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• extract audio with ffmpeg

  20 décembre 2014, par marcobonny88

  I need to extract audio from many mov file. I have to utilize the audios inside an iOS app, the goal is to have outputs file with low file size weight and perfectly equal sound to the input file.
  So i proceeded extrating audio in this way :

  ffmpeg -i 6.2.mov -vn -acodec aac -strict -2 try.m4a

  The input information :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '6.2.mov':
  
  Metadata:
  
   major_brand     : qt  
  
   minor_version   : 0
  
   compatible_brands: qt  
  
   creation_time   : 2014-12-03 10:12:08
  
   Duration: 00:00:01.58, start: 0.000000, bitrate: 42754 kb/s
  
  Stream #0:0(und): Video: prores (apcn / 0x6E637061), yuv422p10le(bt709), 960x540, 40383 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default)
  
  Metadata:
  
    creation_time   : 2014-12-03 10:12:08
  
    handler_name    : Core Media Data Handler
  
    encoder         : Apple ProRes 422
  
    timecode        : 00:00:00:00
  
  Stream #0:1(und): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
  
  Metadata:
  
    creation_time   : 2014-12-03 10:12:08
  
    handler_name    : Core Media Data Handler
  
  Stream #0:2(und): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
  
  Metadata:
  
    creation_time   : 2014-12-03 10:12:08
  
    handler_name    : Core Media Data Handler
  
    timecode        : 00:00:00:00

  The output information :

  Output #0, ipod, to 'try.m4a':
  
  Metadata:
  
   major_brand     : qt  
  
   minor_version   : 0
  
   compatible_brands: qt  
  
   encoder         : Lavf56.15.102
  
   Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp (24 bit), 92 kb/s (default)
  
  Metadata:
  
    creation_time   : 2014-12-03 10:12:08
  
    handler_name    : Core Media Data Handler
  
    encoder         : Lavc56.13.100 aac
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (pcm_s24le (native) -> aac (native))

  The problem is that re encoding pcm_s24le to AAC create an output that cut the some ms at the beginning.

  

  There is a way resolve or go around the problem ? Like padding the output 50ms...
  Helps ?

• Making progress bar with FFmpeg duration value

  11 novembre 2014, par user2978381

  I am mainly a back-end developer. I have rarely used javascript. But for real time update now I have to use javascript, ajax, jquery or something like that.

  My php script outputs this value "100%" at the end of the conversion.

   echo "Progress: " . $progress . "%";

  The $progress variable actually holds numeric data like 10 and I want to use this value for making progress bar. The value of the $progress variable changes every second and I need to capture this value.

  So if I want to implement this value in the following html file what will I do actually ?

  <code class="echappe-js">&lt;script src=&quot;//code.jquery.com/jquery-1.10.2.js&quot;&gt;&lt;/script&gt;
  &lt;script src=&quot;//code.jquery.com/ui/1.11.2/jquery-ui.js&quot;&gt;&lt;/script&gt;
  &lt;script&gt;<br />
  
  $(function() {<br />
  
    var progressbar = $( &quot;#progressbar&quot; ),<br />
  
      progressLabel = $( &quot;.progress-label&quot; );<br />
  
  <br />
  
    progressbar.progressbar({<br />
  
      value: false,<br />
  
      change: function() {<br />
  
        progressLabel.text( progressbar.progressbar( &quot;value&quot; ) + &quot;%&quot; );<br />
  
      },<br />
  
      complete: function() {<br />
  
        progressLabel.text( &quot;Complete!&quot; );<br />
  
      }<br />
  
    });<br />
  
  <br />
  
    function progress() {<br />
  
      var val = progressbar.progressbar( &quot;value&quot; ) || 0;<br />
  
  <br />
  
      progressbar.progressbar( &quot;value&quot;, val + 2 );<br />
  
  <br />
  
      if ( val &lt; 99 ) {<br />
  
        setTimeout( progress, 80 );<br />
  
      }<br />
  
    }<br />
  
  <br />
  
    setTimeout( progress, 2000 );<br />
  
  });<br />
  
  &lt;/script&gt;
  Loading...
  

• MAINTAINERS : Remove Tomas Härdin from mxfdec.c

  17 mai 2017, par James Almer

  MAINTAINERS : Remove Tomas Härdin from mxfdec.c
  See https://ffmpeg.org/pipermail/ffmpeg-devel/2017-May/211404.html
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] MAINTAINERS