MediaInfo is a class wrapping the mediainfo CLI.
$ gem install mediainfo
Parsing raw XML
media_info = MediaInfo.from(File.open('iphone6+_video.mov.xml').read)
Handling a local file
media_info = MediaInfo.from('~/Desktop/test.mov')
Handling a URL
media_info = MediaInfo.from('http://techslides.com/demos/sample-videos/small.mp4')
You can specify an alternate path for the MediaInfo Binary:
ENV['MEDIAINFO_PATH'] = "/opt/local/bin/mediainfo"
Once you have an MediaInfo object, you can start inspecting tracks:
media_info.track_types => ['general','video','audio'] media_info.track_types.count => 3 media_info.video? => true media_info.image? => nil media_info.image.filesize => MethodNotFound exception
When inspecting specific types of tracks, you have a couple general API options. The first approach assumes one track of a given type, a common scenario in many video files, for example:
media_info.video.count => 1 media_info.video.duration => 120 (seconds)
Sometimes you'll have more than one track of a given type:
The first track type name, or any track type with 1 will not contain '1'
media_info.track_types => ['general','video','video2','audio','other','other2'] media_info.track_types.count => 5 media_info.video? => true media_info.image? => nil media_info.video.count => 1 media_info.video.duration => 29855000 media_info.video.display_aspect_ratio => 1.222 media_info.other.count => 2 media_info.video2.duration => 29855000
Note that the above automatically converts MediaInfo Strings into Time, Integer, and Float objects:
media_info.video.encoded_date.class => Time media_info.video2.duration.class => Integer media_info.video.display_aspect_ratio.class => Float
Any track attribute name with "date" and matching /\d-/ will be converted using Time.parse:
media_info.video.encoded_date => 2018-03-30 12:12:08 -0400 media_info.video.customdate => 2016-02-10 01:00:00 -0600
.duration and .overall_duration will be returned as milliseconds AS LONG AS the Duration and Overall_Duration match one of the expected units (each separated by a space or not):
h (<Duration>15h</Duration>) (hour)
mn (<Duration>15hour 6mn</Duration>) (minute)
m (<Duration>15hour 6m</Duration>) (minute)
min (<Duration>15hour 6min</Duration>) (minute)
s (<Duration>15hour 6min 59s</Duration>) (second)
sec (<Duration>15hour 6min 59sec</Duration>) (second)
ms (<Duration>15hour 6min 59sec 301ms</Duration>) (milliseconds)
in the form of a Float (as for iphone mov files)
media_info.video.duration => 15164 (\<Duration>15s 164ms\</Duration>) media_info.video.duration => 36286 (\<Duration>36s 286ms\</Duration>) media_info.video.duration => 123456 (\<Duration>123.456\</Duration>)
We standardize the naming of several Attributes:
You can review lib/attribute_standardization_rules.yml to see them all
media_info.video.bit_rate => nil (\<Bit_rate>41.2 Mbps\</Bit_rate>) media_info.video.bitrate => "41.2 Mbps" (\<Bit_rate>41.2 Mbps\</Bit_rate>) media_info.general.filesize => "11.5 MiB" (\<File_size>11.5 MiB\</File_size>
In order to support all possible MediaInfo variations, you may see the following situation:
media_info.track_types => ['general','video','video5','audio','other','other2']
The track type media_info.video5 is available, but no video2, 3, and 4. This is because the MediaInfo from the video has:
<track type="Video"> <ID>1</ID> ... <track type="Video"> <ID>5</ID> ...
The ID will take priority for labeling. Else if no ID exists, you'll see consecutive numbering for duplicate tracks in the Media.
Any second level attributes are also available:
MediaInfo.from('~/Desktop/test.mov').general.extra => #<MediaInfo::Tracks::Attributes::Extra:0x00007fa89f13aa98 @com_apple_quicktime_creationdate=2018-03-30 08:12:08 -0400, @com_apple_quicktime_location_iso6709="+39.0286-077.3958+095.957/", @com_apple_quicktime_make="Apple", @com_apple_quicktime_model=0, @com_apple_quicktime_software=11.2>
REXML is used as the XML parser by default. If you'd like, you can configure Mediainfo to use Nokogiri instead:
MEDIAINFO_XML_PARSERenvironment variable to be the name of the parser as you'd pass to a :gem or :require call.
Once you've got an instance setup, you can call numerous methods to get
a variety of information about a file. Some attributes may be present
for some files where others are not, but any supported attribute
should at least return
- Gem version 1.0.0 has been tested on v18.03.1
- Gem versions < 1.0.0 require at least: MediaInfoLib v0.7.25
- Gem versions <= 0.5.1 worked against MediaInfoLib v0.7.11, which did not generate XML output, and is no longer supported.