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• Converting RGB to YUV, + ffmpeg

  10 juillet 2012, par TheSHEEEP

  I am trying the following to record a live video from my Flash/AIR application :

  1. I take a "screenshot" (BitmapData from stage) each frame.

  2. I convert each pixel to yuv format like this (V2) :

         var file :File = new File(_appUrl + "/creation/output.raw");
     
         var fs :FileStream = new FileStream();
     
         fs.open(file, FileMode.WRITE);
     
         var finalY :ByteArray = new ByteArray();
     
         var finalU :ByteArray = new ByteArray();
     
         var finalV :ByteArray = new ByteArray();
     
         var rect :Rectangle = new Rectangle(0, 0, 600, 700);
     
         var pixels :ByteArray;
     
         var pixel :uint;
     
         var r :uint;
     
         var g :uint;
     
         var b :uint;
     
         _screenBuffer = _screenBuffer.reverse();
     
         while (_screenBuffer.length > 0)
     
         {
     
             pixels = BitmapData(_screenBuffer.pop()).getPixels(rect);
     
             pixels.position = 0;
     
             // Convert and save each pixel
     
             for (var x:int = 0; x < 600; x++)
     
             {
     
                 for (var y:int = 0; y < 700; y++)
     
                 {
     
                     // Convert to yuv
     
                     pixel = pixels.readUnsignedInt();
     
                     r = pixel >> 16 & 0xff;
     
                     g = pixel >> 8 & 0xff;
     
                     b = pixel & 0xff;
     
                         // Y' is written for each pixel
     
                     finalY.writeByte(0.257 * r + 0.504 * g + 0.098 * b + 128);
     
                         // U and V are written once per 2x2 pixel block
     
                     if (x % 2 == 0 && y % 2 == 0)
     
                     {
     
                         finalU.writeByte(-0.148 * r - 0.291 * g + 0.439 * b + 128);
     
                         finalV.writeByte(0.439 * r - 0.368 * g - 0.071 * b + 128);
     
                     }
     
                 }
     
             }
     
         }
     
         // Write the converted bytes to the file
     
         finalY.position = 0;
     
         finalU.position = 0;
     
         finalV.position = 0;
     
         fs.writeBytes(finalY, 0, finalY.length);
     
         fs.writeBytes(finalU, 0, finalU.length);
     
         fs.writeBytes(finalV, 0, finalV.length);
     
         fs.close();

  3. I use the following line of ffmpeg to convert the raw file to a video :

     ffmpeg -r 30 -pix_fmt yuv420p -s 600x700 -vcodec rawvideo -f rawvideo -i output.raw -y test.mp4 

  A video is created, but it is simply a mess, barely resembling what was recorded. I know that the capturing process works, as I have tried the same BitmapData "screenshots" with the SimpleFlvWriter.

  So, either something is wrong with my conversion or with the ffmpeg line, but I have no idea.

  This is what ffmpeg outputs when creating the video, maybe it can help someone :

  libavutil      51. 39.100 / 51. 39.100
  
  libavcodec     54.  3.101 / 54.  3.101
  
  libavformat    54.  1.100 / 54.  1.100
  
  libavdevice    53.  4.100 / 53.  4.100
  
  libavfilter     2. 62.101 /  2. 62.101
  
  libswscale      2.  1.100 /  2.  1.100
  
  libswresample   0.  7.100 /  0.  7.100
  
  libpostproc    52.  0.100 / 52.  0.100
  
  [rawvideo @ 01D39FC0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, rawvideo, from 'output.raw':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 600x700, 30 tbr,
  
  30 tbn, 30 tbc
  
  [buffer @ 01D3FEC0] w:600 h:700 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
  
  [libx264 @ 0375DB80] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE 4.2 AVX
  
  [libx264 @ 0375DB80] profile High, level 3.1
  
  [libx264 @ 0375DB80] 264 - core 120 r2146 bcd41db - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 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=0rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'test.mp4':
  
    Metadata:
  
      encoder         : Lavf54.1.100
  
      Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 600x700, q=-1--1, 30 tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
  Press [q] to stop, [?] for help
  
  Truncating packet of size 630000 to 1
  
  frame=   48 fps=  0 q=-1.0 Lsize=     157kB time=00:00:01.53 bitrate= 837.3kbits/s
  
  video:156kB audio:0kB global headers:0kB muxing overhead 0.687626%
  
  [libx264 @ 0375DB80] frame I:3     Avg QP:23.15  size: 23480
  
  [libx264 @ 0375DB80] frame P:38    Avg QP:28.80  size:  2169
  
  [libx264 @ 0375DB80] frame B:7     Avg QP:29.61  size:   833
  
  [libx264 @ 0375DB80] consecutive B-frames: 79.2%  4.2%  0.0% 16.7%
  
  [libx264 @ 0375DB80] mb I  I16..4: 41.4%  6.2% 52.4%
  
  [libx264 @ 0375DB80] mb P  I16..4: 10.6%  3.3%  0.9%  P16..4: 68.4%  1.3%  1.2% 0.0%  0.0%    skip:14.2%
  
