0%  0%  0%  0%  0%  0%
  
  [libx264 @ 0000000002457340] i8c dc,h,v,p: 45% 24% 31%  0%
  
  [libx264 @ 0000000002457340] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0000000002457340] kb/s:1.08
  
  
  
  /ffmpeg/ffmpeg.exe -i "C:\xampp\htdocs\Resonance\sites\default\files\videos\original\barsandtone_7.flv" -strict experimental -vcodec "h264" -s "320x180" -acodec "aac" -ac "2" -pass "2" -passlogfile "C:\xampp\tmp/1384191046-5281144682cfc-multipass"  -y C:\xampp\tmp/1384191046-5281144681e51.flv
  
  
  
  ffmpeg version N-49610-gc2dd5a1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Feb  5 2013 13:26:02 with gcc 4.7.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 17.101 / 52. 17.101
  
    libavcodec     54. 91.100 / 54. 91.100
  
    libavformat    54. 61.104 / 54. 61.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 35.101 /  3. 35.101
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  [flv @ 00000000002fb860] max_analyze_duration 5000000 reached at 5018000 microseconds
  
  Input #0, flv, from 'C:\xampp\htdocs\Resonance\sites\default\files\videos\original\barsandtone_7.flv':
  
    Metadata:
  
      audiodelay      : 0
  
      canSeekToEnd    : true
  
    Duration: 00:00:06.00, start: 0.000000, bitrate: 118 kb/s
  
      Stream #0:0: Video: vp6f, yuv420p, 360x288, 409 kb/s, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16p, 96 kb/s
  
  [libx264 @ 00000000024e7340] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  [libx264 @ 00000000024e7340] constant rate-factor is incompatible with 2pass.
  
  Output #0, flv, to 'C:\xampp\tmp/1384191046-5281144681e51.flv':
  
    Metadata:
  
      audiodelay      : 0
  
      canSeekToEnd    : true
  
      Stream #0:0: Video: h264, yuv420p, 320x180, q=-1--1, pass 2, 90k tbn, 1k tbc
  
      Stream #0:1: Audio: none, 44100 Hz, stereo, fltp, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (vp6f -> libx264)
  
    Stream #0:1 -> #0:1 (mp3 -> aac)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  I am not Unix Wizard to get the things out of this. Please help me in suggesting the right path.