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• I am using a dragable and resizable selector which is shown on top of my video. I need to get it x and y coordinates according to the video resolution

  11 août 2023, par Himanshu

  I am using @use-gesture/react @react-spring/web to create a draggable and resizable selector over the video. I am also able to get the x and y coordinates of the selector with respect to the video element but since I am giving my video tag height and width so that the video fits my screen the X and Y coordinates I am getting are not in the exact same position in the full resolution video. I need to pass the x and y coordinates to ffmpeg to blur the specific portion of the video.

  


• Getting ffmpeg to capture the full screen of xfvb-run screen running puppeteer script, and send it over rtmp

  30 janvier, par james

  My problem

  


  I can't get ffmpeg or xvfb-run to stream the full screen to ffplay/videolan, it only captures a part of the screen.

  


  Update 2

  


  I answered the question myself in a follow up answer, hopefully it can be useful for someone else with the same problem.

  


  Update 1

  


  So the problem is definitely with xvfb-run, since the two following commands, still give a webm file, that only show parts of the screen

  


  ffmpeg -f x11grab -i :99 -g 50 -b:v 4000k -maxrate 4000k -bufsize 8000k -f webm -s 384x216 "blank.webm"

  


  xvfb-run -n 99 -a --server-args="-screen 0 1024x8000x24 -ac -nolisten tcp -dpi 96 +extension RANDR" "node index.js"

  


  What I've tried

  


  

  • I've tried changing ffmpeg command and xvfb-run, for example adding "-vf format=yuv420p" or "-filter:v "crop=iw-400:ih-40,scale=960:720" to ffmpeg command

  


  • I've tried to show other applications under xvfb-run instead of puppeteer (chrome..)

  


  • Recording screen with ffmpeg and saving it to a file, to see if there's a problem with the rtmp stream

  


  


  But still no luck. That's why I'm reaching out to the stackoverflow community.

  


  xvfb-run command

  


  xvfb-run -n 99 -a --server-args="-screen 0 1024x8000x24 -ac -nolisten tcp -dpi 96 +extension RANDR" "node index.js"

  


  ffmpeg command to capture xvfb-run virtual screen

  


  ffmpeg -f x11grab -i :99 -f pulse -i default -c:v libx264 -c:a aac  -g 50 -b:v 4000k -maxrate 4000k -bufsize 8000k -f flv -listen 1 rtmp://localhost:4444/stream

  


  And finally to show the rtmp stream

  


  ffplay -fflags -nobuffer -flags low_delay -probesize 32 -flags low_delay -analyzeduration 0 -i rtmp://localhost:4444/stream

  


  The puppeteer script (index.js) which xfvb-runs

  


  

import puppeteer from 'puppeteer';
let initPuppeteer = async () => {
  const launchArgs = [
    //'--window-size=1280,1024',
    '--disable-web-security',
    '--disable-features=IsolateOrigins',
    '--disable-site-isolation-trials',
    '--app',
    '--kiosk',
  ]
  await puppeteer.launch({headless: false, ignoreDefaultArgs: ["--enable-automation"], args: launchArgs});
  const page = await this.browser.newPage();
  const device = puppeteer.devices['Nexus 10'];
  await page.emulate(device);
  await page.goto("https://google.com");
}
initPuppeteer()


  


• convert java code to android code [closed]

  16 avril 2013, par adityag

  I want to mix two audio files in android. First a song from library and second a sound recorded from mic.

  To begin with, I tried doing it on desktop using JS Resources Audio concat Program

  Using this code, I can mix/merge/overlap 2 sound wav files on desktop when i use float mix mode (-f).

  Now I was trying to do this in android environment. But found that javax.sound.sampled.* ; used in this code is not supported by android.

  Can anyone guide me how to deal with this situation ?

  PS : other approach i tried is trying to use some ffmpg. But frankly, I couldn't understand how to make it work to suit my requirement.