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• Piwik and Piwik PRO featured in VentureBeat Insight as “an obvious solution” for web analytics

  7 avril 2015, par Piwik Core Team — About

  We are proud to see Piwik and Piwik PRO featured in the recent report published by VentureBeat Insight. Published at the end of March 2015, Conversion Rate Optimisation : how to win at performance marketing was based on surveys of almost 3000 CRO tools users.

  

  Piwik earned a perfect score of 100 out of 100 for website analytics and was featured as an “obvious solution” for those who prefer to use open source products. The report also pointed out a very low abandonment rate of Piwik by its users, despite its growing popularity (3%).

  You can preview the “Conversion Rate Optimisation : how to win at performance marketing” report for free here
  (Note : there is a form to fill in before you can access it).

  View other awards won by Piwik here.

• How to record output frames to a video file in OpenFrameworks OF 0.8.4 OSX

  7 mai 2015, par benjgorman

  Hi I’m attempting to use this to record output of my openframeworks app.

  I was trying to use this extension here. As there seems like there is no built in method for this.

  https://github.com/timscaffidi/ofxVideoRecorder

  I have it producing a video file, but it looks like one of those scrolling sidewalk adverts, the frames scroll upwards instead of proceeding like a normal video. Any idea why ?

  I had this at the end of my setup method.

  if(!vidRecorder.isInitialized())
  
  {
  
  vidRecorder.setup(fileName+ofGetTimestampString()+fileExt, ofGetWidth(), ofGetHeight(), 30); // no audio
  
  
  
  }

  Now I had the window mode set to fullscreen intitially and that gave me scanlines on the output, so I made it not full screen and I got the frames I already mentioned and then I set it to 640, 480 and I got more scanlines.

  I was using this code in my update loop

  ofImage img;
  
  img.grabScreen(0, 0, ofGetWidth(), ofGetHeight());
  
  
  
  
  
  vidRecorder.addFrame(img.getPixelsRef());

  Here is the ffmpeg output.

  [warning] ofThread: - name: Thread 4 - Calling startThread with verbose is deprecated.
  
  [warning] ofThread: - name: Thread 2 - Calling startThread with verbose is deprecated.
  
  ffmpeg version 2.6.1 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, rawvideo, from '/Users/benjgorman/Code/OF_ROOT/addons/ofxTimeline/duplicate_lips/bin/data/ofxvrpipe0':
  
    Duration: N/A, start: 0.000000, bitrate: 566231 kb/s
  
      Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1024x768, 566231 kb/s, 30 tbr, 30 tbn, 30 tbc
  
  Please use -b:a or -b:v, -b is ambiguous
  
  Output #0, mov, to '/Users/benjgorman/Code/OF_ROOT/addons/ofxTimeline/duplicate_lips/bin/data/testMovie2015-04-16-11-21-31-504.mov':
  
    Metadata:
  
      encoder         : Lavf56.25.101
  
      Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 1024x768, q=2-31, 800 kb/s, 30 fps, 15360 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc56.26.100 mpeg4
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
  
  Press [q] to stop, [?] for help
  
  frame=    9 fps=0.0 q=14.2 size=     861kB time=00:00:00.30 bitrate=23510.3kbits/s    
  
  frame=   19 fps= 18 q=24.8 size=    1330kB time=00:00:00.63 bitrate=17202.4kbits/s    
  
  frame=   31 fps= 20 q=24.8 size=    1864kB time=00:00:01.03 

  //

  more frames here omitted for clarity

  //

  frame=   87 fps= 16 q=24.8 size=    4349kB time=00:00:02.90 bitrate=12286.0kbits/s    
  
  frame=   95 fps= 16 q=24.8 size=    4704kB time=00:00:03.16 bitrate=12169.1kbits/s    
  
  frame=  103 fps= 16 q=24.8 size=    5061kB time=00:00:03.43 bitrate=12075.1kbits/s    
  
  frame=  111 fps= 16 q=24.8 size=    5415kB time=00:00:03.70 bitrate=11990.0kbits/s    
  
  frame=  118 fps= 15 q=24.8 size=    5726kB time=00:00:03.93 bitrate=11925.3kbits/s    
  
  frame=  130 fps= 16 q=24.8 size=    6261kB time=00:00:04.33 bitrate=11835.3kbits/s    
  
  [rawvideo @ 0x10201e000] Invalid buffer size, packet size 1179648 < expected frame_size 2359296
  
  Error while decoding stream #0:0: Invalid argument
  
  frame=  138 fps= 14 q=24.8 size=    6618kB time=00:00:04.60 bitrate=11785.4kbits/s    
  
  frame=  138 fps= 14 q=24.8 Lsize=    6620kB time=00:00:04.60 bitrate=11788.8kbits/s    
  
  video:6618kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.028923%

  Is this an ffmpeg error ? Or is there a better solution.

• Knitr Plot Animation - disappearing output files ?

  20 avril 2015, par tcs

  I downloaded the latest ffmpeg (exe version), unzipped the files, renamed the directory to ffmpeg, copied the directory into c :\Program Files. I appended my PATH variable to include c :\Program Files\ffmpeg\bin. Finally, I restarted Rstudio.

