Advice request: not enough memory for large audio

[Kink03]

Hi, I tried to get a transcription for a large audio (1h).
My system fails: not enough memory.

What is the best process?
Splitting the audio in 5mn and processing each?

Thanks for your advice.

[CodeWithKyrian]

Before transcription, when reading the audio, the samples are loaded into a PHP array (as floating-point numbers) at least for now. For longer audio files, this means more data needs to be held in memory. Depending on the length of the audio and the sampling rate, the memory usage can exceed the default memory limit set in most PHP installations, which is typically 128MB.

This is expected behavior when working with large audio files though. To handle it, you can increase the memory limit in your script to ensure the entire audio file can be processed at once.

Add this to the top of your script:

<?php

ini_set('memory_limit', '1G'); // Sets the memory limit to 1GB
// or
ini_set('memory_limit', -1); // Removes the memory limit entirely (use with caution)

[Kink03]

I forgot to tell you that I already tested with ini_set.
But it fails anyway.

[CodeWithKyrian]

What are your sytems specs?

[Kink03]

I'm using this french host: https://www.o2switch.fr/hebergement-entreprise/

PHP release : 8.3.14

=== System env===
Linux taupe.o2switch.net 4.18.0-513.9.1.lve.el8.x86_64 #1 SMP Mon Dec 4 15:01:22 UTC 2023 x86_64
Architecture : 64-bit

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total used free shared buff/cache available
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Swap: 11Gi 3,2Gi 8,8Gi

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SHLVL => 1
MANPATH => /usr/share/man:
MODULEPATH => /etc/scl/modulefiles:/usr/share/Modules/modulefiles:/etc/modulefiles:/usr/share/modulefiles
LOGNAME => *******
MODULEPATH_modshare => /usr/share/Modules/modulefiles:2:/etc/modulefiles:2:/usr/share/modulefiles:2
PATH => /home//.local/bin:/home//bin:/home//.pyenv/shims:/home//.pyenv/bin:/home//.local/bin:/usr/local/cpanel/3rdparty/lib/path-bin:/usr/share/Modules/bin:/usr/local/cpanel/3rdparty/lib/path-bin:/usr/local/jdk/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/usr/local/bin:/usr/X11R6/bin:/root/bin:/opt/bin:/opt/cpanel/composer/bin:/home/*/ffmpeg/ffmpeg-7.0.2-amd64-static
MODULESHOME => /usr/share/Modules
HISTSIZE => 1000
OPENSSL_NO_DEFAULT_ZLIB => 1

