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• How to create a command – Introducing the Piwik Platform

  2 octobre 2014, par Thomas Steur — Development

  This is the next post of our blog series where we introduce the capabilities of the Piwik platform (our previous post was How to publish your plugin or theme on the Piwik Marketplace). This time you’ll learn how to create a new command. For this tutorial you will need to have basic knowledge of PHP.

  What is a command ?

  A command can execute any task on the command line. Piwik provides currently about 50 commands via the Piwik Console. These commands let you start the archiver, change the number of available custom variables, enable the developer mode, clear caches, run tests and more. You could write your own command to sync users or websites with another system for instance.

  Getting started

  In this series of posts, we assume that you have already set up your development environment. If not, visit the Piwik Developer Zone where you’ll find the tutorial Setting up Piwik.

  To summarize the things you have to do to get setup :

  • Install Piwik (for instance via git).
  • Activate the developer mode : ./console development:enable --full.
  • Generate a plugin : ./console generate:plugin --name="MyCommandPlugin". There should now be a folder plugins/MyCommandPlugin.
  • And activate the created plugin under Settings => Plugins.

  Let’s start creating a command

  We start by using the Piwik Console to create a new command. As you can see there is even a command that lets you easily create a new command :

  ./console generate:command

  The command will ask you to enter the name of the plugin the created command should belong to. I will simply use the above chosen plugin name “MyCommandPlugin”. It will ask you for a command name as well. I will use “SyncUsers” in this example. There should now be a file plugins/MyCommandPlugin/Commands/Syncusers.php which contains already an example to get you started easily :

  class Syncusers extends ConsoleCommand
  {
      protected function configure()
      {
          $this->setName('mycommandplugin:syncusers');
          $this->setDescription('MyCommandPlugin');
          $this->addOption('name', null, InputOption::VALUE_REQUIRED, 'Your name:');
      }
   
      /**
       * Execute command like: ./console mycommandplugin:syncusers --name="The Piwik Team"
       */
      protected function execute(InputInterface $input, OutputInterface $output)
      {
          $name    = $input->getOption('name');
   
          $message = sprintf('Syncusers: %s', $name);
   
          $output->writeln($message);
      }
  }
  Télécharger

  Any command that is placed in the “Commands” folder of your plugin will be available on the command line automatically. Therefore, the newly created command can now be executed via ./console mycommandplugin:syncusers --name="The Piwik Team".

  The code template explained

  protected function configure()
  {
      $this->setName('mycommandplugin:checkdatabase');
      $this->setDescription('MyCommandPlugin');
      $this->addOption('name', null, InputOption::VALUE_REQUIRED, 'Your name:');
  }
  Télécharger

  As the name says the method configure lets you configure your command. You can define the name and description of your command as well as all the options and arguments you expect when executing it.

  protected function execute(InputInterface $input, OutputInterface $output)
  {
      $name    = $input->getOption('name');
      $message = sprintf('Syncusers: %s', $name);
      $output->writeln($message);
  }
  Télécharger

  The actual task is defined in the execute method. There you can access any option or argument that was defined on the command line via $input and write anything to the console via $output argument.

  In case anything went wrong during the execution you should throw an exception to make sure the user will get a useful error message. Throwing an exception when an error occurs will make sure the command does exit with a status code different than 0 which can sometimes be important.

  Advanced features

  The Piwik Console is based on the powerful Symfony Console component. For instance you can ask a user for any interactive input, you can use different output color schemes and much more. If you are interested in learning more all those features have a look at the Symfony console website.

  How to test a command

  After you have created a command you are surely wondering how to test it. Ideally, the actual command is quite short as it acts like a controller. It should only receive the input values, execute the task by calling a method of another class and output any useful information. This allows you to easily create a unit or integration test for the classes behind the command. We will cover this topic in one of our future blog posts. Just one hint : You can use another command ./console generate:test to create a test. If you want to know how to test a command have a look at the Testing Commands documentation.

  Publishing your Plugin on the Marketplace

  In case you want to share your commands with other Piwik users you can do this by pushing your plugin to a public GitHub repository and creating a tag. Easy as that. Read more about how to distribute a plugin and best practices when publishing a plugin.

  Isn’t it easy to create a command ? We never even created a file ! If you have any feedback regarding our APIs or our guides in the Developer Zone feel free to send it to us.

