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• ffmpeg transparent background with colorkey shows background bleeding

  2 novembre 2022, par Jan

  I am creating a video with transparent background video with the following command. After creation I want to overlay this video on another video

  


  ffmpeg -f lavfi -i color=red:s=1920x1080,colorkey=red,format=rgba -loop 1 -t 0.08 -i "CreditWhite.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 yuva444p10le -vcodec prores_ks credits.mov


  


  Creating the video works fine but when I overlay this on another video (using openshot) I get a lot of color bleeding of the background colour around the edges. Any suggestions to improve the ffmpeg prompt to stop this from happening ? I tried very slightly increasing the opacity (0.06) as mentioned in another thread without success.
Video uploaded to youtube for reference

  


  UPDATE

  


  Using different colours had the same effect


  


• ScreenRecording a headless browser using xvfb with ffmpeg or jmf jar(java) shows distorted video in container, if the resolution greaterthan 1024x768

  4 août 2022, par Vigneshwar A S

  I am getting a proper video output, if i used to record a screen resolution for about 1024x768(max) or lesser. but
whenever i used to increase the resolution like "1600x900 or 1920x1080 or greater than
1024x768 (approx.)", i am getting distorted video.

  


  distorted image(frame of a video) with 1600x900 resolution
https://i.stack.imgur.com/iajzC.png

  


  1600x900 video information : https://i.stack.imgur.com/yutDq.png

  


  proper image(frame of a video) with 1024x768 resolution
https://i.stack.imgur.com/NcUt1.png

  


  1024x768 video information : https://i.stack.imgur.com/TeaW7.png

  


  I am using Xvfb & [both ffmpeg and jmf jar (either)] to record a headless browser inside docker container.

  


  I am getting a proper output, if i used to screen record an actual display(monitor), I am facing this issue only when i record the display inside docker (specifically headless browser) by using x11grab.

  


  To Start the Xvfb and ScreenRecording

  


  


  Xvfb :5 -screen 0 1600x900x16 &

  


  ffmpeg -nostdin -hide_banner -nostats -loglevel panic -video_size
1600x900 -framerate 30 -f x11grab -i :5 output.mp4 &

  


  


  if i replaced 1600x900 with 1024x768 or lesser than this, it is providing a proper video without any distortion.

  


  Am I missing anything ??

  


  Please help !

  


  


  Thanks for your time

  


  


• I'm trying to merge videos using fluent-ffmpeg, but some times it merges videos , but whenever we tries to merge videos second time it shows error

  9 janvier 2024, par Asif Mujawar

  const express =require('express')
const app = express()
const ffmpeg = require('fluent-ffmpeg')
const ffmpegPath = require('@ffmpeg-installer/ffmpeg')
const ffprobe = require('@ffprobe-installer/ffprobe')

const first = './videos/first.mp4'
const second = './videos/second.mp4'
const third = './videos/third.mp4'
const fourth = './videos/fourth.mp4'

ffmpeg.setFfprobePath(ffprobe.path)
ffmpeg.setFfmpegPath(ffmpegPath.path)

app.use(express.json())

app.use("/",(req,res)=>{
    res.send("hello")

    ffmpeg()
    .input(first)
    .input(second)
 
    .on('end', function() {
      console.log('files have been merged succesfully');
    })
    .on('error', function(err) {
      console.log('an error happened: ' + err.message);
    })
    .mergeToFile("final.mp4")
  })
  

app.listen(8800,()=>{
    console.log("backend is running 8800")
})



  


  but it shows error whenever we try to merge videos second time

  


  an error happened : ffmpeg exited with code 1 : Cannot find a matching stream for unlabeled input pad 3 on filter Parsed_concat_0

  


  an error happened : ffmpeg exited with code 1 : Cannot find a matching stream for unlabeled input pad 3 on filter Parsed_concat_0