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• How to speed up ffmpeg when working with multiple files ?

  6 mai 2019, par OBX

  I have 100,000 files which I need to convert from .mp3 to .wav . However, at the moment it takes 1 minute to convert 10 files each of 1 hour duration.

  Here’s what I tried :

  for i in *.mp3
  
  do
  
       ffmpeg -i "$i" -acodec pcm_s16le -ac 1 -ar 16000 "stm/$(basename -s .mp3 "$i").wav"
  
  done

  Also tried GNU parallel as well, which takes same time as well :

  find ./set/ -name "*.mp3" | parallel 'ffmpeg -i {} -acodec pcm_s16le -ac 1 -ar 16000 {.}.wav'

  Is there a better hack to process the same in less time ?

• How to increase compression speed for FFmpeg ?

  30 décembre 2022, par Maroti

  I have used following command for compress video in android.

  



  ffmpeg -y -i /sdcard/DCIM/Camera/VID_20150326_125017.mp4 -strict experimental -s 640x360 -r 25 -vcodec mpeg4 -b 1000k -ab 48000 -ac 2 -ar 22050 /sdcard/videokit/out.mp4


  



  Above command is a work properly, but it's taking too much time for compression.
An 80MB video file takes around 3 minutes to compress to an 8MB file. Is there any way I can reduce this time.

  


• how to get time bitrate, q and speed from ffmpeg using ffprobe ?

  24 décembre 2016, par user2631534

  i im using node js that creates and start ffmpeg for restream using pipe function that works but i im unable to get from stdout.pipe ffmpeg informations about started stream : bitrate, speed, time and q.

  this is what i get when i start ffmpeg using : ./ffmpeg -i http://serverip :/stream1.ts

  frame= 710 fps = 65 q=1.0 Lsize = 4974kB time=00:00:28.33 bitrate = 1437.9kbits/s speed = 2.61x

  and i would like to read into string this parameters so that i can write in mysql database and later show in datatables info...how to get frame, fps, q, time, bitrate and speed value into javascript variable so that i can use it later ?

  i im starting ffmpeg using this :

  function listener(id, stream_url) {
  
                  /* LISTENER - ffmpeg */
  
                  streams[id].on('close', function() {
  
                      /* START - stream */
  
                      stream(id, stream_url);
  
                  });
  
              }
  
  
  
              function stream(id, stream_url) {
  
                  /* START - ffmpeg */
  
                  streams[id] = child_process.spawn(process.env.PWD + "/node_modules/ffmpeg-static/bin/linux/x64/ffmpeg", [
  
                      "-re",                                                              /* STREAM - realtime    */
  
                      "-y",                                                               /* OVERWRITE - output file */
  
                      "-hide_banner",                                                     /* BANNER - hide        */
  
                      "-loglevel", "quiet",                                               /* LOG    - hide        */
  
                      "-i", stream_url,                                                   /* STREAM - source      */
  
                      "-vcodec", "copy",
  
                      "-reset_timestamps", "1",
  
                      "-movflags", "frag_keyframe+empty_moov",
  
                      "-f", "mpegts",
  
                      "-"
  
                  ], { detached: false });
  
  
  
                  /* LISTENER - ffmpeg */
  
                  listener(id, stream_url);
  
              }
  
  
  
              /* LOOP - throught all streams */
  
              for (var i in rows) {
  
                  /* CHECK - ffmpeg */
  
                  if (!streams[rows[i].id])  {
  
  
  
                      /* START - stream */
  
                      stream(rows[i].id, rows[i].stream);
  
                  };
  
              };

  And showing stream using :

  streamRoutes.get('/stream2', function(req, res) {
  
  /* STREAM - header */
  
  res.writeHead(200, {
  
    'Content-Type': 'video/H264'
  
  });             
  
  
  
  /* PIPE - stream to client */
  
  streams[2].stdout.pipe(res);
  
  
  
  ffprobe(streams[2].stdout, { path: ffprobeStatic.path }, function (err, info) {
  
  
  
          console.log(info);
  
      });

  }) ;

  i try using ffprobe input stream as stdout from ffmpeg that is read from memory but i get undefined in console.log....

  UPDATED QUESTION :

  i save file using this code to HDD and then read frpm fluent-ffmpeg-extended metadata and i im getting correct JSON data (duration, bitrate, resolution, time etc...) but i would like not to save stream to HDD to get informations...i would like to get from memory stream and get this informations...but fluent-ffmpeg-extended accept only local input file on HDD not stream (http link), how can i enter stream link into fluent-ffmpeg to get this infomations from memory (stdout.pipe) ?

  var inputfile = "http://myserverip/stream/ -vcodec copy -f mpegts 1.ts";
  
  var exec = require('child_process').exec;
  
  exec("/root/mediaxtream-codes/node_modules/ffmpeg-static/bin/linux/x64/ffmpeg" + ' -i ' + inputfile, function(err, stdout, stderr) {
  
      console.log(stdout);
  
  });
  
  
  
  function check() {
  
      var Metalib = require('fluent-ffmpeg-extended').Metadata;
  
      var metaObject = new Metalib("1.ts", function(metadata, err) {
  
          console.log(require('util').inspect(metadata, false, null));
  
      });
  
      setTimeout(check, 1000);
  
  };
  
  setTimeout(check, 1000);

  And form console.log in terminal i get correct informations every seconds :

  { ffmpegversion: '3.1',
  
  title: '',
  
  artist: '',
  
  album: '',
  
  track: '',
  
  date: '',
  
  durationraw: '00:02:02.08',
  
  durationsec: 122,
  
  synched: false,
  
  major_brand: undefined,
  
  video: 
  
   { container: 'mpegts',
  
     bitrate: 2058,
  
     codec: 'h264',
  
     resolution: { w: 1280, h: 720 },
  
     resolutionSquare: { w: 1280, h: 720 },
  
     rotate: 0,
  
     fps: 25,
  
     stream: 0,
  
     aspectString: '16:9',
  
     aspect: 1.7777777777777777,
  
     pixelString: '1:1',
  
     pixel: 1 },
  
  audio: { codec: 'mp2', bitrate: 384, sample_rate: 48000, stream: 0 } }