Recherche avancée

Sur d’autres sites (6128)

• ffmpeg php video basic uses and types

  15 mai 2014, par HackerManiac

  Can anyone give a code on how do i covert a video using ffmpeg.

  As thought currently i have only uploading system.

  vu.php(only a part is shown)

  define('UPLOAD','../../videos/');
  
      $fileName = time().$file['name']; 
  
      $target = UPLOAD.$fileName;
  
  
  
    if(move_uploaded_file($file['tmp_name'],$target)){                
  
        exec("ffmpeg -i ".UPLOAD." ".UPLOAD.$filename.".flv"); 
  
    }

  This pice of code block just uploads the video on video folder but does not converts it to .flv.
  I am not sure how to use ffmpeg.

  My diretory looks like this

  www[localhost]->videos[videos folder]
  
  www[localhost]->pictures[pictures folder]
  
  www[localhost]->resources[folder]->php[folder]->vu.php

  I also want to return a .jpg image of any frame of video through json by converting via ffmpeg and uploading it to pictures folder.

  return json_encode(array("thumbnail"=>$image_src));

  UPDATE 1

  The above stuff was solved but now i have a question regarding video conversion.
  Suppose i have a file.avi and i want to convert it in 3 sizes of .flv format -> Low(320p) ,Medium (720p)and HD(1080p)

  what commands will i have to send to shell_exec(); and will that be fast enough ?
  CUrrently what i have is

  $vidSize = "640x480";
  
  $ffmpeg -i $videoFile -ar 22050 -ab 32 -f flv -s $vidSize $vidFile

  And i am not sure what -ar and -ab means and what value will be good for all those 3 sized videos ?

• Revision ccba289f8d : Fast computation path for forward transform and quantization This commit enable

  30 mai 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/encoder/vp9_block.h

  
   Modify /vp9/encoder/vp9_context_tree.h

  
   Modify /vp9/encoder/vp9_dct.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encodemb.c

  
   Modify /vp9/encoder/vp9_encodemb.h

  
   Modify /vp9/encoder/vp9_pickmode.c

  
   Modify /vp9/encoder/vp9_quantize.c

  
   Modify /vp9/encoder/vp9_quantize.h

  
   Modify /vp9/encoder/x86/vp9_dct_sse2.c

  
  
  Fast computation path for forward transform and quantization

  This commit enables a fast path computational flow for forward
  transformation. It checks the sse and variance of prediction
  residuals and decides if the quantized coefficients are all
  zero, dc only, or more. It then selects the corresponding coding
  path in the forward transformation and quantization stage.

  It is currently enabled in rtc coding mode. Will do it for rd
  coding mode next.

  In speed -6, the runtime for pedestrian_area 1080p at 1000 kbps
  goes down from 14234 ms to 13704 ms, i.e., about 4% speed-up.
  Overall coding performance for rtc set is changed by -0.18%.

  Change-Id : I0452da1786d59bc8bcbe0a35fdae9f623d1d44e1

• ffmpeg resizing video puts it at wrong resolution

  16 décembre 2015, par agmcleod

  I have a 1080p video that i’m trying to resize for an iOS app upload. So i tried scaling it to the iPhone 6 resolution of 1334x750 :

  ffmpeg -i WrathTrailer.mp4 -strict -2 -vf scale=1334:750 WrathTrailer1334x750.mp4

  The output file comes to 1333x750. iTunes connect won’t accept it. Any ideas ?