PHP Variables

Variable => Value
$_SERVER['LS_COLORS'] => rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=01;05;37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:.tar=01;31:.tgz=01;31:.arc=01;31:.arj=01;31:.taz=01;31:.lha=01;31:.lz4=01;31:.lzh=01;31:.lzma=01;31:.tlz=01;31:.txz=01;31:.tzo=01;31:.t7z=01;31:.zip=01;31:.z=01;31:.dz=01;31:.gz=01;31:.lrz=01;31:.lz=01;31:.lzo=01;31:.xz=01;31:.zst=01;31:.tzst=01;31:.bz2=01;31:.bz=01;31:.tbz=01;31:.tbz2=01;31:.tz=01;31:.deb=01;31:.rpm=01;31:.jar=01;31:.war=01;31:.ear=01;31:.sar=01;31:.rar=01;31:.alz=01;31:.ace=01;31:.zoo=01;31:.cpio=01;31:.7z=01;31:.rz=01;31:.cab=01;31:.wim=01;31:.swm=01;31:.dwm=01;31:.esd=01;31:.jpg=01;35:.jpeg=01;35:.mjpg=01;35:.mjpeg=01;35:.gif=01;35:.bmp=01;35:.pbm=01;35:.pgm=01;35:.ppm=01;35:.tga=01;35:.xbm=01;35:.xpm=01;35:.tif=01;35:.tiff=01;35:.png=01;35:.svg=01;35:.svgz=01;35:.mng=01;35:.pcx=01;35:.mov=01;35:.mpg=01;35:.mpeg=01;35:.m2v=01;35:.mkv=01;35:.webm=01;35:.ogm=01;35:.mp4=01;35:.m4v=01;35:.mp4v=01;35:.vob=01;35:.qt=01;35:.nuv=01;35:.wmv=01;35:.asf=01;35:.rm=01;35:.rmvb=01;35:.flc=01;35:.avi=01;35:.fli=01;35:.flv=01;35:.gl=01;35:.dl=01;35:.xcf=01;35:.xwd=01;35:.yuv=01;35:.cgm=01;35:.emf=01;35:.ogv=01;35:.ogx=01;35:.aac=01;36:.au=01;36:.flac=01;36:.m4a=01;36:.mid=01;36:.midi=01;36:.mka=01;36:.mp3=01;36:.mpc=01;36:.ogg=01;36:.ra=01;36:.wav=01;36:.oga=01;36:.opus=01;36:.spx=01;36:.xspf=01;36:
$_SERVER['MODULES_RUN_QUARANTINE'] => LD_LIBRARY_PATH LD_PRELOAD
$_SERVER['LANG'] => fr_FR.UTF-8
$_SERVER['HISTCONTROL'] => ignoredups
$_SERVER['HISTTIMEFORMAT'] => %F %T
$_SERVER['HOSTNAME'] => taupe.o2switch.net
$_SERVER['S_COLORS'] => auto
$_SERVER['which_declare'] => declare -f
$_SERVER['MODULES_CMD'] => /usr/share/Modules/libexec/modulecmd.tcl
$_SERVER['USER'] => *******
$_SERVER['PWD'] => /home//whisperphp
$_SERVER['HOME'] => /home/*
$_SERVER['TMPDIR'] => /home//tmp2
$_SERVER['LOADEDMODULES'] =>
$_SERVER['MAIL'] => /var/spool/mail/
$_SERVER['TERM'] => xterm-256color
$_SERVER['PYENV_SHELL'] => bash
$_SERVER['SHLVL'] => 1
$_SERVER['MANPATH'] => /usr/share/man:
$_SERVER['MODULEPATH'] => /etc/scl/modulefiles:/usr/share/Modules/modulefiles:/etc/modulefiles:/usr/share/modulefiles
$_SERVER['LOGNAME'] => *******
$_SERVER['MODULEPATH_modshare'] => /usr/share/Modules/modulefiles:2:/etc/modulefiles:2:/usr/share/modulefiles:2
$_SERVER['PATH'] => /home//.local/bin:/home//bin:/home//.pyenv/shims:/home//.pyenv/bin:/home//.local/bin:/usr/local/cpanel/3rdparty/lib/path-bin:/usr/share/Modules/bin:/usr/local/cpanel/3rdparty/lib/path-bin:/usr/local/jdk/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/usr/local/bin:/usr/X11R6/bin:/root/bin:/opt/bin:/opt/cpanel/composer/bin:/home//ffmpeg/ffmpeg-7.0.2-amd64-static
$_SERVER['MODULESHOME'] => /usr/share/Modules
$_SERVER['HISTSIZE'] => 1000
$_SERVER['OPENSSL_NO_DEFAULT_ZLIB'] => 1
$_SERVER['LESSOPEN'] => ||/usr/bin/lesspipe.sh %s
$SERVER[''] => /usr/local/bin/php
$_SERVER['OLDPWD'] => /home/******
$_SERVER['PHP_SELF'] => phpinfo.php
$_SERVER['SCRIPT_NAME'] => phpinfo.php
$_SERVER['SCRIPT_FILENAME'] => phpinfo.php
$_SERVER['PATH_TRANSLATED'] => phpinfo.php
$_SERVER['DOCUMENT_ROOT'] =>
$_SERVER['REQUEST_TIME_FLOAT'] => 1734016278.0266
$_SERVER['REQUEST_TIME'] => 1734016278
$_SERVER['argv'] => Array
(
[0] => phpinfo.php
)

$_SERVER['argc'] => 1