• Probe function in ffmpeg

  14 octobre 2014, par eejs

  I am trying to write a demuxer for STL subtitle format(FFmpeg). I am having trouble understanding how the probe function is referenced in ffmpeg.
  I have the following code for my probe :

  #include "avformat.h"
  
  #include "internal.h"
  
  #include "subtitles.h"
  
  #include "libavutil/intreadwrite.h"
  
  
  
  typedef struct {
  
      FFDemuxSubtitlesQueue q;
  
  } STLContext;
  
  
  
  static int stl_probe(AVProbeData *p)
  
  {
  
      char c;
  
      const unsigned char *ptr = p->buf;
  
      av_log(0,100,"printing the probe function");
  
      while(*ptr=='\r' || *ptr=='\n' || *ptr=='$' || (ptr[0]=='/' && ptr[1]=='/'))
  
          ptr+=ff_subtitles_next_line(ptr);
  
      if (sscanf(ptr, "%*d:%*d:%*d:%*d , %*d:%*d:%*d:%*d , %c", &c) == 1)
  
          return AVPROBE_SCORE_MAX;
  
       return 0;
  
  
  
  }
  
  static int64_t get_pts(char **buf, int *duration)
  
  {
  
          int hh1, mm1, ss1, ms1;
  
          int hh2, mm2, ss2, ms2;
  
          int len=0;
  
          if (sscanf(*buf, "%2d:%2d:%2d:%2d , %2d:%2d:%2d:%2d , %n",
  
                     &hh1, &mm1, &ss1, &ms1,
  
                     &hh2, &mm2, &ss2, &ms2, &len) >= 8 && len>0) {
  
              int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
  
              int64_t end   = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
  
              *duration = end - start;
  
              *buf+=len;
  
              return start;
  
           }
  
          return AV_NOPTS_VALUE;
  
  }
  
  
  
  static int stl_read_header(AVFormatContext *s)
  
  {
  
      STLContext *stl = s->priv_data;
  
      AVStream *st = avformat_new_stream(s, NULL);
  
  
  
      if (!st)
  
          return AVERROR(ENOMEM);
  
      avpriv_set_pts_info(st, 64, 1, 100);
  
      st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
  
      st->codec->codec_id   = AV_CODEC_ID_TEXT;
  
  
  
      while (!avio_feof(s->pb)) {
  
          char line[4096];
  
          char *p = line;
  
          const int64_t pos = avio_tell(s->pb);
  
          int len = ff_get_line(s->pb, line, sizeof(line));
  
          int64_t pts_start;
  
          int duration;
  
          if (!len)
  
              break;
  
  
  
          line[strcspn(line, "\r\n")] = 0;
  
  
  
          pts_start = get_pts(&p , &duration);
  
          if (pts_start != AV_NOPTS_VALUE) {
  
              AVPacket *sub;
  
  
  
              sub = ff_subtitles_queue_insert(&stl->q, p, strlen(p), 0);
  
              if (!sub)
  
                  return AVERROR(ENOMEM);
  
              sub->pos = pos;
  
              sub->pts = pts_start;
  
              sub->duration = duration;
  
          }
  
      }
  
  
  
      ff_subtitles_queue_finalize(&stl->q);
  
      return 0;
  
  
  
  }
  
  static int stl_read_packet(AVFormatContext *s, AVPacket *pkt)
  
  {
  
      STLContext *stl = s->priv_data;
  
      return ff_subtitles_queue_read_packet(&stl->q, pkt);
  
  }
  
  
  
  static int stl_read_seek(AVFormatContext *s, int stream_index,
  
                               int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
  
  {
  
      STLContext *stl = s->priv_data;
  
      return ff_subtitles_queue_seek(&stl->q, s, stream_index,
  
                                     min_ts, ts, max_ts, flags);
  
  }
  
  
  
  static int stl_read_close(AVFormatContext *s)
  
  {
  
      STLContext *stl = s->priv_data;
  
      ff_subtitles_queue_clean(&stl->q);
  
      return 0;
  
  }
  
  
  
  AVInputFormat ff_stl_demuxer = {
  
      .name           = "stl",
  
      .long_name      = NULL_IF_CONFIG_SMALL("STL subtitles"),
  
      .priv_data_size = sizeof(STLContext),
  
      .read_probe     = stl_probe,
  
      .read_header    = stl_read_header,
  
      .read_packet    = stl_read_packet,
  
      .read_seek2     = stl_read_seek,
  
      .read_close     = stl_read_close,
  
      .extensions     = "stl",
  
  };

