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• Grep for a number between a certain range - Checking WAV Quality

  11 août 2014, par BT643

  I’m trying to write a regular expression (to be used in conjunction with ffmpeg, which can check that a WAV file is over a certain quality.

  The minimum should be :

  Audio Channels : 2 (Stereo)
  Audio Sample Rate : 44,100 Hz
  Audio Bitrate : 1411 Kbps
  Audio Bit Depth : 16 bit
  

  So I’ve tried the following commands so far :

  • /usr/local/bin/ffmpeg -i "/path/to/file.wav" 2>&1 | egrep 'stereo|2 channels'

  This works fine to get a stero (2 channel) WAV. I’m getting issues with the next part, searching between a range of numbers.

  • /usr/local/bin/ffmpeg -i "/path/to/file.wav" 2>&1 | egrep 'stereo|2 channels' | egrep '[41000-196000] Hz'

  Obviously this just searches each number individually, so it’s finding results if there’s a 4 OR 1 OR 0 OR 0 OR 0 etc...

  The bit rate and bit depth just needs to be OVER 1411 and 16 respectively.

  Thanks

  EDIT -
  Here’s the ffmpeg output for a low quality WAV which should be rejected :

  ffmpeg version git-2012-05-22-27127eb Copyright (c) 2000-2012 the FFmpeg developers
 built on May 22 2012 12:27:21 with gcc 4.6.1
 configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab
 libavutil      51. 53.100 / 51. 53.100
 libavcodec     54. 21.101 / 54. 21.101
 libavformat    54.  6.100 / 54.  6.100
 libavdevice    53.  4.100 / 53.  4.100
 libavfilter     2. 75.100 /  2. 75.100
 libswscale      2.  1.100 /  2.  1.100
 libswresample   0. 15.100 /  0. 15.100
 libpostproc    52.  0.100 / 52.  0.100
[wav @ 0x355b140] max_analyze_duration 5000000 reached at 5056000
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, wav, from '/path/to/file.wav':
 Duration: 00:02:28.47, bitrate: 512 kb/s
   Stream #0:0: Audio: pcm_u8 ([1][0][0][0] / 0x0001), 32000 Hz, stereo, u8, 512 kb/s

• Shaka Player returns 4001 error - Node.js local web server playing MPEG-DASH

  27 mai 2020, par salgarji

  I've used Chrome inspection tool to access 'Console' and analyze what is happening. Complete error information :

  



  D {severity: 2, category: 4, code: 4001, data: Array(1), handled: false}
category: 4
code: 4001
data: Array(1)
0: "http://localhost:8080/dash_segmentos/video.mpd"
length: 1
__proto__: Array(0)
handled: false
severity: 2
__proto__: Object


  



  My Server.js file :

  



  var http = require('http');
var fs = require('fs');

console.log(__dirname);

var path='dash_segmentos/video.mpd';
fs.access(path, fs.constants.R_OK | fs.constants.W_OK, (err) => {
    if (err) {
        console.log("%s doesn't exist", path);
    } else {
        console.log('can read/write %s', path);
    }
});

const PORT=8080; 

fs.readFile('./player.html', function (err, html) {

    if (err) throw err;    

    http.createServer(function(request, response) {  
        response.setHeader("Access-Control-Allow-Headers", "authorization, content-type");
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
        response.writeHeader(200, {"Content-Type": "text/html"}); 
        response.write(html);  
        response.end();
    }).listen(PORT);
});


  



  As you can see I've added CORS (I guess it's correct) and a console.log to see if it's in the proper location. Furthermore, I've verified that file is accessible with fs.access and it returns can read/write dash_segmentos/video.mpd For this reason, I'm sure I am in the correct path and referencing the right file.

