NAME App::FfmpegUtils - Utilities related to ffmpeg VERSION This document describes version 0.012 of App::FfmpegUtils (from Perl distribution App-FfmpegUtils), released on 2022-09-22. FUNCTIONS cut_video_by_duration Usage: cut_video_by_duration(%args) -> [$status_code, $reason, $payload, \%result_meta] Get a portion (time range) of a video. Examples: * Specify start only, the result is 100s.cut_40_to_100.mp4: cut_video_by_duration(files => ["100s.mp4"], start => "40s"); * Specify duration only (using percentage) of two files, the results are 100s.cut_0_to_30.mp4 & 50s.cut_0_to_15.mp4: cut_video_by_duration(files => ["100s.mp4", "50s.mp4"], duration => "30%"); * Specify end only (using h:m:s notation), the result is 100s.cut_0_to_63.mp4: cut_video_by_duration(files => ["100s.mp4"], end => "00:01:03"); * Specify start & end only (using h:m:s notation), the result is 100s.cut_50_to_63.mp4: cut_video_by_duration(files => ["100s.mp4"], end => "00:01:03", start => "00:00:50"); * Specify start & duration only (using seconds), the result is 100s.cut_50_to_63.mp4: cut_video_by_duration(files => ["100s.mp4"], duration => 13, start => 50); * Specify end & duration only (using human & ISO 8601 notation), the result is 100s.cut_50_to_63.mp4: cut_video_by_duration(files => ["100s.mp4"], duration => "13s", end => "PT63S"); This utility uses *ffmpeg* (particularly the "-t" and "-ss") option to get a portion (time range) of a video. Compared to using "ffmpeg" directly, this wrapper offers convenience of more flexibility in specifying times and duration (e.g. '15s' as well as '00:10' as well as 'PT1M30S'), specifying only 'end' and 'duration', handling multiple files, automatically choosing output filename, and tab completion. This function is not exported. This function supports dry-run operation. Arguments ('*' denotes required arguments): * copy => *bool* Whether to use the "copy" codec (fast but produces inaccurate timings). * duration => *duration|percent_str* * end => *duration|percent_str* * files* => *array[filename]* * start => *duration|percent_str* Special arguments: * -dry_run => *bool* Pass -dry_run=>1 to enable simulation mode. Returns an enveloped result (an array). First element ($status_code) is an integer containing HTTP-like status code (200 means OK, 4xx caller error, 5xx function error). Second element ($reason) is a string containing error message, or something like "OK" if status is 200. Third element ($payload) is the actual result, but usually not present when enveloped result is an error response ($status_code is not 2xx). Fourth element (%result_meta) is called result metadata and is optional, a hash that contains extra information, much like how HTTP response headers provide additional metadata. Return value: (any) reencode_video_with_libx264 Usage: reencode_video_with_libx264(%args) -> [$status_code, $reason, $payload, \%result_meta] Re-encode video (using ffmpeg and libx264). This utility runs *ffmpeg* to re-encode your video files using the libx264 codec. 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. Smartphone-produced videos are often high bitrate (e.g. >10-20Mbit) and not yet well compressed, so they make a good input for this utility. 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): * audio_sample_rate => *uint* Set audio sample rate, in Hz. * crf => *int* * ffmpeg_path => *filename* * files* => *array[filename]* * frame_rate => *ufloat* Set frame rate, in fps. * preset => *str* (default: "veryslow") * scale => *str* (default: "1080^>") Scale video to specified size. See Math::Image::CalcResized or calc-image-resized-size for more details on scale specification. Some examples include: The default is "1080^>" which means to shrink to 1080p if video size is larger than 1080p. To disable scaling, set "--scale" to '' (empty string), or specify "--dont-scale" on the CLI. Special arguments: * -dry_run => *bool* Pass -dry_run=>1 to enable simulation mode. Returns an enveloped result (an array). First element ($status_code) is an integer containing HTTP-like status code (200 means OK, 4xx caller error, 5xx function error). Second element ($reason) is a string containing error message, or something like "OK" if status is 200. Third element ($payload) is the actual result, but usually not present when enveloped result is an error response ($status_code is not 2xx). Fourth element (%result_meta) is called result metadata and is optional, a hash that contains extra information, much like how HTTP response headers provide additional metadata. Return value: (any) split_video_by_duration Usage: split_video_by_duration(%args) -> [$status_code, $reason, $payload, \%result_meta] Split video by duration into parts. This utility uses ffmpeg (particularly the "-t" and "-ss") option to split a longer video into shorter videos. For example, if you have "long.mp4" with duration of 1h12m and you run it through this utility with "--every 15min" then you will have 5 new video files: "long.1of5.mp4" (15min), "long.2of5.mp4" (15min), "long.3of5.mp4" (15min), "long.4of5.mp4" (15min), and "long.5of5.mp4" (12min). Compared to using "ffmpeg" directly, this wrapper offers convenience of calculating the times ("-ss") option for you, handling multiple files, automatically choosing output filename, and tab completion. This function is not exported. This function supports dry-run operation. Arguments ('*' denotes required arguments): * copy => *bool* Whether to use the "copy" codec (fast but produces inaccurate timings). * every => *duration|percent_str* * files* => *array[filename]* * parts => *posint* Special arguments: * -dry_run => *bool* Pass -dry_run=>1 to enable simulation mode. Returns an enveloped result (an array). First element ($status_code) is an integer containing HTTP-like status code (200 means OK, 4xx caller error, 5xx function error). Second element ($reason) is a string containing error message, or something like "OK" if status is 200. Third element ($payload) is the actual result, but usually not present when enveloped result is an error response ($status_code is not 2xx). Fourth element (%result_meta) is called result metadata and is optional, a hash that contains extra information, much like how HTTP response headers provide additional metadata. Return value: (any) HOMEPAGE Please visit the project's homepage at . SOURCE Source repository is at . AUTHOR perlancar CONTRIBUTING To contribute, you can send patches by email/via RT, or send pull requests on GitHub. Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via: % prove -l If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me. COPYRIGHT AND LICENSE This software is copyright (c) 2022, 2020 by perlancar . This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. 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.