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• getting video duration with ffmpeg, php function

  4 avril 2020, par keithp

  I have FFMpeg installed and I know it's functional, but i'm trying to get the duration time from a flv video through PHP but when I use this code :

  



  function mbmGetFLVDuration($file)

  



  /*  
* Determine video duration with ffmpeg   
* ffmpeg should be installed on your server.  
*/  

//$time = 00:00:00.000 format   
$ffmpeg = "../ffmpeg/ffmpeg";

$time =  exec("$ffmpeg -i $file 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//");   

$duration = explode(":",$time);   
$duration_in_seconds = $duration[0]*3600 + $duration[1]*60+ round($duration[2]);   

return $duration_in_seconds;   


  



  



  and :

  



  $duration = mbmGetFLVDuration('http://www.videoaddsite.com/videos/intro.flv') ;
echo $duration ;

  



  I get an output of 220. THe video is 3:40. Can any help me on what i'm doing wrong, or if there's something else I can use ?

  


• Cut a video in between key frames without re-encoding the full video using ffpmeg ? [closed]

  13 juillet 2024, par bguiz

  I would like to cut a video at the beginning at any particular timestamp, and it need to be precise, so the nearest key frame is not good enough.

  


  Also, these videos are rather long - an hour or longer - so I would like to avoid re-encoding this altogether if possible, or otherwise only re-encode a minimal fraction of the total duration. Thus, would like to maximise the use of -vcodec copy.

  


  How can I accomplish this using ffmpeg ?

  


  NOTE : See scenario, and my own rough idea for a possible solution below.

  


  ---

  


  Scenario :

  


  

  • Original video

    

    • Length of 1:00:00

    


    • Has a key frame every 10s

    


    


  


  • Desired cut :

    

    • From 0:01:35 through till the end

    


    


  


  • Attempt #1 :

    

    • Using -ss 0:01:35 -i blah.mp4 -vcodec copy, what results is a file where :

    


    • audio starts at 0:01:30

    


    • video also starts at 0:01:30

    


    • this starts both the audio and the video too early

    


    


  


  • using -i blah.mp4 -ss 0:01:35 -vcodec copy, what results is a file where :

    

    • audio starts at 0:01:35,

    


    • but the video is blank/ black for the first 5 seconds,

      

      • until 0:01:40, when the video starts

      


      


    


    • this starts the audio on time,
but the video starts too late

    


    


  


  


  ---

  


  Rough idea

  


  

  • (1) cut 0:01:30 to 0:01:40

    

    • re-encode this to have new key frames,
including one at the target time of 0:01:35

    


    • then cut this to get the 5 seconds from 0:01:35 through 0:01:40

    


    


  


  • (2) cut 0:01:40 through till the end

    

    • without re-encoding, using -vcodec copy

    


    


  


  • (3) ffmpeg concat the first short clip (the 5 second one)
with the second long clip

  


  


  I know/ can work out the commands for (2) and (3), but am unsure about what commands are needed for (1).

  


• ffmpeg thumbnails in equal intervals

  29 juin 2013, par user2392940

  my current code

  $file= "C:/wamp/www/as.mp4"; 
  
  $ffmpeg = "C:/wamp/bin/ffmpeg/bin/ffmpeg";
  
  
  
  ob_start();
  
  passthru("$ffmpeg -i ".$file." 2>&1");
  
  $duration = ob_get_contents();
  
  ob_end_clean();
  
  
  
  $search='/Duration: (.*?)[.]/';
  
  $duration=preg_match($search, $duration, $matches, PREG_OFFSET_CAPTURE);
  
  $duration = $matches[1][0];
  
  list($hours, $mins, $secs) = preg_split('[:]', $duration);
  
  $totaltime = $secs+($mins*60)+($hours*3600);
  
  
  
  $percent = round($totaltime/12); 
  
  
  
  exec ("$ffmpeg -i $file -threads 1 -b 64k -f image2 -s 220x180 -vf fps=fps=1/$percent img%03d.jpg");

  This code works perfectly if the total time/12 remainder is equal to or less than 60 seconds. The goal here is to make 12 thumbnails in equal intervals but ffmpeg will not allow more than 1 frame per 60 seconds any suggestions ?

  Thanks