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• How to extract audio tracks from a stream using FFMPEG or other tools ?

  17 septembre 2023, par Vassili Bagrov

  Here is the stream link that I am trying to download.

  


  I can download the video, but for some reason it doesn't include the audio stream.

  


  The audio stream is also in .ts format and has 1569 chunks.

  


  When I downloaded all the audio files, I tried to convert them in single temp.ts file to them convert it into an mp3 file with this command :

  


  cat audio_7e42e066-9f6c-44f4-9ac8-10b50c3edfae_*.ts > temp.ts


  


  I tried to then convert it into an mp3 file with this command :

  


  ffmpeg -i temp.ts -acodec copy out.mp3


  


  But got an error :

  


  temp.ts: Invalid data found when processing input


  


  What are my options to download audio files ? There are actually 3 audio tracks if I watch the video from the website.
Please tell me there is a way to do it other than screen record the whole video.

  


• FFMpeg HLS to MXF video codec copy non monotonically increasing dts issue

  22 juin 2023, par arlovande

  I am rewrapping an HLS stream as an mxf file. The HLS is 1080p59.94 10bit 4:2:2. The mxf is a video codec copy and an audio conversion to pcm. The stream has video timecode burn-in for me to watch the video frames. Here is the command

  


  ffmpeg -i "https://myinput/index.m3u8" -f segment -timecode "01:01:01:00" -segment_time 600 -reset_timestamps 1 -c:v copy output_%03d.mxf


  


  I get the following non-fatal error

  


  "Application provided invalid, non monotonically increasing dts to muxer in stream 1"


  


  The file is still created, however. In VLC the file plays correctly frame by frame. But in Adobe premiere when I play frame by frame I get video stuttering and I see the timecode burn in plays in a sequence like this... 3 frames ahead, then 2 frames back... so the frame sequence would be something like ;03 ;01 ;02 ;06 ;04 ;05 ;09 ;07 ;08

  


  It's almost like Premiere does not know how to order the frames back together but VLC does. Any thoughts on how I might change the command to reorder the dts monotonically ?

  


  When I wrap to a .ts file I don't get this issue in Premiere, but I need MXF because Premiere can play an MXF file as a growing file.

  


• Node.js Stream Mp3 to http without having to save file

  21 août 2016, par user2758113

  I am trying to stream just audio from a youtube link straight to http with node.js.

  My code looks like this, I am using express 4.0.

  var express = require('express');
  
  var router = express.Router();
  
  var ytdl = require('ytdl');
  
  var ffmpeg = require('fluent-ffmpeg');
  
  var fs = require('fs');
  
  
  
  router.get('/', function(req, res) {
  
  
  
    var url = 'https://www.youtube.com/watch?v=GgcHlZsOgQo';
  
    var video = ytdl(url)
  
  
  
    res.set({
  
        "Content-Type": "audio/mpeg"
  
    })
  
  
  
    new ffmpeg({source: video})
  
        .toFormat('mp3')
  
        .writeToStream(res, function(data, err) {
  
          if (err) console.log(err)
  
        })
  
  
  
  });
  
  
  
  module.exports = router;

  Now, I’m able to stream the video’s audio to the response if I save the file then pipe it to the response, but I’d rather try to figure out some way to go from downloading to ffmpeg to response.

  Not sure if this is possible. The main goal is to keep it as light weight as possible, and not have to read from files.

  I’ve seen this code which is essentially what I’d like to do minus the saving to a file part.