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• plot freezedetect and blackdetect graphs ffmpeg

  7 juillet 2021, par Anup

  I want to plot freezedetect and blackdetect responses from ffmpeg onto a graph. Is there any method to do it ?

  


  Example : A line graph with frames/ seconds in the x-axis, that will have a value 1 when no freeze or black screen, and 0 when it detects an anomaly.

  


  Any pointers would be helpful. Thanks in advance.

  


• 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.

• ffmpeg - conditional blur of area based on colour

  23 mai 2021, par Silentfury

  Is it somehow possible in FFmpeg to blur areas of a video based on their colour value ?

  


  For example, all pixels of a video considered "green" should get a box blur

  


  Alternatively, I could also think of blurring the entire video but the blurring strength of each pixel/area should depend on the amount of "green"

  


  Is there some clever filter magic for that ?