+ A tag editor with Qt GUI and command-line interface.
+ Supports:
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+ - iTunes-style MP4/M4A tags (MP4-DASH is supported)
+ - ID3v1 and ID3v2 tags (conversion between ID3v1 and different versions of ID3v2 is possible)
+ - Vorbis, Opus and FLAC comments in Ogg streams (cover art via "METADATA_BLOCK_PICTURE" is supported)
+ - Vorbis comments and "METADATA_BLOCK_PICTURE" in raw FLAC streams
+ - Matroska/WebM tags and attachments
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+ Additional features:
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+ - extensive options regarding the file layout (padding, position of tags)
+ - displaying technical information such as the ID, format, language, bitrate, duration, size, timestamps, sampling frequency, FPS and other information of the tracks
+ - allows inspecting and validating the element structure of MP4 and Matroska files
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