laravel 6.0 php-ffmpeg/php-ffmpeg alchemy/binary-driver v2.0.0 requires monolog/monolog ^1.3

laravel 6.0安装php-ffmpeg/php-ffmpeg时报如下错误：

➜  bee-api git:(master) ✗ composer require php-ffmpeg/php-ffmpeg
Using version ^0.14.0 for php-ffmpeg/php-ffmpeg
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for php-ffmpeg/php-ffmpeg ^0.14.0 -> satisfiable by php-ffmpeg/php-ffmpeg[v0.14].
    - Conclusion: remove monolog/monolog 2.0.1
    - Conclusion: don't install monolog/monolog 2.0.1
    - php-ffmpeg/php-ffmpeg v0.14 requires alchemy/binary-driver ^1.5 || ~2.0.0 || ^5.0 -> satisfiable by alchemy/binary-driver[1.5.0, 1.6.0, 5.0.0, 5.1.0, v2.0.0].
    - alchemy/binary-driver 1.5.0 requires monolog/monolog ~1.3 -> satisfiable by monolog/monolog[1.10.0, 1.11.0, 1.12.0, 1.13.0, 1.13.1, 1.14.0, 1.15.0, 1.16.0, 1.17.0, 1.17.1, 1.17.2, 1.18.0, 1.18.1, 1.18.2, 1.19.0, 1.20.0, 1.21.0, 1.22.0, 1.22.1, 1.23.0, 1.24.0, 1.25.0, 1.25.1, 1.25.2, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.9.1, 1.x-dev].
    - alchemy/binary-driver 1.6.0 requires monolog/monolog ^1.3 -> satisfiable by monolog/monolog[1.10.0, 1.11.0, 1.12.0, 1.13.0, 1.13.1, 1.14.0, 1.15.0, 1.16.0, 1.17.0, 1.17.1, 1.17.2, 1.18.0, 1.18.1, 1.18.2, 1.19.0, 1.20.0, 1.21.0, 1.22.0, 1.22.1, 1.23.0, 1.24.0, 1.25.0, 1.25.1, 1.25.2, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.9.1, 1.x-dev].
    - alchemy/binary-driver 5.0.0 requires monolog/monolog ^1.3 -> satisfiable by monolog/monolog[1.10.0, 1.11.0, 1.12.0, 1.13.0, 1.13.1, 1.14.0, 1.15.0, 1.16.0, 1.17.0, 1.17.1, 1.17.2, 1.18.0, 1.18.1, 1.18.2, 1.19.0, 1.20.0, 1.21.0, 1.22.0, 1.22.1, 1.23.0, 1.24.0, 1.25.0, 1.25.1, 1.25.2, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.9.1, 1.x-dev].
    - alchemy/binary-driver 5.1.0 requires monolog/monolog ^1.3 -> satisfiable by monolog/monolog[1.10.0, 1.11.0, 1.12.0, 1.13.0, 1.13.1, 1.14.0, 1.15.0, 1.16.0, 1.17.0, 1.17.1, 1.17.2, 1.18.0, 1.18.1, 1.18.2, 1.19.0, 1.20.0, 1.21.0, 1.22.0, 1.22.1, 1.23.0, 1.24.0, 1.25.0, 1.25.1, 1.25.2, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.9.1, 1.x-dev].
    - alchemy/binary-driver v2.0.0 requires monolog/monolog ^1.3 -> satisfiable by monolog/monolog[1.10.0, 1.11.0, 1.12.0, 1.13.0, 1.13.1, 1.14.0, 1.15.0, 1.16.0, 1.17.0, 1.17.1, 1.17.2, 1.18.0, 1.18.1, 1.18.2, 1.19.0, 1.20.0, 1.21.0, 1.22.0, 1.22.1, 1.23.0, 1.24.0, 1.25.0, 1.25.1, 1.25.2, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.9.1, 1.x-dev].
    - Can only install one of: monolog/monolog[1.12.0, 2.0.1].
    - Installation request for monolog/monolog (locked at 2.0.1) -> satisfiable by monolog/monolog[2.0.1].

是因为binary-driver要求安装monolog ^1.3版本所导致的monolog版本冲突，解决方案如下：

在安装php-ffmpeg/php-ffmpeg之前先安装monolog ^1.3版本:

composer require "monolog/monolog:^1.3"

参考：https://github.com/PHP-FFMpeg/PHP-FFMpeg/issues/674