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• What does -inf LUFS mean in the output of ffmpeg ?

  17 novembre 2020, par Bailey Brightman

  I've looked through the documentation but havent been able to figure out exactly what this means. Could it be an issue with the command I'm running ?

  


  Heres the command :
-i ${filePath} -af loudnorm=I=-16:dual_mono=true:TP=-1.5:LRA=11:print_format=summary -f null - 2>&1
And heres part of the output I'm getting :

  


  Output Integrated:    -inf LUFS
Output True Peak:    -17.2 dBTP
Output LRA:            0.0 LU
Output Threshold:    -70.0 LUFS


  


  I'm trying to use this information to ensure that audio is lower than a set LUFS Value

  


• How to convert multiple video files in a specific path outputvideo with the same video name

  31 janvier, par Oussama Gamer

  The following code to converts a one video from mp4 to avi using ffmpeg

  


  ffmpeg.exe  -i "kingman.mp4"  -c copy "kingman.avi"

  


  I need to convert multiple videos in a specific path. "outputvideo" with the same video name

  


  This is the my code that needs to be modified.

  


  from pathlib import Path
import subprocess
from glob import glob

all_files = glob('./video/*.mp4')

for filename in all_files:
     videofile = Path(filename)
     outputfile = Path(r"./outputvideo/")
     codec = "copy"
     ffmpeg_path = (r"ffmpeg.exe")

outputfile = outputfile / f"{videofile.stem}"

outputfile.mkdir(parents=True, exist_ok=True)

command = [
    f"{ffmpeg_path}",
    "-i", f"{videofile}",
    "-c", f"{codec}",
    "{outputfile}",]

process = subprocess.Popen(
    command,
    stdout=subprocess.PIPE,
    stderr=subprocess.PIPE,
    text=True,
    bufsize=1,
    universal_newlines=True)
process.communicate()


  


• FFMPEG ldash 1 low latency option but dash.js not low latency and buggy with lag and start always at 0 cannot control

  7 avril 2021, par Jintor

  I can't figure out how to fix this. playing a supposed low latency mpeg-dash manifest but it's with lots of lag, and play-stop-wait-play-stop-wait....

  


  I have latest ubuntu with latest ffmpeg

  


  here the command

  


  ffmpeg -re -i file.webm -c:v libx264 -preset ultrafast -tune zerolatency -c:a aac -ac 2 -strict -2 -crf 18 -profile:v baseline -maxrate 1000k -pix_fmt yuv420p -bufsize 969k -ldash 1 -streaming 1 -use_template 0 -use_timeline 1 -seg_duration 1 -remove_at_exit 0 -f dash index.mpd


  


  and player side

  


  <code class="echappe-js">&lt;script src='http://stackoverflow.com/templates/account_js/dashjs/dash.3.1.0.min.js'&gt;&lt;/script&gt;&#xA;    
  &#xA;    &lt;script&gt;&amp;#xA;    (function(){&amp;#xA;        var url = &quot;index.mpd&quot;;&amp;#xA;        var player = dashjs.MediaPlayer().create();&amp;#xA;        player.initialize(document.querySelector(&quot;#videoPlayer&quot;), url, true);&amp;#xA;        player.updateSettings({&amp;#xA;            streaming: {&amp;#xA;                 lowLatencyEnabled: true, &amp;#xA;                 liveDelay: 3,&amp;#xA;                 liveCatchup: {&amp;#xA;                    enabled: true,&amp;#xA;                    minDrift: 0.05,&amp;#xA;                    maxDrift: 0,&amp;#xA;                    playbackRate: 0.5,&amp;#xA;                    latencyThreshold: 30    &amp;#xA;                  }&amp;#xA;            }&amp;#xA;        });&amp;#xA;    })();     &amp;#xA;    video = document.getElementById(&quot;videoPlayer&quot;);&amp;#xA;    video.addEventListener(&quot;loadedmetadata&quot;, function(){ video.muted = true; video.play(); }, false);&amp;#xA;    &lt;/script&gt;&#xA;
  

  


  but it's NOT low latency, It forces to start at 0 and cannot control the video

  


  is there a better config setup and what need to be fixed : ffmpeg options or dash.js config