  Output of ./ffmpeg -f stl -i Test.stl Test.srt

  ffmpeg version N-66838-g9071bab Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Oct 14 2014 12:28:54 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: 
  
    libavutil      54. 10.100 / 54. 10.100
  
    libavcodec     56.  4.101 / 56.  4.101
  
    libavformat    56.  9.100 / 56.  9.100
  
    libavdevice    56.  1.100 / 56.  1.100
  
    libavfilter     5.  1.105 /  5.  1.105
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
  Input #0, stl, from '/home/eejya/SubtitleTesting/UK_FINAL_240511.stl':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Subtitle: text
  
  Output #0, srt, to '/home/eejya/SubtitleTesting/UkTest.srt':
  
    Metadata:
  
      encoder         : Lavf56.9.100
  
      Stream #0:0: Subtitle: subrip (srt)
  
      Metadata:
  
        encoder         : Lavc56.4.101 srt
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (text (native) -> subrip (srt))
  
  Press [q] to stop, [?] for help
  
  size=      10kB time=00:27:10.06 bitrate=   0.0kbits/s    
  
  video:0kB audio:0kB subtitle:4kB other streams:0kB global headers:0kB muxing overhead: 121.594238%

  when I run the command

  ./ffmpeg -i Test.stl Test.srt 

  I don’t see any output printed by av_log and it says that the probe score is very less which may lead to mis-detection. That would mean only the extension is being checked.So, either my probe function is not being called or the buffer isn’t being read.
  How do I check whether my probe function is being called or not ?
  Also does the low score warning imply that the function is being called ?

• ffmpeg error : parsed_overlay framesync - Buffer queue overflow, dropping

  23 octobre 2014, par Tom

  On most video files my ffmpeg command works fine. but on some video files I get the following error code. something goes wrong with scaling and overlaying filters. but it depends on input files. I’m still searching for reasons and solutions. Maybe somebody knows more about it ?

      [Parsed_overlay_1 @ *] [framesync @ *] Buffer queue overflow, dropping." 

  Input :

    ffmpeg 
  
    -i "/var/www/vhosts/domain.com/httpdocs/video/temp/input.wmv" 
  
    -i "/var/www/vhosts/domain.com/httpdocs/images/logo_w140.png" 
  
    -filter_complex 'scale=trunc(oh*a/2)*2:320,overlay=main_w-overlay_w-10:main_h-overlay_h-10' 
  
    -ss 00:00:00 -t 00:00:44 -r 24 -b:v 360k -bt 416k -vcodec libx264 
  
    -preset veryslow -ar 11025 -y -acodec libfaac -ac 1 -ab 64k 
  
    /var/www/vhosts/domain.com/httpdocs/Protected/41000/output.mp4

  Output :

    ffmpeg version 2.3.2 Copyright (c) 2000-2014 the FFmpeg developers
  
      built on Aug 13 2014 16:39:32 with gcc 4.4.5 (Debian 4.4.5-8)
  
      configuration: --enable-avfilter --enable-libmp3lame --enable-shared --disable-mmx --arch=x86_64 --enable-libfaac --enable-nonfree --enable-filter=movie --enable-libx264 --enable-gpl --enable-version3 --enable-postproc --enable-libvorbis --enable-libx264 --enable-x11grab --prefix=/usr --enable-libgsm --enable-libdc1394
  
      libavutil      52. 92.100 / 52. 92.100
  
      libavcodec     55. 69.100 / 55. 69.100
  
      libavformat    55. 48.100 / 55. 48.100
  
      libavdevice    55. 13.102 / 55. 13.102
  
      libavfilter     4. 11.100 /  4. 11.100
  
      libswscale      2.  6.100 /  2.  6.100
  
      libswresample   0. 19.100 /  0. 19.100
  
      libpostproc    52.  3.100 / 52.  3.100
  
    [wmv3 @ 0x2451bb0] Extra data: 8 bits left, value: 0
  
    [mjpeg @ 0x2450c70] ignoring invalid SAR: 0/0
  
    Guessed Channel Layout for  Input Stream #0.1 : stereo
  
    Input #0, asf, from '/var/www/vhosts/domain.com/httpdocs/video/temp/input.wmv':
  
      Metadata:
  
        WMFSDKNeeded    : 0.0.0.0000
  
        DeviceConformanceTemplate: MP@LL
  
        WMFSDKVersion   : 12.0.7601.17514
  
        IsVBR           : 0
  
      Duration: 00:00:43.99, start: 0.000000, bitrate: 1584 kb/s
  
        Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg), 320x240, 90k tbr, 90k tbn, 90k tbc
  
        Metadata:
  
          comment         : Movie/video screen capture
  
        Stream #0:1(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, 2 channels, fltp, 96 kb/s
  
        Stream #0:2(eng): Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 320x240, 1500 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
  
    Input #1, image2, from '/var/www/vhosts/domain.com/httpdocs/images/logo_w140.png':
  
      Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
        Stream #1:0: Video: png, rgba, 140x36, 25 tbr, 25 tbn, 25 tbc
  
    [swscaler @ 0x2432d50] deprecated pixel format used, make sure you did set range correctly
  
    [libx264 @ 0x249c3b0] using cpu capabilities: none!
  
