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• FFmpeg.wasm - retrieve video metadata with node js

  29 octobre 2022, par Hugo TH

  I want to retrieve metadata from a converted video using FFmpeg web assembly package.
I tried to extract a metadata.txt file to my current directory but nothing was return from my command

  


  in my index.js file :

  


  const { createFFmpeg, fetchFile } = require('@ffmpeg/ffmpeg')

const ffmpeg = createFFmpeg({ log: true })
await ffmpeg.load()

await ffmpeg.run('-i', "myvideo.avi'", '-f', 'ffmetadata', 'metadata.txt')


  


  I got error :

  


  Output file is empty, nothing was encoded.

  


  Is this kind of command available on this wasm package ? Found nothing relevant on their documentation and I want to avoid the global FFmpeg installation

  


• Creating a video from data of server-side script

  8 mars 2016, par Peter Leupold

  My plan is to display the data that a server-side script generates in a video displayable on my web page. So far my approach is the following :

  1. A three dimensional integer array in a C script is use to accumulate the image data. Dimensions are width, breadth and color (R, G and B).
  2. The array is written to a ppm-file.
  3. The next picture is accumulated and written and so on.
  4. With ffmpeg a script merges the ppm-files to a mp4-video.

  Basically this works, but of course faster would be nicer. I would appreciate proposals for fundamentally different approaches as well as help on the following details :

  • Is there a file format simple as ppm that uses the HEX code for colors instead of triplets ? This would reduce the size of my array as well a the number of write operations.
  • Do I loose much time if I print every single value to the file with an fprintf operation instead of accumulating lines into a string ? Or do compilers optimize this kind of sequences of writes ?

• How can I get a thumbnail from a video that a user has uploaded to my server ?

  27 novembre 2013, par user3041398

  I'm working on a video sharing website where people can upload their own videos and I want the most recent uploads to be shown on the index page, but not as videos but thumbnails, so that when you click on the thumbnail you get to the video page. You guys all know how youtube's index looks/works — that's what I'm trying to simulate.

  I read about ffmpeg but it seems to me it would only work if you have ffmpeg installed on your computer. I want this to be an automated process though without the user having to first install something on their pc.
  Is there a way I can code this ? Or do i have to use some kind of framework or CMS ? Could this problem be solved by simply getting ffmpeg hosting (example) ?
  If there is no manual way to do this in php, is there way using python ?

  Fyi, my website is written in php and i use jwplayer to stream the videos.
  Please note that I want to get a thumbnail from a video that's been uploaded on my server and not a youtube or vimeo thumbnail.