  



  The HTML code (player.html) provided to Server.js :

  



  &#xA;&#xA; &#xA; <code class="echappe-js">&lt;script type=&quot;text/javascript&quot;&amp;#xA;src=&quot;https://cdnjs.cloudflare.com/ajax/libs/shaka-player/2.5.11/shaka-player.compiled.js&quot;&gt;&lt;/script&gt;&#xA; &#xA; &#xA; 
  &#xA; &#xA; 
  &#xA;&#xA; &lt;script&gt;&amp;#xA;function initApp() { &amp;#xA;shaka.polyfill.installAll(); &amp;#xA;if (shaka.Player.isBrowserSupported()) { &amp;#xA; initPlayer(); &amp;#xA; } else { &amp;#xA; console.error(&amp;#x27;Browser not supported!&amp;#x27;);&amp;#xA; }}&amp;#xA;&amp;#xA;function initPlayer() { &amp;#xA;var video = document.getElementById( &amp;#x27;video&amp;#x27; );&amp;#xA;var player = new shaka.Player( video );&amp;#xA; window.player = player; &amp;#xA;player.addEventListener(&amp;#x27;error&amp;#x27;, onErrorEvent); &amp;#xA;player.load(path).then(function (){&amp;#xA;    console.log(&amp;#x27;Video loaded correctly&amp;#x27;);&amp;#xA; }).catch(onError);&amp;#xA;&amp;#xA;function onErrorEvent(event) {&amp;#xA; onError(event.detail); &amp;#xA; }&amp;#xA;function onError(error) {&amp;#xA; console.error(&amp;#x27;Codigo de error: &amp;#x27;, error.code, &amp;#x27; en &amp;#x27;, error);&amp;#xA; }&amp;#xA;}&amp;#xA;&lt;/script&gt;&#xA;&#xA;&lt;script&gt;&amp;#xA;var path=&amp;#x27;dash_segmentos/video.mpd&amp;#x27;;&amp;#xA;//var path=&amp;#x27;https://dash.akamaized.net/dash264/TestCases/2c/qualcomm/1/MultiResMPEG2.mpd&amp;#x27;;&amp;#xA;//the URL above is working! but it won&amp;#x27;t read my local mpd&amp;#xA;&amp;#xA;document.addEventListener(&amp;#x27;DOMContentLoaded&amp;#x27;, initApp);&amp;#xA;&amp;#xA; &lt;/script&gt;&#xA; &#xA;&#xA;
  

  



  I've tried changing the URL to an online resource and the player is properly working.

  



  My fluent-ffmpeg command which generates the video is :

  



  var ffmpeg = require('fluent-ffmpeg');

var grabacion = new ffmpeg();

grabacion.addInput('0')
.inputOptions(['-y -nostdin', '-f avfoundation', '-video_size 1280x720', '-framerate 30'])
.outputOptions(['-vcodec libx264', '-keyint_min 0', '-g 100', '-map 0:v', '-b:v 1000k', '-f dash',
 '-use_template 1', '-use_timeline 0', '-init_seg_name video0-$RepresentationID$-$Number$.mp4',
 '-media_seg_name video0-$RepresentationID$-$Number$.mp4','-single_file 0', '-remove_at_exit 0', '-window_size 20', '-seg_duration 4'])
.output('/path/to/files/dash_segmentos/video.mpd')
.run();


  



  The mpd manifest file is :

  



  &lt;?xml version="1.0" encoding="utf-8"?>&#xA;<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediapresentationduration="PT26.7S" maxsegmentduration="PT4.0S" minbuffertime="PT13.2S">&#xA;    <programinformation>&#xA;    </programinformation>&#xA;    <servicedescription>&#xA;    </servicedescription>&#xA;    <period start="PT0.0S">&#xA;        <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="30000/1001" maxwidth="1280" maxheight="720" par="16:9">&#xA;            <representation mimetype="video/mp4" codecs="avc1.7a001f" bandwidth="1000000" width="1280" height="720" sar="1:1">&#xA;                <segmenttemplate timescale="1000000" duration="4000000" initialization="video0-$RepresentationID$-$Number$.mp4" media="video0-$RepresentationID$-$Number$.mp4" startnumber="1">&#xA;                </segmenttemplate>&#xA;            </representation>&#xA;        </adaptationset>&#xA;    </period>&#xA;</mpd>&#xA;

  



  Is something about ffmpeg ? Permissions ? Pixel format ? Encoding ? I've tried with other mpd file provided by my Raspberry Pi using video4linux (v4l) and it returns the same error !

  



  I know that's a lot of code, but maybe you find it quicker than me. I guess it's a Shaka Player thing with the XML, but I can't explain how ffmpeg is wrongly creating XML code.

