## Metadata

Metadata are information describing the content of the file they are part of. For example :

- the title of a music
- the date a photo has been taken
- the duration of a movie
- the author of a text document
- ...

An important feature of Siren is its ability to extract metadata from files and use them in a rename expression through variables.

The information gathered depend on the file extension and, in a few cases, the platform you're using. Caution : by modifying or removing the original extension of a file, Siren may not extract its metadata anymore.

It handles a large file extension catalog : image, audio, video, office document, application package ...

Here is a categorized list of supported extensions :

All platforms
Audio | `aac ape asf au flac kar m4a m4b m4r mid mka mp2 mp3 mpc oga ogg ogm ra rm rmvb wav wm wma`
Video | `3gp avi divx f4v flv m4v mkv mov mp4 mpeg mpg ogv rv swf webm wmv`
Images | `bmp cur dib gif ico jpeg jpg mpo pcx png pnm ppm svg tga thm tif tiff tpic webp xpm`
Raw images | `3fr arw cr2 crw dcr dng erf kdc mef mos mrw nef nrw orf pef raf raw rw2 sr2 srf x3f`
Document | `epub eml odt ods odp ott pdf html htm`
Package | `apk crx deb rpm xpi`
Miscellaneous | `desktop htb iso jar mo otf torrent ttf url war zip`

Windows only
Executable | `exe dll com ocx cpl tlb vbx olb cnv rll`
Office | `doc xls xla xlt pot pps ppt ppa mpp dot msi msp mst`
Miscellaneous | `lnk`

If you are not interested in these metadata and want to save memory and CPU cycles you can disable their extraction in "Preferences/General".