Nullsoft Winamp is a fast, flexible, high-fidelity media player for Windows. Winamp supports playback of many audio (MP3, OGG, AAC, WAV, MOD, XM, S3M, IT, MIDI, etc) and video types (AVI, ASF, MPEG, NSV), custom appearances called skins (supporting both classic Winamp 1.x/2.x skins and Winamp 3 freeform skins), audio visualization and audio effect plug-ins (including two industry dominating visualization plug-ins), an advanced media library, Internet radio and TVsupport, CD ripping, and CD burning.

Winamp Highlights:
* New portable device features - transcoding, new sync options, USB thumbdrive player support, video sync, direct-from-device playback
* Faster ripping
* Improved AAC and aacPlus encoding
* Unicode metadata, filename, and title support
* iTunes-compatible gapless playback (MP3/M4A) and encoding (M4A)
* Optional 24bit playback
* ReplayGain support

Winamp Player Features:
- Plays Music and Video Files (aacPlus, MP3, AAC, WMA and more!)
- Compatible with Winamp 2 Plug-ins
- Full Support for Classic and Modern Skins
- Plays Videos (NSV, WMV, and more!)
- Powerful Media Library
- Browse SHOUTcast Radio & TV Stations
- Browse Winamp Music Videos & Songs
- Integrated AOL Video Content (News, Sports, Movies & more)
- AOL Radio Featuring XM
- SHOUTcast Wire (podcast directory)
- Predixis MusicMagic (dynamic playlisting)
- Bundled Visualizations
- Burn CDs (Limited to 2x - 48x in Pro!)
- Rips CDs (Limited to 8x aacPlus, AAC, WMA - Unlimited aacPlus, AAC, WMA and MP3 in Pro!)
- 50 free mp3s from Emusic
- Includes Winner of the Internet
- Surround Music Project!
- Includes an MP3 of 'Mercy Me' by Alkaline Trio
- Rip/Encode music into aacPlus, AAC, WMA, or MP3!
- Burn CDs up to 48x!

Changes in Winamp 5.53:
* Improved: Different shell descriptions for different associated filetypes
* Improved: New 'Refine Search' feature in Cover Art Downloader dialog
* Improved: Unicode support for Language Packs incompatible with system locale
* Improved: [in_cdda] Now reads & writes CD data to an NDE database
* Improved: [in_cdda/ml_disc] Reimplementation of simple offline CD Info Editor
* Improved: [in_flac] Faster FLAC metadata gathering
* Improved: [in_mp3] More accurate .AAC length calculation
* Improved: [in_wav/in_mp4] Support for http streaming of files larger than 2GB
* Improved: [ml_disc] Added support for Data CD reading (w.i.p.)
* Improved: [ml_local/nde] Background scanning & database optimizations
* Improved: [ml_local] Unicode compliant filename-based metadata guessing
* Improved: [ml_transcode] Remove trailing periods from destination filepath
* Improved: [pmp_usb] Added AlbumArtist support to Naming Convention
* Fixed: Classic EQ appearing with Modern skins after switch->minimize->restore
* Fixed: Various miscellaneous Album Art related issues
* Fixed: [enc_lame] Now rejects multi-channel and above 48KHz source files
* Fixed: [gen_ff] Translated skin image loading
* Fixed: [gen_ml] Header sort arrow and Rating column display under Windows 2000
* Fixed: [gen_ml] Various drawing glitches when changing views
* Fixed: [in_cdda] CDDB crash under limited connectivity conditions
* Fixed: [in_cdda] Spectrum vis in analog MCI playback mode
* Fixed: [in_flac] Small memory leak when writing FLAC metadata
* Fixed: [in_flv] Last two seconds of flv videos being cut off
* Fixed: [in_mp3] Crash on encountering a bad ID3v2 version (e.g. ID3v2.F)
* Fixed: [in_mp4] Crash on file-not-found during background decode
* Fixed: [in_wave] Infinite loop on attempted repeat playback of dead files
* Fixed: [in_wm] ASX v2 loading
* Fixed: [in_wm] Crash on files & streams with a huge discontinuity jump
* Fixed: [in_wm / out_ds] Copy 'Status' to clipboard Unicode bug
* Fixed: [ml_autotag] Crash with certain tracks
* Fixed: [ml_history] Crash on drag+drop all history items to playlist
* Fixed: [ml_local] Rating of items with Unicode filenames
* Fixed: [ml_online/orb] Nodes dropping to bottom of ML tree on Lang Pack change
* Fixed: [ml_playlists] Play playlist from Media Library main menu item
* Fixed: [pmp_ipod] Filename length incompatibility with iPod Music Quiz v2
* Fixed: [pmp_ipod] Missing 'Advanced' button in Edit Query dialog
* Fixed: [pmp_ipod] Physical deletion of playing file
* Misc: Added Russian installer translation and language pack
* Misc: In2TV removed from Online Services
* Misc: Installer now built with NSIS Unicode version [thanks Jim Park]
* Misc: More miscellaneous general tweaks, improvements and optimizations
* Misc: Moved shared zlib.dll compression library out of winamp.exe
* Updated: Bento skin v1.1 #120