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• lavf : do not derive timebase from avg_frame_rate

  5 avril 2021, par Anton Khirnov

  lavf : do not derive timebase from avg_frame_rate
  avg_frame_rate is the _average_ framerate, its presence does not
  
  guarantee that the stream is CFR, so it should not be used for setting
  
  the timebase.
  

  • [DH] libavformat/utils.c

• fluent ffmpeg progress.percent return undefined

  26 décembre 2020, par Farrel Athaillah

  let ffmpeg = require("fluent-ffmpeg")
ffmpeg.setFfmpegPath(pathToFfmpeg)     

    var command = ffmpeg(file)

    command.on('end', function() {
        return console.log("done");
    });

    command.on('error', function(err) {
        return console.log(err);
    });

    command.on('progress', function(progress) {
        console.log('Processing: ' + progress.percent + '% done');
      });

    command.save(output+filename+sel);


  


  somehow it return

  


  Processing : undefined% done

  


  Processing : undefined% done

  


  Processing : undefined% done

  


  why ? i followed the fluent-ffmpeg docs

  


• How to plot animated time series in R ?

  28 août 2016, par pOrlando

  I am trying use the ’animation’ package in R to plot an animated time series.

  My dataset consists of a time vector and a value vector, each with 1800 rows.

  I keep getting an error message after running the loop which reads :

  Error in jpeg(gname[i]) : unable to start jpeg() device
  
  In addition: Warning messages:
  
  1: In jpeg(gname[i]) : unable to open file 'g11:30:00.jpg' for writing
  
  2: In jpeg(gname[i]) : opening device failed

  Here’s the source code

  timemax<-1800
  
  setwd("~/Documents/Animation/")
  
  graphdata<-read.csv("filling_line_data_construction_v2.csv")
  
  attach(graphdata)
  
  gname<-paste("g",time, ".jpg", sep="")
  
  for (i in 1:timemax){
  
      jpeg(gname[i])
  
      plot(time[1],value[1],type="l",ylim=c(0,35), xlim=c(0,100),
  
        ylim = c(0, 35),ylab = "", xlab="time")
  
      lines(time[1:i],value[1:i])
  
      dev.off(dev.cur())
  
  }

  The end goal is to string together these 1800 plots as a stop animation video by calling the ffmpeg shell :

  shell("C:/ffmpeg/bin/ffmpeg.exe -report -i g%d.jpg -b:v 2048k fillin_lineR.mpg",mustWork=FALSE)

  This is code that I’ve been trying to adapt from http://www.animatedgraphs.co.uk/LondonR.html#slide-30, but this example uses a .tif file instead of .jpg, and my computer gives me 1800 error messages when trying to make a video from .tif files...

  Thanks in advance !