  [libx264 @ 0375DB80] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 13.3%  2.2%  0.7% direct: 1.9%  skip:81.9%  L0:51.6% L1:47.4% BI: 1.0%
  
  [libx264 @ 0375DB80] 8x8 transform intra:16.7% inter:31.2%
  
  [libx264 @ 0375DB80] coded y,uvDC,uvAC intra: 14.7% 25.5% 22.3% inter: 1.0% 4.1% 3.4%
  
  [libx264 @ 0375DB80] i16 v,h,dc,p: 87% 11%  2%  0%
  
  [libx264 @ 0375DB80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  3% 18% 75%  1%  0%  1%  1% 0%  0%
  
  [libx264 @ 0375DB80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6% 74% 12%  1%  1%  1%  2% 1%  2%
  
  [libx264 @ 0375DB80] i8c dc,h,v,p: 51% 45%  4%  1%
  
  [libx264 @ 0375DB80] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0375DB80] ref P L0:  4.6%  0.4% 94.6%  0.3%
  
  [libx264 @ 0375DB80] ref B L0: 96.0%  4.0%
  
  [libx264 @ 0375DB80] ref B L1: 96.5%  3.5%
  
  [libx264 @ 0375DB80] kb/s:793.39

  I'm not really a codec expert (just starting ;)), so I don't know what to make of most of that.

  Here is a zip that contains one of the frames and the video output. What should be visible is a green smiling pear, without any artifacts. Remember the size is 600x700 and the format yuv420. Best to view such raw image files with irfanview, IMO. Don't mind the noise, its from pushing against my microphone ;)

• My FFMPEG throws me unexpected errors while writing a Thumbnail to the songs

  4 mars 2019, par Harmonised7

  I am using Node to execute my ffmpeg. I use this wrapper :

  https://www.npmjs.com/package/ffmpeg

  Everything was fine when I was using smaller versions of the thumbnails provided by Youtube, but when I attempted the HD ones, it suddenly started giving me an error. I’ve tried -pix_fmt yuv422p and Many other pixel formats, but nothing helped. Though ONE out of 100+ songs did tag successfully.

  here is my code :

  downloadTags(tags.thumbnail, `./thumbnails/${tags.title}.jpg`).then(thumbnail =>
  
                      {
  
                          video.addCommand('-i', `"${thumbnail}"`);
  
                          video.addCommand('-map', '0');
  
                          video.addCommand('-map', '1');
  
                          video.addCommand('-c', 'copy');
  
                          video.addCommand('-c:v:1', 'png');
  
                          video.addCommand('-disposition:v:0', 'attached_pic');
  
                          if(tags.title)
  
                              video.addCommand('-metadata', `title="${tags.title}"`);
  
                          if(tags.artist)
  
                              video.addCommand('-metadata', `artist="${tags.artist}"`);
  
                          if(tags.id)
  
                              video.addCommand('-metadata', `comment="https://www.youtube.com/watch?v=${tags.id}"`);
  
                          video.addCommand('-pix_fmt', `yuv422p`);
  
  
  
  
  
                          var output = 'downloaded'
  
                          if (outFolder)
  
                          {
  
                              output = outFolder;
  
                              if(!fs.existsSync(output)) fs.mkdirSync(output);
  
                          }
  
  
  
                          video.save(`"./${output}/${tags.title}.${tags.format}"`, function (error, file) 
  
                          {
  
                              if (error)
  
                              {
  
                                  resolve(error);
  
                                  return
  
                              }
  
                              try
  
                              {
  
                                  fs.unlinkSync(song);
  
                              }
  
                              catch(err)
  
                              {
  
                                  console.log(err.code);
  
                              }
  
                              resolve();
  
  
  
                          });
  
                      });
  
  
  
                  }

  and here is my error :