    [libx264 @ 0x249c3b0] profile High, level 3.1
  
    [libx264 @ 0x249c3b0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=abr mbtree=1 bitrate=360 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
    [wmv3 @ 0x245da80] Extra data: 8 bits left, value: 0
  
    Output #0, mp4, to '/var/www/vhosts/domain.com/httpdocs/Protected/41000/b7fe950bc0ea5a3776c3893dc035a973.mp4':
  
      Metadata:
  
        WMFSDKNeeded    : 0.0.0.0000
  
        DeviceConformanceTemplate: MP@LL
  
        WMFSDKVersion   : 12.0.7601.17514
  
        IsVBR           : 0
  
        encoder         : Lavf55.48.100
  
        Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 426x320, q=-1--1, 360 kb/s, 24 fps, 12288 tbn, 24 tbc (default)
  
        Metadata:
  
          encoder         : Lavc55.69.100 libx264
  
        Stream #0:1(eng): Audio: aac (libfaac) ([64][0][0][0] / 0x0040), 11025 Hz, mono, s16, 64 kb/s
  
        Metadata:
  
          encoder         : Lavc55.69.100 libfaac
  
    Stream mapping:
  
      Stream #0:0 (mjpeg) -> scale (graph 0)
  
      Stream #0:2 (wmv3) -> overlay:overlay (graph 0)
  
      overlay (graph 0) -> Stream #0:0 (libx264)
  
      Stream #0:1 -> #0:1 (wmav2 (native) -> aac (libfaac))
  
    Press [q] to stop, [?] for help
  
    [mjpeg @ 0x2452690] ignoring invalid SAR: 0/0
  
    [Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 161 times
  
    frame=    1 fps=0.0 q=0.0 size=       0kB time=00:00:06.73 bitrate=   0.1kbits/s[Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 237 times
  
    frame=    1 fps=1.0 q=0.0 size=      13kB time=00:00:14.44 bitrate=   7.3kbits/s[Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 238 times
  
    frame=    1 fps=0.7 q=0.0 size=      34kB time=00:00:22.43 bitrate=  12.6kbits/s[Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 244 times
  
    frame=    1 fps=0.5 q=0.0 size=      55kB time=00:00:30.23 bitrate=  14.9kbits/s[Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 241 times
  
    frame=    1 fps=0.4 q=0.0 size=      76kB time=00:00:38.12 bitrate=  16.4kbits/s[Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 126 times
  
    frame=    2 fps=0.7 q=-1.0 Lsize=     126kB time=00:00:44.00 bitrate=  23.4kbits/s dup=0 drop=64
  
    video:3kB audio:118kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 4.045506%
  
    [libx264 @ 0x249c3b0] frame I:1     Avg QP:30.19  size:  1778
  
    [libx264 @ 0x249c3b0] frame P:1     Avg QP:34.00  size:   125
  
    [libx264 @ 0x249c3b0] mb I  I16..4: 54.1% 44.3%  1.7%
  
    [libx264 @ 0x249c3b0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4: 10.7%  0.4%  3.5%  0.0%  0.0%    skip:85.4%
  
    [libx264 @ 0x249c3b0] final ratefactor: 25.19
  
    [libx264 @ 0x249c3b0] 8x8 transform intra:44.3% inter:100.0%
  
    [libx264 @ 0x249c3b0] coded y,uvDC,uvAC intra: 20.9% 34.3% 0.2% inter: 0.0% 0.2% 0.0%
  
    [libx264 @ 0x249c3b0] i16 v,h,dc,p: 34% 20% 14% 33%
  
    [libx264 @ 0x249c3b0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  9%  6% 15% 12% 15%  9% 13% 11% 10%
  
    [libx264 @ 0x249c3b0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  8% 44% 14%  6%  4% 10%  5%  3%  5%
  
    [libx264 @ 0x249c3b0] i8c dc,h,v,p: 48% 26% 21%  5%
  
    [libx264 @ 0x249c3b0] Weighted P-Frames: Y:0.0% UV:0.0%
  
    [libx264 @ 0x249c3b0] kb/s:182.69