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• Removal of low-noise echo from stereo phone call recordings

  7 novembre 2018, par xylophagous

  I have phone call recordings which are dual channel with each channel supposed to carry only the voice of one speaker. However, they have some echo of the other channel. Any ways to remove this, in ffmpeg or sox or otherwise.

  I am working on a Ubuntu 16.04 environment and using mplayer to play back the audio. A link to a 10s clip of the audio may be found here : https://drive.google.com/file/d/14xrchHvcluhDNGutYfCPpQi3cas_4Ogi/view?usp=sharing

  I also looked at (almost) the same question : Silence out quiet periods in audio file with ffmpeg
  Not very sure I could follow the answer/comment though.

  Thanks !

• Ffmpeg : alternating audio languages in resulting movie for language learning

  20 novembre 2020, par almachuar
  

  1. Need to convert multiple-(audio)-language-video to single-audio-stream-video where 2 languages alternate repeatedly.
(10sec Lang2) + (15sec Lang3) + (10sec Lang2) + (15sec Lang3) + ... and so on till the end.
I assume it should be done with piping in and changing audio streams. (I've read ffmpeg piping documentation but didn't quite understand it).

  


  


  I've done audio switching task (with scripting on Windows) by lively changing audio languages in video player but need better and crossplatform solution for little kid - preprepared video.

  


  

  2. If possible, to adjust loudness of one of the input audio streams to the other.

  


  


  P.S. Think it would be useful for many married (programmers) to show little kids bilingual cartoons. (To prepare for language learning). By balancing 10/15 sec you may retain kid's attention — the older they grow the more native language they demand.

  


  Irrelevant, just for what's my experience :
  
%ffmpeg% -y -f concat -safe 0 -i %playlist% -i %picture% -map:v 0 -map:v 1 -c:v copy -disposition:v:0 attached_pic -ac 1 -af aresample=resampler=soxr -ar 16000 -%title% -%album% -%artist% %lyrics% -c:a aac -q:a 1 %output%

  


• 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");    
  
    }
  
   ?>