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• avcodec/h264 : use avpriv_find_start_code() in h264_split()

  13 février 2015, par Zhaoxiu Zeng

  avcodec/h264 : use avpriv_find_start_code() in h264_split()
  This also allows replacing several literal numbers by named constants
  
  And it should be faster, the function is not speed relevant though as it is
  
  generally only called a few times at the streams start.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/h264_parser.c

• Generating random thumbnails with PHP+FFMPEG

  30 décembre 2014, par MrGhost

  I’m trying to generate thumbnails from random points in a movie using FFMPEG and FFMPEG-PHP extension.

  My script works OK.. however takes 20 minutes just to generate 5-10 thumbnails !!

  The script works by generating random numbers which are used as frame numbers later. All numbers generated are within the movies frame count.

  Can you work out why this script is taking 20 mins to finish ?
  If not, a better solution ?

  <?php
  
  
  
  //Dont' timeout
  
  set_time_limit(0);
  
  
  
  //Load the file (This can be any file - still takes ages) 
  
  $mov = new ffmpeg_movie('1486460.mp4');
  
  
  
  //Get the total frames within the movie
  
  $total_frames = $mov->getFrameCount();
  
  
  
  //Loop 5-10 times to generate random frames 5-10 times
  
  for ($i = 1; $i <= 5; ) {
  
      // Generate a number within 200 and the total number of frames.
  
   $frame = mt_rand(200,$total_frames);
  
   $getframe = $mov->getFrame($frame);
  
   // Check if the frame exists within the movie
  
   // If it does, place the frame number inside an array and break the current loop
  
   if($getframe){
  
    $frames[$frame] = $getframe ;
  
    $i++;
  
   }
  
  }
  
  
  
  //For each frame found generate a thumbnail
  
  foreach ($frames as $key => $getframe) {
  
   $gd_image = $getframe->toGDImage();
  
   imagejpeg($gd_image, "images/shot_".$key.'.jpeg');
  
   imagedestroy($gd_image);
  
   echo $key.'<br />';
  
  }
  
  
  
  ?>

  The script SHOULD be generating frame numbers which are valid ? Anything within START - END should be valid frame numbers ? Yet the loop takes ages !

• automatically run script recording video at interval using command line and ffmpg

  29 décembre 2014, par arrie

  I’m really a beginner noob newbie command line noob. But. I’m trying to create a script that automatically starts my isight camera when turning on my mac laptop. It should create clips of about 5 seconds at an interval of 5 hours or so. (These numbers I can change of course later on if I have the basis for my script).

  So what I in fact need is (i think) a launch script, that launches a video recording script.

  Right now I’m as far as my video recording script, which is not finished : camera.sh

  #!/bin/bash
  
  
  
  FNAME=videocapture_`date +"%F_%H_%M"`.mpg
  
  echo $FNAME
  
  
  
  ffmpeg -f -t "0.20avfoundation -i "" $FNAME

  ---

  This in fact records a video when I play the script in the command line, until I tell it to quit. These videos are then named according to the date etc. But of course I want it to automatically record videos, in an already determined duration. And I just can’t seem to figure out how to make it happen. I come back to different kind of scripts using isight capture, which in fact doesn’t seem to exist anymore, and even so, I would like to stay with my own basis script just because I understand it haha.

  Hopefully someone here can help me figure this out ! Much appreciated :) Thanks !