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• How to use fig.show=animate in knitr without administrator privileges

  23 mai 2013, par Stéphane Laurent

  I use Windows without administrator privileges hence I cannot set a path in the Windows PATH variable.

  The ffmpeg.exe file is in my "U:/ProgramFiles/ImageMagick-6.8.5-5/" folder.

  I have found how to use the saveVideo() function of the animate package :

  ani.options(ffmpeg = shQuote('U:/ProgramFiles/ImageMagick-6.8.5-5/ffmpeg.exe'))
  
  saveVideo({
  
    par(mar = rep(3, 4))
  
    for (i in seq(pi/2, -4/3 * pi, length = 12)) {
  
      plot(0, 0, pch = 20, ann = FALSE, axes = FALSE)
  
      arrows(0, 0, cos(i), sin(i))
  
      axis(1, 0, "VI"); axis(2, 0, "IX")
  
      axis(3, 0, "XII"); axis(4, 0, "III"); box()
  
    }
  
  },
  
          video.name="mavideo.mp4",
  
          outdir="U:/Data/Rtests/Animation")

  But I haven't find how to knit a Rmd file with the option fig.show=animate in a chunk, for instance :

  ```{r clock, fig.width=7, fig.height=6, fig.show='animate'}
  
  par(mar = rep(3, 4))
  
  for (i in seq(pi/2, -4/3 * pi, length = 12)) {
  
      plot(0, 0, pch = 20, ann = FALSE, axes = FALSE)
  
      arrows(0, 0, cos(i), sin(i))
  
      axis(1, 0, "VI"); axis(2, 0, "IX")
  
      axis(3, 0, "XII"); axis(4, 0, "III"); box()
  
  }
  
  ```

  I have tried to modifiy the hook_ffmpeg_html() function by only changing the ffmpeg.cmd variable :

  ```{r}
  
   hook_ffmpeg_html2 <- function (x, options) 
  
  { 
  
      ........ 
  
      ffmpeg.cmd = paste("-y", "-r", 1/options$interval, 
  
          "-i", fig.fname, mov.fname) 
  
      ffmpeg.cmd <-  paste('"U:/ProgramFiles/ImageMagick-6.8.5-5/ffmpeg"', ffmpeg.cmd) 
  
     ...... 
  
  } 
  
  opts_knit$set(animation.fun = hook_ffmpeg_html2) 
  
  ```

  But this chunk does not work, below is the error message :

  label: unnamed-chunk-1 
  
  Warning in block_exec(params) : 
  
    failed to tidy R code in chunk  
  
  reason: Error in base::parse(text = text, srcfile = NULL) : 
  
    21:14: unexpected symbol 
  
  20: options$out.height), if ("controls" %in% mov.opts) 
  
  21: "controls=\\"controls 

• exec() with SuPHP and SafeMode Off (php.ini local) show wrong path and fail execution

  29 juillet 2013, par abkrim

  Try this

  <?php
  
       if (exec('/usr/bin/ffmpeg -i 47.mp4 -acodec aac -ab 128kb -vcodec mpeg4 -b 1220kb -mbd 1 -s 320x180 final_video.mov"'))
  
           { echo "Success"; }
  
       else { echo "No good"; }
  
  ?>

  But on shell see—>

  sh: /usr/local/php/bin/ffmpeg: No such file or directory

  Server it's Apache+SuPHP with a local php.ini file for disable SafeMode

  I don't understand why show sh : /usr/local/php/bin/ffmpeg : No such file or directory instead real path put on php script.

• lavfi/overlay : show incoming frames on debug messages

  20 juin 2014, par Stefano Sabatini

  lavfi/overlay : show incoming frames on debug messages
  This is especially useful to debug queue overflow issues.
  Ideally we should be able to set the debug message at the
  
  dualinput/framesync level, but they do not have the information related
  
  to the filter context and the inlink, so cannot access much useful
  
  information.
  Signed-off-by : Stefano Sabatini <stefasab@gmail.com>
  

  • [DH] libavfilter/vf_overlay.c