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• ffmpeg specify image start/end time by seconds in slideshow

  31 décembre 2022, par Martin

  I have an ffmpeg command that when ran on command prompt in win10, will combine 2 mp3 files and 1 image file into a low resolution .mkv video file.

  


  06:23 = 383 = song1.mp3 length
05:40 = 340 = song2.mp3 length
12:03 = 723 = estimated total video length
12:04 = 724 = actual video length


  


  Command that generates video file :

  


  ffmpeg -loop 1 -framerate 2 -i images/img1.png  -i "audio files/song1.mp3"  -i "audio files/song2.mp3"  -c:a pcm_s32le  -filter_complex concat=n=2:v=0:a=1  -vcodec libx264  -bufsize 3M  -filter:v "scale=w=640:h=638,pad=ceil(iw/2)*2:ceil(ih/2)*2"  -crf 18  -pix_fmt yuv420p  -shortest  -tune stillimage  -t 724 audioAndImageIntoVideo.mkv 


  


  The current command just uses -i images/img1.png as a static image for the entire video. But I want to have one image for the duration of the first song, and a second image for the duration of the second song. With a timeline like so :

  


  song1.mp3 and img1.png start at 00:00 and end at 06:23 ( 383 seconds )
song2.mp3 and img2.png start at 06:23 ( 383 seconds ) and end at 12:03 ( 723 seconds )


  


  is there any flag to specify the timeline of two images ? Right now I am just trying to get them in order in a video, and then I can change the individual img resolution / size / stretching details for how it fills the frame

  


• ffmpeg Image2pipe command Stuck infinitely while taking image stream from PhantomJS

  15 mai 2019, par Link2 Video

  Let me Explain by my Code what issue i am facing...

  This is my js file for using with PhantomJS. It simple tell it to open a page and take screenshots of it and store them in stdout.

  var page = require("webpage").create();
  
  page.viewportSize = { width: 640, height: 480 };
  
  page.open("http://www.goodboydigital.com/pixijs/examples/12-2/", function() {
  
  setInterval(function() {
  
  page.render("/dev/stdout", { format: "png" });
  
  }, 25);
  
  });

  And this is the cmd command I’m running to receive the captured images in ffmpeg in Windows Command Prompt.

  phantomjs runner.js | ffmpeg -y -c:v png -f image2pipe -r 25 -t 10  -i - -c:v libx264 -pix_fmt yuv420p -movflags +faststart dragon.mp4

  This command successfully starts the processes of PhantomJS and ffmpeg. But nothing happens for quite some time, after 15 minutes it gives an error saying :

  "Failed to reallocate parser buffer"

  thats it. I have referenced this code from this site on which the developer claims that it works
  https://mindthecode.com/recording-a-website-with-phantomjs-and-ffmpeg/

  Please see the attached Image for more explanation.
  Image of Code

• FFMPEG blackdetect output

  25 juin 2018, par MertG

  I am currently working on detecting black frames in my video. I tried lots of examples on my windows own command prompt with ffmpeg and got good result. Then I started using what I learned on java platform. When I used same string on my java code, there seems to be a problem, because I get exit code 1. I print my results on txt file so ofc there is no output too since its not working. My code is below ;

      public class MyCode{
  
  public static void main(String[] args){
  
  
  
  Runtime runtime = Runtime.getRuntime();
  
  Process process = runtime.exec("C:\\Users\mg\\Desktop\\test\\ffmpeg -i C:\\Users\mg\\Desktop\\test\\video.mp4 -vf blackdetect=d=0.1:pix_th=.1 -an -f null 2> C:\\Users\mg\\Desktop\\test\\output.txt C:\\Users\mg\\Desktop\\test");
  
  
  
  BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));
  
  
  
  int exitCode = process.waitFor();
  
  System.out.println(exitCode);
  
  }

  btw this C:\\Users\mg\\Desktop\\test\\ffmpeg -i C:\\Users\mg\\Desktop\\test\\video.mp4 -vf blackdetect=d=0.1:pix_th=.1 -an -f null 2> C:\\Users\mg\\Desktop\\test\\output.txt C:\\Users\mg\\Desktop\\test
  part works on command promt but not on java.