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• Compiling ffmpeg : how to force it to link to a specific libx264 ?

  29 août 2012, par PaulJ

  I'm trying to compile the newest version of ffmpeg (in CentOS 5.3). I first downloaded the latest version of libx264, compiled it with --enable-static and installed it in /usr/local/. However, when I then compile ffmpeg I get this error message :

  libavcodec/libavcodec.a(libx264.o): In function `X264_init':
  
  /usr/local/src/ffmpeg/libavcodec/libx264.c:494: undefined reference to `x264_encoder_open_125'
  
  collect2: ld returned 1 exit status
  
  make: *** [ffmpeg_g] Error 1

  Searching on the net, I see that this can happen if ffmpeg is picking up an older version of libx264, which I indeed have (in /usr/lib) and can't uninstall because other pieces of software depend on it. The question is then : how can I force ffmpeg to link against the libx264 that I want ? The last time I had to do this (admittedly a year ago) I also had 2 versions of libx264, and I don't remember having to do anything special. Is there a configure switch that I'm forgetting ?

• id3 reading from mp3 files

  2 octobre 2012, par payal

  i have the below script for reading mp3 files id3.i have checked manually that id3 tags are there in mp3 files but my output always returns for few files
  MP3 file does not have any ID3 tag !. i am converting these files from ffmpeg when i run the below code for original files it shows the id3 tags but when i run for converted files (by ffmpeg) it is not showing any id3 tags . i have downloaded both original and converted file and check and found that both files is having exactly same tags but the below code give MP3 file does not have any ID3 tag !. for converted file

  here is code

   <?php
  
   $mp3 = "4.mp3"; //The mp3 file.
  
  
  
   $filesize = filesize($mp3);
  
   $file = fopen("4.mp3", "r");
  
  
  
   fseek($file, -128, SEEK_END); // It reads the 
  
  
  
   $tag = fread($file, 3);
  
  
  
   if($tag == "TAG")
  
   {
  
       $data["title"] = trim(fread($file, 30));
  
  
  
       $data["artist"] = trim(fread($file, 30));
  
  
  
       $data["album"] = trim(fread($file, 30));
  
  
  
       $data["year"] = trim(fread($file, 4));
  
  
  
        $data["genre"] = trim(fread($file, 1));
  
  
  
  
  
  
  
     }
  
     else
  
       die("MP3 file does not have any ID3 tag!");
  
  
  
     fclose($file);
  
  
  
     while(list($key, $value) = each($data))
  
     {
  
       print("$key: $value<br />\r\n");    
  
    }
  
   ?>    

• Read id3 tag from ffmpeg-converted mp3 files

  14 octobre 2012, par payal

  I have the below script for reading the id3 tag for mp3 files. I have checked manually that id3 tags are there in mp3 files but my output always returns for a few files :
  MP3 file does not have any ID3 tag!

  I am converting these files from ffmpeg. When I run the below code for original files, it shows the id3 tags, but when I run the script for converted files (by ffmpeg), it is not showing any id3 tags . I have downloaded both original and converted files and checked them and found that both files have exactly the same tags but the below code gives the error message anyway.

  Here is the code :

   <?php
  
   $mp3 = "4.mp3"; //The mp3 file.
  
  
  
   $filesize = filesize($mp3);
  
   $file = fopen("4.mp3", "r");
  
  
  
   fseek($file, -128, SEEK_END); // It reads the 
  
  
  
   $tag = fread($file, 3);
  
  
  
   if($tag == "TAG")
  
   {
  
       $data["title"] = trim(fread($file, 30));
  
  
  
       $data["artist"] = trim(fread($file, 30));
  
  
  
       $data["album"] = trim(fread($file, 30));
  
  
  
       $data["year"] = trim(fread($file, 4));
  
  
  
        $data["genre"] = trim(fread($file, 1));
  
  
  
  
  
  
  
     }
  
     else
  
       die("MP3 file does not have any ID3 tag!");
  
  
  
     fclose($file);
  
  
  
     while(list($key, $value) = each($data))
  
     {
  
       print("$key: $value<br />\r\n");    
  
    }
  
   ?>