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• How to extract specific audio track (track 2) from mp4 file using ffmpeg ?

  3 mai 2019, par flash

  I am working on a mp4 file (36017P.mp4) in which I want to extract Track 2 -[English] using ffmpeg.

  

  I tried with the following command on terminal but it seems to extract Track 1 - [English] :

  ffmpeg -i 36017P.mp4 filename.mp3

  Problem Statement :

  I am wondering what changes I need to make in the ffmpeg command above so that it extract Track 2 -[English] from mp4 file.

• avcodec/aom_film_grain : implement AFGS1 parsing

  26 février 2024, par Niklas Haas

  avcodec/aom_film_grain : implement AFGS1 parsing
  Based on the AOMedia Film Grain Synthesis 1 (AFGS1) spec :
  
    https://aomediacodec.github.io/afgs1-spec/
  The parsing has been changed substantially relative to the AV1 film
  
  grain OBU. In particular :
  1. There is the possibility of maintaining multiple independent film
  
     grain parameter sets, and decoders/players are recommended to pick
  
     the one most appropriate for the intended display resolution. This
  
     could also be used to e.g. switch between different grain profiles
  
     without having to re-signal the appropriate coefficients.
  2. Supporting this, it's possible to *predict* the grain coefficients
  
     from previously signalled parameter sets, transmitting only the
  
     residual.
  3. When not predicting, the parameter sets are now stored as a series of
  
     increments, rather than being directly transmitted.
  4. There are several new AFGS1-exclusive fields.
  I placed this parser in its own file, rather than h2645_sei.c, since
  
  nothing in the generic AFGS1 film grain payload is specific to T.35, and
  
  to compartmentalize the code base.
  

  • [DH] libavcodec/aom_film_grain.c
  • [DH] libavcodec/aom_film_grain.h

• How to use ffmpeg and javascript for user to add input box inside of a video

  23 janvier 2016, par Donalda Donalda

  I work on my website and the problem i faces is that i cant find a working way to get the chance for a user to drag an input box and set it into video specifying duration for the item.

  so i have a video and a textbox and my problem is when i grag the box i want it to stck to the video and stay there.

  Code is here :

      
  
      
  
      
  
      <code class="echappe-js">&lt;script&gt;<br />
  
          function allowDrop(ev) {<br />
  
              ev.preventDefault();<br />
  
          }<br />
  
  <br />
  
          function drag(ev) {<br />
  
              ev.dataTransfer.setData(&quot;text&quot;, ev.target.id);<br />
  
          }<br />
  
  <br />
  
          function drop(ev) {<br />
  
              ev.preventDefault();<br />
  
              var data = ev.dataTransfer.getData(&quot;text&quot;);<br />
  
              ev.target.appendChild(document.getElementById(data));<br />
  
          }<br />
  
      &lt;/script&gt;