Mp4 to Mp3 clips audio to one second.

[Johannestegner]

Hi!

I'm having an issue in my Laravel queue jobs which converts sounds from multiple formats into mp3. Most audio formats works well, while mp4 sounds uploaded from iOS devices only produce a 1 second long audio stream on conversion.
All sounds are both fetched and uploaded to a s3-like storage, which might be a part in the issue.

I have tried to reproduce the issue by only using ffmpeg directly to no avail.

Is this an issue that has been observed before, or am I doing something wrong?

This is basically the code I use to convert files:

<?php
namespace App\Services;

use App\Services\Contracts\AudioServiceInterface;
use FFMpeg\Format\Audio\Mp3;
use Illuminate\Filesystem\FilesystemManager;
use ProtoneMedia\LaravelFFMpeg\Exporters\EncodingException;
use Psr\Log\LoggerInterface;
use ProtoneMedia\LaravelFFMpeg\Support\FFMpeg;

class FFMpegService implements AudioServiceInterface {
    protected FilesystemManager $filesystem;
    private LoggerInterface     $logger;

    public function __construct(LoggerInterface $logger, FilesystemManager $filesystem) {
        $this->logger = $logger;
        $this->filesystem = $filesystem;
    }

    public function convert(string $fromPath, string $toPath): bool {

        try {
            // Default disk is a s3-like storage.
            FFMpeg::fromFilesystem($this->filesystem->disk())
                  ->open($fromPath)
                  ->export()
                  ->toDisk($this->filesystem->disk())
                  ->inFormat(new Mp3())
                  ->save($toPath);

            $this->logger->debug('Audio converted', [
                'from'       => $fromPath,
                'to'         => $toPath
            ]);

            FFMpeg::cleanupTemporaryFiles();
        } catch (EncodingException $exception) {
            $this->logger->error('Audio failed to convert', [
                'from'    => $fromPath,
                'to'      => $toPath,
                'command' => $exception->getCommand(),
                'error'   => $exception->getErrorOutput(),
            ]);

            throw $exception;
        }

        return true;
    }

}

There are no exceptions and the logs says that everything went fine, but the mp3 files are 1 second long, every time.

---

Runtime:

PHP 8.1 Ubuntu 20.04.3 Laravel 9.18 pbmedia/laravel-ffmpeg 8.1.2

FFMPEG output:

ffmpeg version 4.2.7-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Hyper fast Audio and Video encoder