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• Trouble getting HTML5 vidio to play, in Firefox 33

  16 janvier 2015, par Randy

  I’m preparing to update some old pages to HTML5, and was surprised to see that it worked in Chrome, but not the latest Firefox (v.33.1... also tried v.32). What is odd is this... In Firefox it actually WILL play IF you "coax it". If you move the video position slider to someplace beyond the start (about 5 seconds in) and THEN click play, all is well. Further inspection showed that when I click play, the file pointer was jumping to the end of the file leaving my "poster" photo intact, leading the viewer to think there is nothing else they can do. If, however, you manually move the pointer back to anyplace beyond the first couple of seconds of the file (really !), and THEN click the PLAY button, FF will play the rest of the video fine.

  Sometimes i think that to the more technically minded among us, the universe doles out the weirder problems, while God laughs.

  I’d suspect video file corruption, but all my conversions were made with the very reliable ffmpeg utility, and tested with VLC. Again, it works fine from Chrome, which supposedly uses the same video format. Here’s a link...

  FF will play the older type ogv files, so if this is one of those things where FF, now at version 33 is at fault, I’ll have to detect the browser and write the order myself with a document.write(). But it would be nice to know if there is a more straigh forward solution.

  Note that I have tried adding the mime types to my HTACESS file. But the fact that the behavior is the same when point my browsers directly the file on my local machine, makles me doubt that is the problem.

  http://pixyland.org/peterpan/OurWedding2a.html

  And here is the page code

    
  
  
  
  
  
  
  
      
  
  
  
      
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  <table align="center" border="1"><tr><td align="center">
  
  <div align="center">
  
  
  
  <video width="640" height="480" controls="controls" poster="Imagezz/Wedding/arIMG_2280.JPG">
  
   <source src="../vids/Arrival.mp4" type="video/mp4">  
  
   <source src="../vids/Arrival.webm" type="video/webm"> 
  
   <source src="../vids/Arrival.ogv" type="video/ogg"> 
  
  
  
  
  
   
  
   <p>If you are unable to view the video, here are some links to download <br />
  
    in a a few well supported video formats. You may be able to just download <br />
  
    and play one of these files without the browser.<br /><br />
  
    <strong>Download Video:</strong>nbsp;
  
      nbsp;<a href="http://stackoverflow.com/feeds/vids/Arrival.mp4">"MP4"</a>
  
      nbsp;<a href="http://stackoverflow.com/feeds/vids/Arrival.webm">"WEBM"</a>
  
      nbsp;<a href="http://stackoverflow.com/feeds/vids/Arrival.ogv">"Ogg"</a>
  
   </p>
  
  
  
   </source></source></source></video>
  
   </div>
  
   </td></tr></table>

• Why does ffmpeg have to align to the power of 2 when processing crop_left ?

  13 mai 2021, par hansionz

  If performance is considered, why doesn't crop_top \ crop_left \ crop_right perform power-of-two alignment ?
enter image description here

  


• Make FFMPEG use GPU power

  6 juillet 2022, par Raju

  I'm trying to compress some video files which are of huge size I tried using CPU power using normal command

  


    ffmpeg -i input.mp4 output.mp4


  


  My laptop also has a GPU (NVIDIA 3070 (8GB) card) so I'm trying to make video compression using it as it will be a bit faster I think

  


  I tried searching but found few but they don't use any GPU can someone write command so I can try it :)