  



  Thank you in advance !!

  


• PHP Create video thumbnail with FFMPEG - returns error code 1

  27 février 2013, par Light

  I am trying to create a video thumbnail with FFMPEG using the following script.
  However I am getting return value of 1. What does it mean ? What is error code 1 ? I have Googled it and didn't find and answer. Thanks.
  Here is the code :

  <?php
  
  
  
          //thumb path should be added in the below code
  
          //test for thumb
  
          $dir_img='uploads/';
  
          $mediapath='thumb.jpg';
  
          $file_thumb=create_movie_thumb('test.mp4',$mediapath,$mediaid);
  
  
  
          $name_file=explode(".",$mediapath);
  
          $imgname="thumb_".$name_file[0].".jpg";     
  
  
  
          /*
  
            Function to create video thumbnail using ffmpeg
  
          */
  
          function create_movie_thumb($src_file,$mediapath,$mediaid)
  
          {
  
  
  
              global $CONFIG, $ERROR;
  
  
  
              $CONFIG['ffmpeg_path'] = '/usr/bin/'; // Change the path according to your server.
  
              $dir_img='uploads/';
  
              $CONFIG['fullpath'] = $dir_img."thumbs/";
  
  
  
              $src_file = $src_file;
  
              $name_file=explode(".",$mediapath);
  
              $imgname="thumb_".$name_file[0].".jpg";
  
              $dest_file = $CONFIG['fullpath'].$imgname;
  
  
  
              if (preg_match("#[A-Z]:|\\\\#Ai", __FILE__)) {
  
                  // get the basedir, remove '/include'
  
                  $cur_dir = substr(dirname(__FILE__), 0, -8);
  
                  $src_file = '"' . $cur_dir . '\\' . strtr($src_file, '/', '\\') . '"';
  
                  $ff_dest_file = '"' . $cur_dir . '\\' . strtr($dest_file, '/', '\\') . '"';
  
              } else {
  
                  $src_file = escapeshellarg($src_file);
  
                  $ff_dest_file = escapeshellarg($dest_file);
  
              }
  
  
  
              $output = array();
  
  
  
              if (eregi("win",$_ENV['OS'])) {
  
                  // Command to create video thumb
  
                  $cmd = "\"".str_replace("\\","/", $CONFIG['ffmpeg_path'])."ffmpeg\" -i ".str_replace("\\","/" ,$src_file )." -an -ss 00:00:05 -r 1 -vframes 1 -y ".str_replace("\\","/" ,$ff_dest_file);
  
                  exec ("\"$cmd\"", $output, $retval);
  
                  echo "exec1";
  
  
  
              } else {
  
                  // Command to create video thumb
  
                  $cmd = "{$CONFIG['ffmpeg_path']}ffmpeg -i $src_file -an -ss 00:00:05 -r 1 -vframes 1 -y $ff_dest_file";
  
                  exec ($cmd, $output, $retval);
  
                  echo "exec2";
  
              }
  
  
  
  
  
              if ($retval) {
  
                  $ERROR = "Error executing FFmpeg - Return value: $retval";
  
                  if ($CONFIG['debug_mode']) {
  
                      // Re-execute the command with the backtick operator in order to get all outputs
  
                      // will not work if safe mode is enabled
  
                      $output = `$cmd 2>&1`;
  
                      $ERROR .= "<br /><br /><div align="\&quot;left\&quot;">Cmd line : <br /><span style="&quot;font-size:120%&quot;">" . nl2br(htmlspecialchars($cmd)) . "</span></div>";
  
                      $ERROR .= "<br /><br /><div align="\&quot;left\&quot;">The ffmpeg program said:<br /><span style="&quot;font-size:120%&quot;">";
  
                      $ERROR .= nl2br(htmlspecialchars($output));
  
                      $ERROR .= "</span></div>";
  
                  }
  
                  echo $ERROR;
  
                  @unlink($dest_file);
  
                  return false;
  
              }
  
  
  
              $return = $dest_file;
  
              //@chmod($return, octdec($CONFIG[&#39;default_file_mode&#39;])); //silence the output in case chmod is disabled
  
              return $return;
  
          } 
  
  ?>