YouTube-dl unknown file format + no support tag

[coolguruji]

Hi,

I am using youtube-dl with php and converting yt video in mp3.
I have found two different ways of doing it.
First is:
youtube-dl --extract-audio --audio-format mp3 video url
It works without any issue but it generates high load on server so i am not comfortable with it.

Second is:
youtube-dl -f 140 -e -g video url
This just fetch the audio/mp4 url with title, dont generate high load and it is very fast so i just give users download by setting php headers like

    header('Content-Description: File Transfer');
    header("Content-Type: audio/mpeg");	
    header('Content-Type: application/force-download');
    header('Content-Transfer-Encoding: binary'); 
    header('Content-disposition: attachment; filename="'.$title.'.mp3"'); 
    header('Connection: Keep-Alive');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
    header("Cache-Control: private", false);
    header('Pragma: no-cache');
    readfile($videopath);
    exit;

on my pc / windows it works but few of my customers are reporting that its no playing in their pc.
When i checked most of files at http://mp3val.sourceforge.net/ windows edition.
I found that files generated with first one command gives no error but files which are created by 2nd command are having issues. like unknown file formats / No supported tags in the file etc.
I dont know how to fix it.

Actually my problem is i dont want to download the whole file in mp4/webm and then convert it to mp3 via ffmpeg. It takes a lot of time. I am looking for a easier solution. so i just started to fetch audio/mp4 link and then rename it as a mp3 file with php headers but maybe i forget to fix something.

Is it possible to directly fetch mp4/audio link and turn in into a mp3 file without saving on the server?

[dstftw]

Youtube does not serve mp3 so it's technically impossible to download mp3 directly. Second case is incorrect, you won't get mp3 that way.

[coolguruji]

Hmm,

I agree with you. I also believe that.
But when i look here, i get confused.
http://solohits.net/mostrando.php?metodo=W0yp3rSfx3I
OPCIÓN MP3 4, OPCIÓN MP3 5

This API provider is giving multiple mp3 links of youtube. And the best thing is its available for download instantly. I dont think its possible to download + convert multiple links instantly.
Can you explain?