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• Ffmpeg Scrolling end credits with transparend background from png

  30 octobre 2022, par Jan

  Trying to create an end credit video from the following large pixel png file (with transparent background). Creating the scrolling video works but the background is not transparent. What is wrong with my command ?

  


  ffmpeg -f lavfi -i color=s=1920x1080 -loop 1 -t 0.08 -i "credits.png" -filter_complex "[1:v]scale=1920:-2,setpts=if(eq(N\,0)\,0\,1+1/0.02/TB),fps=60[fg]; [0:v][fg]overlay=y=-'t*h*0.02':eof_action=endall[v]" -map "[v]" -pix_fmt yuva420p -vcodec prores_ks credits.mov


  


  The picture I am using


  


• 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 !