  E

  RROR: Error: Command failed: ffmpeg -i "songs/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a" -y  -i "./thumbnails/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].jpg" -map 0 -map 1 -c copy -c:v:1 png -disposition:v:0 attached_pic -metadata title="&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep]" -metadata artist="AReallyLongAndAwesomeNameThatIsBetterThanYoursInEveryPossibleWay" -metadata comment="https://www.youtube.com/watch?v=HprdvIIpR-I" "./written/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a"
  
  ffmpeg version N-93214-g7e4d3dbe18 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8.2.1 (GCC) 20190212
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    libavutil      56. 26.100 / 56. 26.100
  
    libavcodec     58. 47.102 / 58. 47.102
  
    libavformat    58. 26.101 / 58. 26.101
  
    libavdevice    58.  6.101 / 58.  6.101
  
    libavfilter     7. 48.100 /  7. 48.100
  
    libswscale      5.  4.100 /  5.  4.100
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000002213366bb00] stream 0, timescale not set
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'songs/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a':
  
    Metadata:
  
      major_brand     : M4A
  
      minor_version   : 512
  
      compatible_brands: isomiso2
  
      title           : &I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep]
  
      artist          : Cider Party
  
      encoder         : Lavf58.18.104
  
      comment         : https://www.youtube.com/watch?v=HprdvIIpR-I
  
    Duration: 00:05:24.80, start: 0.000000, bitrate: 127 kb/s
  
      Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 120x90 [SAR 1:1 DAR 4:3], 90k tbr, 90k tbn, 90k tbc
  
  Input #1, image2, from './thumbnails/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 1575 kb/s
  
      Stream #1:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 480x360 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (mjpeg (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 00000221353d4fc0] deprecated pixel format used, make sure you did set range correctly
  
  [ipod @ 00000221336703c0] Could not find tag for codec png in stream #2, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Error initializing output stream 0:2 --
  
  Conversion failed!

  Keep in mind that All of my thumbnails retrieved are .jpg

  Any suggestions ? Getting really desperate at this point...

• How to sell Piwik services without any confusion ?

  10 octobre 2017, par InnoCraft — Plugins

  As you may know, Piwik is a Free software under the GPL license which guarantees you :

  • The freedom to run the program for any purpose.
  • The freedom to study how it works and change it.
  • The freedom to improve the program, and release your changes.
  • The freedom to redistribute it under the GPL license, and to sell it if you wish.

  In this article we will focus on the Free aspect of Piwik, which is how to rebrand Piwik, how to offer your clients a better experience, and possibly how to make a profit from it ?

  How to sell Piwik services as an agency ?

  As a web analytics software, Piwik is often installed by web agencies when it comes to designing a brand new website for a given customer.
  Most of the time agencies are using Piwik for the following reasons :

  • free of charge
  • data ownership
  • user privacy compliance
  • feature rich while easy to use
  • open source

  Most of the agencies are charging their customers for the installation process, tracking code implementation, analysing reports to get insights about users… but do you know that you could also sell the software as your own brand ? This is where the “White Label” plugin, developed by the InnoCraft company, comes into play.

  White labelling for Piwik

  Creating a “white label” plugin came into the mind of InnoCraft founders when they realized that on any modern Piwik installation, the following components were visible :

  • Piwik branded widgets within the dashboards
  • Piwik marketplace plugin teasers on the admin page
  • Piwik help and support pages
  • the “Piwik” word in general
  • Piwik Mobile app banners

  

  Example of Piwik branded widgets

  In order to remove all those mentions of Piwik and to start selling this web analytics under your own name, you can either hack Piwik on your own (it is going to take you some precious time and money) or have a look at the White Label plugin on the marketplace where InnoCraft has solved all the challenges already for you.

  The White Label plugin is straightforward. Once downloaded and installed, you will have access to a dedicated interface where you will be able to change the Piwik name by a new custom brand of your choice :

  

  Piwik White Label settings

  Once you click Save, all “Piwik” mentions will be substituted by your company name/service :

  

  Here the Piwik version is changed by the name of the company

  How to make your installation even more customized ?

  Few Piwik users know about this trick, but since 2014 the Piwik templates can be customized through Themes. You are free to design your own template, installing existing ones, or even monetize them through the marketplace :

  

  A simple example of how Piwik can be easily customized, here fonts and colours are changed

  If you want to know how you can tweak your existing template and make it match your brand and image, just follow our theme documentation. A simple theme with your colors can be built in a few minutes simply by defining different color codes. You can also browse the public themes on the Marketplace.

  Get White Label for Piwik

  Tell us your story

  If you are an agency or any business related in selling Piwik services, we recommend having a look at our FAQ for rebranding, selling, reusing, re-licensing, and including Piwik in my offering. Are you interested or already re-selling Piwik services ? We would love to hear your story and write a blog post about it.

  Write for Piwik

  Do not hesitate to contact the Piwik core team, we’re looking forward to hearing from you.