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• Overlay with fade in-out not showing

  3 mai 2018, par Pier Giorgio Misley

  I can actually add an overlay image in the center of a video from a start time A to an end time B.

  Reading here and there I tried to add a fade-in/fade-out effect to my overlayed image but the result is the image not showing at all in my final video.

  This is my "experiment" :

  -i output.mp4 -i 1.png -filter_complex "[1:v]format=rgba,scale=300:300,fade=in:st=0:d=1:alpha=1,fade=out:st=5:d=1[im];[0][im]overlay=(main_w-overlay_w)/2:(main_h - overlay_h) / 2:enable='between(t,0,5)'" -pix_fmt yuv420p -c:a copy output_0.mp4

  If in understood :

  fade=in:st=0:d=1

  Means that the image should appear at 0’’ with a fade-in effect of 1’’ duration

  fade=out:st=5:d=1

  Means that the image should disappear at 5’’ with a fade-out effect of 1’’ duration

  Isn’t it ?

  Second part would be to add a zoom effect of the image when it is fading in, can I combine the fade-in and the zoom effect toghether ?

  I think that something like this should zoom for a duration of 3 seconds my image overlay, can I add it with another "," separating the filter to the overlayed image ?

  zoompan=z='if(lte(zoom,1.0),1.5,max(1.001,zoom-0.0015))':d=3

  Thanks

  edit :

  The video is 10 sec long. I want an image to be shown with fade in-out and zoom in from 0 to 5 and another from 5 to 10 with the same effect

  Step 1 : adding fade in-out

  -i 0_vid.mp4 -loop 1 -t 1 -i 1.png -filter_complex "[1:v]format=rgba,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[im];[0][im]overlay=(main_w-overlay_w)/2:(main_h - overlay_h)/2:shortest=1" -pix_fmt yuv420p -c:a copy output_0.mp4

  With this solution the fade in works, but the fade out is not even taken in consideration.

  If I add the zoom :

  -i 0_vid.mp4 -loop 1 -t 1 -i 1.png -filter_complex "[1:v]format=rgba,zoompan=z='if(lte(zoom,1.0),1.5,max(1.3875,zoom-0.0015))':d=625,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[im];[0][im]overlay=(main_w-overlay_w)/2:(main_h - overlay_h)/2:shortest=1" -pix_fmt yuv420p -c:a copy output_0.mp4

  This way the image is stretched full screen width and the height is cut. But during the 5 sec animation the image is not resized as normal.

  What I’m aiming for is the image to be zoomed in the video but not to be cut/stretched. I would like to have the image to look smaller at the start and bigger at the end. Is it possible ?

  And also, what am I doing wrong with fade out animation

• ffmpeg install within existing Node.js docker image

  1er septembre 2021, par Peza

  I need to use ffmpeg in a Node.js application that runs in a docker container (created using docker-compose). I'm very new to Docker, and would like to know how to command Docker to install ffmpeg when creating the image.

  



  DockerFile

  



  FROM node:carbon
WORKDIR /usr/src/app

# where available (npm@5+)
COPY package*.json ./
RUN npm install -g nodemon
RUN npm install --only=production
COPY . .

EXPOSE 3000
CMD [ "npm", "start" ] 


  



  package.json :

  



  {
  "name": "radcast-apis",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node ./bin/www",
    "dev": "nodemon --inspect-brk=0.0.0.0:5858 ./bin/www"
  },
  "dependencies": {
    "audioconcat": "^0.1.3",
    "cookie-parser": "~1.4.3",
    "debug": "~2.6.9",
    "express": "~4.16.0",
    "firebase-admin": "^5.12.1",
    "http-errors": "~1.6.2",
    "jade": "~1.11.0",
    "morgan": "~1.9.0"
  },
  "devDependencies": {
    "nodemon": "^1.11.0"
  }
}


  



  docker-compose.yml :

  



  version: "2"
services:
  web:
    volumes:
    - "./app:/src/app"
    build: .
    command: npm run dev
    ports:
    - "3000:3000"
    - "5858:5858"


  


• Merge mp4 file with ffmpeg

  7 mars 2014, par user3156324

  I have two mp4 files i.e. a.mp4 and a1.mp4, I have to merge both the files into c.mp4 using ffmpeg.

  So how can do this..

  Thanks

  Actually I have two mp4 files that one contain video+audio and one contain only video,
  So I have to combine both the files means play both the files at same time. I not mean concate (add one after another ) the file.