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• ffmpeg watermark to mp4

  20 octobre 2013, par user2899426

  Trying to add a png graphic as watermark to an existing mp4 video with audio.
  But each time I produce an ouputfile there is no audio included / encoded ?
  For testing pupose i only want a small 30 second clip

   ffmpeg -t 0:0:30.0 -i 'input.mp4' -i 'logo.png' -filter_complex '[0:v][1:v]overlay[out]' -map '[out]' -b:v 5842k -c:a copy out.mp4 

  have managed to extract audio to seperate mp3 file to check codec works

  FYI built ffmpeg from gitclone
  Thanks this is driving me nuts.

• Ffmpeg http slow Startup Delay

  16 mars 2018, par Jan

  I need a http stream output with very fast start up Delay (100ms) And Constant Traffic. And I only want to use the http stream with vlc... so not for Browser usage. My input stream has a Bitrate 3-4mbit. With hls I get the 100ms switching time but not constant traffic. I already have traffic eruption... in one second high traffic and then nothing. But I need a constant output.

  So I tried it with nodejs and ffmpeg fluent but the starting time is not so good(Not so fast like hls)

  This is my

  // How to Use
  
  // 1. Create package.json with `npm init`
  
  // 2. Install dependencies with `npm i fluent-ffmpeg express`
  
  // 3. Start with `node ffmpegToWeb.js`
  
  // 4. Open VLC and "Open Network Stream".
  
  // 5. Input the following without quotes : `http://127.0.0.1:8001` and start.
  
  
  
  const ffmpeg = require('fluent-ffmpeg')
  
  const config = {
  
    port: 8001,
  
    url: 'url here'
  
  }
  
  
  
  let ffmpegObj = ffmpeg(config.url)
  
    .videoCodec('copy')
  
    .audioCodec('copy')
  
    .outputOptions([
  
      '-y',
  
      '-ac 2',
  
      '-sn',
  
      '-f mpegts'
  
    ])
  
    .inputOptions([
  
      '-re',
  
      '-nostdin',
  
      '-hide_banner',
  
      '-probesize 5000000',
  
      '-analyzeduration 15000000'
  
    ])
  
    .on('start', function (commandLine) {
  
      console.log('Starting ffmpeg with command: ' + commandLine)
  
    })
  
    .on('error', (err) => {
  
      console.log('ffmpeg error', err)
  
    })
  
    .on('end', () => {
  
      console.log('ffmpeg end')
  
    })
  
    .on('progress', (stats) => {
  
      // console.log(stats)
  
    })
  
  let currentChunk = {}
  
  let ffstream = ffmpegObj.pipe()
  
  ffstream.on('data', (buffer) => {
  
    currentChunk = buffer
  
    process.emit('ffmpeg-data', buffer)
  
  })
  
  
  
  // web app
  
  console.log('Starting Express Web Server on Port ' + config.port)
  
  const express = require('express')
  
  const app = express()
  
  const http = require('http')
  
  const httpServer = http.createServer(app)
  
  
  
  app.get('/', function (req, res) {
  
    console.log('client connected:', req.headers['user-agent'])
  
    let contentWriter = (buffer) => {
  
      res.write(buffer)
  
    }
  
    res.setHeader('Connection', 'close')
  
    res.setHeader('Cache-Control', 'no-cache')
  
    res.setHeader('Pragma', 'no-cache')
  
    res.setHeader('Content-Type', 'video/mp2t')
  
  
  
    // write current chunk before the first data event occurs
  
    if (currentChunk.length > 0) {
  
      res.write(currentChunk)
  
    }
  
    process.on('ffmpeg-data', contentWriter)
  
  
  
    req.on('close', function () {
  
      console.log('client disconnected:', req.headers['user-agent'])
  
      process.removeListener('ffmpeg-data', contentWriter)
  
    })
  
  })
  
  
  
  httpServer.listen(config.port) 

• Why can't Chrome 83 play this AV1 encoded video ?

  25 mai 2020, par Slbox

  The file plays great in VLC.

  



  I've tried adding the codecs="av01.0.05M.08" to the video source, but no luck - no browser will play it, despite what's stated here : https://caniuse.com/#feat=av1

  



  The video was encoded like so :

  



  ffmpeg -i input.avi -pix_fmt yuva420p -f nut -c:v libaom-av1 -minrate 1k -b:v 350k -maxrate 2000k -strict experimental output.mp4


  



  Browser console :

  



  


  • Chrome gives no hint whatsoever as to why it won't play. Firefox gives some minor clues.

  


  • Firefox shows the below

  


  



  Media resource https://example.com/example.mp4 could not be decoded. example.mp4


  



  Media resource https://example.com/example.mp4 could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006)
Details: static MP4Metadata::ResultAndByteBuffer __cdecl mozilla::MP4Metadata::Metadata(mozilla::ByteStream *): Cannot parse metadata


  



  Any advice on where I'm going wrong, either in understanding or in encoding arguments, would be greatly appreciated !