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• FFMPEG add text frames to the start of video

  22 janvier 2021, par Ryan

  I have some videos either in mp4 or webm format, and I'd like to use ffmpeg to add 4 seconds to the start of each video to display some text in the center with no sound.

  



  Some other requirements :

  



  

  • try to avoid re-encoding the video

  


  • need to maintain the quality (resolution, bitrate, etc)

  


  • (optional) to make the text fade in/out

  


  



  I am new to ffmpeg and any help will be appreciated.

  



  thanks in advance

  



  Example ffprobe information for mp4 below :

  



  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  Metadata:
    major_brand : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.33.100
  Duration: 00:00:03.84, start: 0.042667, bitrate: 1117 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 1021 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
  handler_name    : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 140 kb/s (default)
Metadata:
  handler_name    : SoundHandler


  



  Example webm

  



  Input #0, matroska,webm, from 'input.webm':
  Metadata:
  encoder         : Lavf55.33.100
 Duration: 00:00:03.80, start: 0.000000, bitrate: 1060 kb/s
   Stream #0:0(eng): Video: vp8, yuv420p, 1280x720, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
   Stream #0:1(eng): Audio: vorbis, 48000 Hz, stereo, fltp (default)


  



  Screenshot from joined.mp4

  



  Screenshot for step 3 console

  


• airplay-js no start streaming

  24 août 2015, par Mikel David Carozzi Sanchez

  I’m writing a local file streaming over airplay protocol with subtitle support, to do that I’m using ffmpeg and the process works really fine, but the main problem is when I try to start streaming after burning the subtitle, the airplay doesn’t work, but when I comment the lines that do the burning works fine. What am I doing wrong ? Here is the code.

  var fileSource = './source.mp4';
  
  var subtitleSource = './source.srt';
  
  
  
  var http = require('http'),
  
  fs = require('fs'),
  
  util = require('util'),
  
  OS = require('os'),
  
  spawn = require('child_process').spawn,
  
  airplay = require('airplay-js');
  
  
  
  var browser = airplay.createBrowser();
  
  
  
  var tmpDir = OS.tmpdir();
  
  var tmpFile = tmpDir + '/localTV.mp4';
  
  
  
  var sourceSize;
  
  var tmpFileSize;
  
  
  
  function init(){
  
  console.log('Starting LocalTV');
  
  console.log('Burning Subtitle into ' + fileSource);
  
  
  
  var stat = fs.statSync(fileSource);
  
  sourceSize = stat.size;
  
  
  
  fs.exists(tmpFile, function(exists){
  
      if(exists) fs.unlink(tmpFile)
  
  });
  
  
  
  var ffmpeg = spawn('./ffmpeg', [
  
      '-i', fileSource,
  
      '-sub_charenc', 'CP1252',
  
      '-i', subtitleSource,
  
      '-map', '0:v',
  
      '-map', '0:a',
  
      '-c', 'copy',
  
      '-map', '1',
  
      '-c:s:0', 'mov_text',
  
      '-metadata:s:s:0', 'language=esp',
  
      tmpFile
  
  ]); 
  
  
  
  ffmpeg.stderr.pipe(process.stdout);
  
  
  
  ffmpeg.on('close', function(code){
  
      if(code == 0){
  
          console.log('Burning subtitle finished');
  
          initServer();
  
      }
  
  })
  
  
  
  ffmpeg.on('error', function(error){
  
      console.log(error, 'ffmpeg error');
  
  });
  
  
  
  //  initServer();
  
  
  
  return false;   
  
  }
  
  
  
  function initServer(){
  
  
  
  http.createServer(function (req, res) {
  
  
  
      var path = tmpFile;
  
      var stat = fs.statSync(path);
  
      var total = stat.size;
  
  
  
      if (req.headers['range']) {
  
          var range = req.headers.range;
  
          var parts = range.replace(/bytes=/, "").split("-");
  
          var partialstart = parts[0];
  
          var partialend = parts[1];
  
  
  
          var start = parseInt(partialstart, 10);
  
          var end = partialend ? parseInt(partialend, 10) : total-1;
  
          var chunksize = (end-start)+1;
  
  
  
          var file = fs.createReadStream(path, {start: start, end: end});
  
          res.writeHead(206, { 'Content-Range': 'bytes ' + start + '-' + end + '/' + total, 'Accept-Ranges': 'bytes', 'Content-Length': chunksize, 'Content-Type': 'video/mp4' });
  
          file.pipe(res);
  
  
  
        }else{        
  
  
  
          res.writeHead(200, { 'Content-Length': total, 'Content-Type': 'video/mp4' });
  
          fs.createReadStream(path).pipe(res);
  
      }
  
  
  
  }).listen(1337, '192.168.0.100', function(){
  
      console.log('HTTP Server Started');
  
      startStream();
  
  });
  
  
  
  return false;       
  
  }
  
  
  
  function startStream(){ 
  
  console.log('Streaming to AppleTV');
  
  
  
  var stat = fs.statSync(tmpFile);
  
  tmpFileSize = stat.size;    
  
  
  
  //  if(tmpFileSize >= sourceSize){
  
      browser.on('deviceOn', function(device) {
  
          device.play('http://192.168.0.100:1337', 0, function(status){
  
              console.info(status, 'Playing video');
  
          });
  
      });
  
  
  
      browser.on('error', function(err){
  
          console.log(err, 'Error airplay');
  
      })
  
  
  
      browser.start();
  
  //  }else{
  
  //      console.log('Temp file minor size that source, something is wrong');
  
  //  }
  
  
  
  return false;       
  
  }
  
  
  
  init();

• avfilter/af_afade : fix start of fade out

  8 octobre 2015, par Justin Greer

  avfilter/af_afade : fix start of fade out
  Fixes #4919
  

  • [DH] libavfilter/af_afade.c