App::FfmpegUtils - Utilities related to ffmpeg
This document describes version 0.001 of App::FfmpegUtils (from Perl distribution App-FfmpegUtils), released on 2020-06-03.
Usage:
reencode_video(%args) -> [status, msg, payload, meta]
Re-encode video (using ffmpeg and H.264 codec).
This utility runs ffmpeg to re-encode your video files. Usually used to reduce the file size (and optionally video width/height) so they are smaller, while minimizing quality loss.
The default settings are:
-v:c libx264 -preset veryslow (to get the best compression rate, but with the slowest encoding time) -crf 28 (0-51, subjectively sane is 18-28, 18 ~ visually lossless, 28 ~ visually acceptable)
when a downsizing is requested (using the --downsize-to option), the -vf scale option is used and this utility calculate a valid size for ffmpeg.
--downsize-to
-vf scale
Audio streams are copied, not re-encoded.
Output filenames are:
ORIGINAL_NAME.crf28.mp4
or (if downsizing is done):
ORIGINAL_NAME.480p-crf28.mp4
This function is not exported.
This function supports dry-run operation.
Arguments ('*' denotes required arguments):
crf => int
downsize_to => str
ffmpeg_path => filename
files* => array[filename]
Special arguments:
-dry_run => bool
Pass -dry_run=>1 to enable simulation mode.
Returns an enveloped result (an array).
First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.
Return value: (any)
Please visit the project's homepage at https://metacpan.org/release/App-FfmpegUtils.
Source repository is at https://github.com/perlancar/perl-App-FfmpegUtils.
Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=App-FfmpegUtils
When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.
perlancar <perlancar@cpan.org>
This software is copyright (c) 2020 by perlancar@cpan.org.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
To install App::FfmpegUtils, copy and paste the appropriate command in to your terminal.
cpanm
cpanm App::FfmpegUtils
CPAN shell
perl -MCPAN -e shell install App::FfmpegUtils
For more information on module installation, please visit the detailed CPAN module installation guide.