Sur d’autres sites (7362)

• How to create a live stream in dash format from mp4 file or m3u8 list ? (ffmpeg)

  30 juin 2017, par jorge.luengo

  I have been trying different ways of running dash live streams from mp4 or m3u8 but none of them worked fined. I want to use ffmpeg because of my server conditions.
  This command has been the one that did something but it didn’t work as I expected :

  ffmpeg-3.3.2-64bit-static/ffmpeg -i reencoded24eng.mp4 -vf yadif=0 -r 30 -vcodec libx264 -keyint_min 60 -g 60 -b:v 1000k -ac 2 -strict 2 -acodec aac -ab 64k -map 0:v -map 0:a -f dash -min_seg_duration 2000  -use_template 1 -use_timeline 1 -init_seg_name init-\$RepresentationID\$.mp4 -dash 1  -media_seg_name test-\$RepresentationID\$-\$Number\$.mp4 test.mpd

  The error that the dash-if conformance tool provides is the following one :

  Start XLink resolving

  XLink resolving successful

  Start MPD validation

  MPD validation successful - DASH is valid !

  Start Schematron validation

  location="/[local-name()=’MPD’ and namespace-uri()=’urn:mpeg:dash:schema:mpd:2011’]/[local-name()=’Period’ and >namespace-uri()=’urn:mpeg:dash:schema:mpd:2011’]">
  If the MPD is dynamic the Period element shall have an id.

  location="/[local-name()=’MPD’ and namespace-uri()=’urn:mpeg:dash:schema:mpd:2011’]/[local-name()=’Period’ and >namespace-uri()=’urn:mpeg:dash:schema:mpd:2011’]/*local[1]">
  Common attributes for AdaptationSet and Representation shall either be in >one of the elements but not in both.

  Schematron validation not successful - DASH is not valid !

  BUILD SUCCESSFUL
  Total time : 5 seconds

  Could anyone help me with this ?

• Download youtube video duration using youtube-dl PHP and ffmpeg

  21 juin 2017, par user3285828

  Is there any more efficient way to download youtube videos at a specific start and end time using youtube-dl and ffmpeg in PHP.

  I currently have this, which does work, it first downloads the whole video to an mp3 file, and then crops that file to the range I set using ffmpeg, but when I only want 30 seconds or so of a 20 minute video, waiting for the full video to download doesn’t seem the best way to do it.

  <?php
  
  require __DIR__ . '/vendor/autoload.php';
  
  
  
  use YoutubeDl\YoutubeDl;
  
  
  
  $dl = new YoutubeDl([
  
      'extract-audio' => true,
  
      'audio-format' => 'mp3',
  
      'audio-quality' => 0, // best
  
      'output' => 'videoname.%(ext)s',
  
  ]);
  
  $dl->setDownloadPath('C:\youtubevideos');
  
  $video = $dl->download('https://www.youtube.com/watch?v=oDAw7vW7H0c');
  
  
  
  $start = 60; // Start 60 seconds in to the video
  
  $duration = 30; // Get 30 seconds after $start
  
  $fullVideo = "C:\youtubevideos\videoname.mp3";
  
  $shortVideo = "C:\youtubevideos\short\shortversion.mp3"; // create 30 seconds
  
  exec("ffmpeg -ss $start -i $fullVideo -t $duration -c copy $shortVideo");
  
  exec("DEL $fullVideo");

  I am using youtube dl PHP https://github.com/norkunas/youtube-dl-php

• MPEG-DASH MPD file not playing correctly

  24 juin 2017, par CMOS

  So I am working on generating a very simple MPD manifest file for my MPEG-DASH videos and I cannot figure out what is wrong. Here is my current manifest file

  <?xml version="1.0" ?>
  
  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" minbuffertime="PT1.500S" type="static" mediapresentationduration="PT0H9M21.795S" maxsegmentduration="PT0H0M1.001S" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011">
  
      <period>
  
          <baseurl>https://mysite/uploads/sources/resolution_640/bitrate_1400/</baseurl>
  
          <adaptationset mimetype="video/mp4">
  
              <contentcomponent contenttype="video"></contentcomponent>
  
              <representation bandwidth="1400000">
  
                <segmentlist duration="119">
  
                  <initialization sourceurl="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_0.mp4"></initialization>
  
                  <segmenturl media="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_1.mp4"></segmenturl>
  
                  <segmenturl media="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_2.mp4"></segmenturl>
  
                  <segmenturl media="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_3.mp4"></segmenturl>
  
                </segmentlist>
  
              </representation>
  
          </adaptationset>
  
      </period>
  
  </mpd>

  This MPD file validates using every validator I can find. The urls for the segments are obscured for security reasons but they are all open, public and viewable individually. But when I try to run the manifest file, depending on the player I get. "No supported source found within manifest" or simply nothing happens.

  Any idea how this could be wrong ? I am currently using media url’s as absolute paths but I have also tried paths relative to the BaseURL with no luck. Any info on how I can make a very simple MPEG-Dash manifest structure would be great. I am using FFMPEG to split my video up into 150 frame segments. Thanks !