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• How to install ffmpeg for generating thumbnail images ? I got no package ffmpeg available while run on Linux(centos) terminal

  16 mai 2015, par Intrepid Uliyar

  How to install ffmpeg for generating thumbnail images ? I got "no package ffmpeg available" while run on Linux(centos) terminal by using "yum ffmpeg install" command.

  I need to install ffmpeg for generating thumbnail images, it’s working fine in localhost(Windows), but doesn’t work in Linux (I don’t know server platform). I have refer some website. In that they put like exe are not execute in linux server, we need to install ffmpeg programmatically. Can anyone give me suggestion. I have refer some website, but that wasn’t useful.

  My code :

  $video = "../../".$down_path;
  
      $rand=mt_rand(111111,999999);
  
      //where to save the image
  
      $image1 = "../../completed_project/thumb/".$rand.'ss.jpg';
  
      $image2 = "../../completed_project/thumb/".$rand.'uu.jpg';
  
      $image3 = "../../completed_project/thumb/".$rand.'rr.jpg';
  
  
  
      $thumb_image1 = "completed_project/thumb/".$rand.'ss.jpg';
  
      $thumb_image2 = "completed_project/thumb/".$rand.'uu.jpg';
  
      $thumb_image3 = "completed_project/thumb/".$rand.'rr.jpg';
  
  
  
      //time to take screenshot at
  
      $interval1 = 2;
  
      $interval2 = 4;
  
      $interval3 = 5;
  
      //screenshot size
  
      $size = '320x240';
  
  
  
      //ffmpeg command
  
      $cmd1 = "$ffmpeg -i $video -deinterlace -an -ss $interval1 -f mjpeg -t 1 -r 1 -y -s $size $image1 2>&1"; 
  
      $cmd2 = "$ffmpeg -i $video -deinterlace -an -ss $interval2 -f mjpeg -t 1 -r 1 -y -s $size $image2 2>&1";  
  
      $cmd3 = "$ffmpeg -i $video -deinterlace -an -ss $interval3 -f mjpeg -t 1 -r 1 -y -s $size $image3 2>&1";  
  
      $return = `$cmd1`.`$cmd2`.`$cmd3`;
  
      print_r($cmd1);

  I’ve got this output :

  ffmpeg.exe -i ../../completed_project/606560114793SK_PROMO-45s.mp4 -deinterlace -an -ss 2 -f mjpeg -t 1 -r 1 -y -s 320x240 ../../completed_project/thumb/362796ss.jpg 2>&1

• Cross-compile ffmpeg for arm64 on x64 host machine (macOS) ?

  13 juin 2021, par waldenCalms

  I need to cross-compile ffmpeg for arm64 (M1 Macs, to be specific) from my x64 host Mac. I am able to build ffmpeg for my host architecture without issues (i.e. I have a working x64 build script and all the pre-requisites installed), but now need to modify my script to build for arm64.

  


  First of all, is this even possible / supported ? If so, how ?

  


  The official ffmpeg compilation guide doesn't mention anything helpful. I have looked at several code snippets online and tried using the following configure arguments, with no luck :

  


  --enable-cross-compile \
--arch=arm64 \


  


  I get the following error :

  


  libavutil/aarch64/bswap.h:38:13: error: invalid instruction mnemonic 'rev'


  


• how to encode videos for the web and mobile phones using ffmpeg

  3 février 2012, par Arnar Yngvason

  I'm running a website where users can upload their videos and they are all trancoded to the same format (mp4 a.t.m.). Up until now I've been using zencoder (transcoding as a service). But I want to start transcoding the videos on my own server.

  What I would like to know is :

  • Which formats should I transcode to and which sizes are needed for the videos to play on most mobile phones ?
  • Do I actually need webm ?
  • Which is better : CRF or VRF ?
  • I would like the videos to have the same bitrate/quality as the originals. Can I set a max ?
  • Is there a max bitrate I should not exceed if I want to videos to play everywhere ?

  If someone would be so kind to write down the commands I need and explain how they work and what they do, I would be very thankful :)