https://github.com/rubyonworld/mp4info

MP4Info supports the reading of tags and file info from MP4 audio files.
https://github.com/rubyonworld/mp4info

audio file info mp4 reading ruby tag

Last synced: 5 months ago
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MP4Info supports the reading of tags and file info from MP4 audio files.

• Host: GitHub
• URL: https://github.com/rubyonworld/mp4info
• Owner: RubyOnWorld
• Created: 2022-09-27T15:41:02.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2022-09-28T00:53:32.000Z (over 3 years ago)
• Last Synced: 2025-07-04T06:06:19.463Z (6 months ago)
• Topics: audio, file, info, mp4, reading, ruby, tag
• Language: Ruby
• Homepage:
• Size: 117 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.rdoc

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README

          
= My Changes

This gem isn't originally mine, but i've added things etc...

= Bundler

The gem can now be used with bundler and by extension, Rails 3, just use...

	gem "mp4info", :git => "git://github.com/arbarlow/ruby-mp4info.git", :require => "mp4info"

= Introduction

MP4Info supports the reading of tags and file info from MP4 audio files.

It is based on the Perl module MP4::Info (http://search.cpan.org/~jhar/MP4-Info/)

Note: MP4Info does not currently support Unicode strings.

= License

This program is free software; you can redistribute it and/or modify

it under the terms of version 2 of the GNU General Public License as

published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

= Usage

With mp4info.rb in your load path, do:

  require 'mp4info'

Once the library is loaded, an MP4Info object is created by sending an IO

object to MP4Info#new. MP4Info also provides the MP4Info#open method, which

takes String containing a filename.

  file = "my_favorite_song.mp4"

  info = MP4Info.open(file)

  io_stream = File.new("that_other_song.m4a")

  other_info = MP4Info.new(io_stream)

Once an MP4Info object is succesfully created, a number of tags are

avalible:

  * ALB   - Album

  * APID  - Apple Store ID

  * ART   - Artist

  * CMT   - Comment

  * COVR  - Album art (typically jpeg data)

  * CPIL  - Compilation (boolean)

  * CPRT  - Copyright statement

  * DAY   - Year

  * DISK  - Disk number & total (Array of two integers)

  * GNRE  - Genre

  * GRP   - Grouping

  * NAM   - Title

  * RTNG  - Rating (integer)

  * TMPO  - Tempo (integer)

  * TOO   - Encoder

  * TRKN  - Track number & total (Array of two integers)

  * WRT   - Author or composer

The following extra information about the audio file is also provided:

  * VERSION   - MPEG version (=4)

  * LAYER     - Doesn't really mean antyhing, but here in case we need it

                for compatibility with an MP3 library...

  * BITRATE   - Bitrate in kbps (average for VBR files)

                The formula used to generate this seems a little suspect.

  * FREQUENCY - Frequency in kHz

  * SIZE      - Bytes in audio stream

  

  * SECS  - Total seconds, rounded to nearest second

  * MM    - Minutes

  * SS    - Leftover seconds

  * MS    - Leftover milliseconds, rounded to nearest millisecond

  * TIME  - Time in MM:SS, rounded to nearest second

  * COPYRIGHT	- Non-nil if audio is copyrighted

  * ENCRYPTED	- Non-nil if audio data is encrypted