NAME App::FfmpegUtils - Utilities related to ffmpeg VERSION This document describes version 0.003 of App::FfmpegUtils (from Perl distribution App-FfmpegUtils), released on 2020-06-04. FUNCTIONS reencode_video 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. It is a wrapper to simplify invocation of ffmpeg. It selects the appropriate ffmpeg options for you, allows you to specify multiple files, and picks appropriate output filenames. It also sports a "--dry-run" option to let you see ffmpeg options to be used without actually running ffmpeg. This utility is usually used to reduce the file size (and optionally video width/height) of videos so they are smaller, while minimizing quality loss. The default setting is roughly similar to how Google Photos encodes videos (max 1080p). 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), this utility first checks each input video if it is indeed larger than the requested final size. If it is, then the "-vf scale" option is added. This utility also calculates a valid size for ffmpeg, since using "-vf scale=-1:720" sometimes results in failure due to odd number. 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* (default: "1080p") Downsizing will only be done if the input video is indeed larger then the target downsize. To disable downsizing, set "--downsize-to" to '' (empty string), or specify on "--dont-downsize" on the CLI. * 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) HOMEPAGE Please visit the project's homepage at . SOURCE Source repository is at . BUGS Please report any bugs or feature requests on the bugtracker website 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. AUTHOR perlancar COPYRIGHT AND LICENSE 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.