  While attempting to run the following code chunk :

  ```{r perf_plot, fig.width=7, fig.height=6, fig.show='animate'}
  
  library(corrplot)
  
  corrplot(m, method = "circle")
  
  m<-sequence_2_matrix(perf_list[[1]])
  
  corrplot(m)
  
  for (i in 2:length(perf_list)) {
  
    m<-(m*(i-1)+sequence_2_matrix(perf_list[[i]]))/i
  
    corrplot(m,method = "circle")
  
  
  
  }

  I see within the output in in my RMarkdown window that the ffmpeg call seems to be successfully run, but while watching the directory where my code is located the png that is attempted to be created can often disappear, or not appear at all. Strangeness.

  processing file: MarkovRoutinesSim.rmd
  
    |........                                                         |  13%
  
    ordinary text without R code
  
  
  
    |...........                                                      |  17%
  
  label: unnamed-chunk-2
  
    |..............                                                   |  22%
  
    ordinary text without R code
  
  
  
    |.................                                                |  26%
  
  label: unnamed-chunk-3
  
    |....................                                             |  30%
  
    ordinary text without R code
  
  
  
    |.......................                                          |  35%
  
  label: unnamed-chunk-4
  
    |.........................                                        |  39%
  
    ordinary text without R code
  
  
  
    |............................                                     |  43%
  
  label: unnamed-chunk-5
  
    |...............................                                  |  48%
  
    ordinary text without R code
  
  
  
    |..................................                               |  52%
  
  label: unnamed-chunk-6
  
    |.....................................                            |  57%
  
    ordinary text without R code
  
  
  
    |........................................                         |  61%
  
  label: unnamed-chunk-7
  
    |..........................................                       |  65%
  
    ordinary text without R code
  
  
  
    |.............................................                    |  70%
  
  label: perf_plot (with options) 
  
  List of 3
  
   $ fig.width : num 7
  
   $ fig.height: num 6
  
   $ fig.show  : chr "animate"
  
  
  
  executing: ffmpeg -y -r 1 -i MarkovRoutinesSim_files/figure-html/perf_plot-%d.png MarkovRoutinesSim_files/figure-html/perf_plot-.webm
  
  ffmpeg version N-71515-ga40cee0 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --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-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      54. 22.101 / 54. 22.101
  
    libavcodec     56. 34.100 / 56. 34.100
  
    libavformat    56. 30.100 / 56. 30.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 14.100 /  5. 14.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, image2, from 'MarkovRoutinesSim_files/figure-html/perf_plot-%d.png':
  
    Duration: 00:00:00.44, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, pal8, 1344x1152 [SAR 7559:7559 DAR 7:6], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  [libvpx @ 000000000310e720] v1.4.0
  
  Output #0, webm, to 'MarkovRoutinesSim_files/figure-html/perf_plot-.webm':
  
    Metadata:
  
      encoder         : Lavf56.30.100
  
      Stream #0:0: Video: vp8 (libvpx), yuv420p, 1344x1152 [SAR 1:1 DAR 7:6], q=-1--1, 200 kb/s, 1 fps, 1k tbn, 1 tbc
  
      Metadata:
  
        encoder         : Lavc56.34.100 libvpx
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> vp8 (libvpx))
  
  Press [q] to stop, [?] for help
  
    |................................................                 |  74%
  
    ordinary text without R code
  
  
  
    |...................................................              |  78%
  
  label: unnamed-chunk-8
  
    |......................................................           |  83%
  
    ordinary text without R code
  
  
  
    |.........................................................        |  87%
  
  label: unnamed-chunk-9
  
  frame=   11 fps=0.0 q=0.0 Lsize=     108kB time=00:00:11.00 bitrate=  80.8kbits/s    
  
  video:108kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.524176%
  
    |...........................................................      |  91%
  
    ordinary text without R code
  
  
  
    |..............................................................   |  96%
  
  label: unnamed-chunk-10
  
    |.................................................................| 100%
  
    ordinary text without R code
  
  
  
  
  
  "C:/Program Files/RStudio/bin/pandoc/pandoc" MarkovRoutinesSim.utf8.md --to html --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash-implicit_figures --output MarkovRoutinesSim.html --smart --email-obfuscation none --self-contained --standalone --section-divs --template "C:\Users\Tim\Documents\R\win-library\3.2\rmarkdown\rmd\h\default.html" --variable "theme:bootstrap" --include-in-header "C:\Users\Tim\AppData\Local\Temp\Rtmpkrtekd\rmarkdown-str7d43d7d5475.html" --mathjax --variable "mathjax-url:https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" --no-highlight --variable "highlightjs=C:\Users\Tim\Documents\R\win-library\3.2\rmarkdown\rmd\h\highlight" 
  
  output file: MarkovRoutinesSim.knit.md
  
  
  
  
  
  Output created: MarkovRoutinesSim.html

  Any ideas on what might be happening ? I’ve tried adding in other graphs, and I see this random behavior of the file folder appearing disappearing, sometimes the file is created, other times not.