Recherche avancée

Sur d’autres sites (8418)

• Loop a video with ffmpeg

  4 mars 2015, par Ellebkey

  I am triying to loop a short video using ffmpeg in python, and i have the next code :

  FFMPEG_BIN = "ffplay"
  
  
  
  import subprocess as sp
  
  import os   
  
  
  
  def playVideo(video):
  
      command = [ FFMPEG_BIN,video,'-autoexit']         
  
      pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8, stderr = sp.PIPE)
  
      pipe.wait()
  
  
  
  def playPrincipal():
  
      command = [ FFMPEG_BIN,"videos/01-bienvenida.webm","-autoexit","-an","-loop 0"]
  
      pipe2 = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8, stderr = sp.PIPE)

  but the video doesnt show on my second method, im making a body gesture recognition so the point is to show a principal video stay on a loop playPrincipal() like a background, and when I detect a position show other video in front of the first video,that part alredy works, and when the video ends the first video still playing. My second though was to make a large video and play it, but after around 1.30min the screen frezze, so the video just stop.

• Issue while generating thumbnail using ffmpeg image not syncing with the one in video

  17 janvier 2023, par Ravinarayanan

  I am trying to generate thumbnail for a video buffer using ffmpeg and pipe. The image created is not syncing with the frame in video.

  


  Below is the command am i missing anything ?

  


  args := []string"-ss", "0", //ddmmss[0],
"-i", "pipe :",
"-vframes", "1",
"-f", "image2", "pipe:1"

  


  cmd := exec.Command("../ffmpeg", args...)


  


  ---

  


  cat AAAA_BBB_2340_0.ts|./ffmpeg -ss 00:00:45 -i pipe : -vframes 1 -f image2 00-00-45-3.png

  


• ffmpeg contentiously output stream ("multiplexing")

  11 mai 2022, par Marc

  I play for fun with ffmpeg and try to create a cinema like stream.
The idea behind this is to have a contentiously/non ending output stream.

  


  As input i have 2 other streams, which are shown alternating.
For Example, stream0 is the "advertising" input, stream1 the actual movie.

  


  The question is now how do i tell ffmpeg : if stream0 has ended/paused show, stream1.

  


  This is what i have put together :

  


  const cp = require("child_process");
const fs = require("fs");

const intro = fs.createReadStream("./intro.mp4");
const video = fs.createReadStream("./video.mp4");

//intro.pause();
video.pause();

const ffmpeg = cp.spawn("/usr/bin/ffmpeg", [
    "-loglevel", "8", "-hide_banner",
    //"-progress", "pipe:3",
    "-i", "pipe:4", // intro
    "-i", "pipe:5", // video
    //"-map", "0:a",
    //"-map", "1:v",
    "-c:v", "copy",
    //"-filter_complex", "concat=n=3:v=0:a=1",
    "-y",
    `output.mp4`,
], {
    windowsHide: true,
    stdio: [
        "inherit", "inherit", "inherit",
        "pipe", "pipe", "pipe"
    ],
});

ffmpeg.on("close", () => {
    console.log("Merging Completed");
});

setTimeout(() => {

    intro.close();
    video.resume();

}, 1000);

intro.pipe(ffmpeg.stdio[4]);
video.pipe(ffmpeg.stdio[5]);


  


  The code above just takes the intro video and write it to "output.mp4". The play/pause behavior described above does not work.