The KMPlayer is a versatile media player which can cover various types of container format such as VCD, DVD, AVI, MKV, Ogg Theora, OGM, 3GP, MPEG-1/2/4, WMV, RealMedia, and QuickTime among others. It handles a wide range of subtitles and allows you to capture audio, video, and screenshots in many ways.
The player provides both internal and external filters with a fully controlled environment in terms of connections to other splitters, decoders, audio/video transform filters and renderers without grappling with the DirectShow merit system. Internal filters are not registered to user's system to keep it from being messed up with system filters. The KMPlayer Features in detail

Supported Files or Devices
Incomplete/Damaged AVI file (Skip Damaged Frames)
Locked Media Files while downloading or sharing (with realtime index rebuilding under certain condition: AVI downloading in consecutive order)
HTTP Streaming (ASF/OGG/MP3/AAC/MPEG PS/MPEG TS: Only work with internal splitters)
Directshow playback (avi, mkv, mov, mp4, ogg theora, ogm, rmvb, mpeg1/2, http:// etc including almost every audio formats)
Async File Source(network) filter for memory caching
Compressed Audio Album Support(zip, rar)
Shoutcast (Including NSV), Icecast
DTS Wave, and AC3 files, AAC and OGG parser/decoder, Ape/MPC/Flac/Modules(MOD, S3M, MTM, UMX, XM and IT), AMR, ALAC, SHN, WV etc
Google Video(GVI), Flash Video(FLV), Nullsoft Streaming Video(NSV), 3GP, PMP, VOB
Real Engine + Directshow (needs Real Player or Alternative or its decoders)
Supprots surestreamed realmedia files with internal rm splitter(not by external one)
Almost all Real Media files are supported(directshow).
QuickTime Engine + Directshow (needs QuickTime player or Alternative or its decoders)
The formats of tested MOV samples with mp4/mov internal splitter(directshow) : MOV[AVC1+AAC], MOV[CVID+PCM], MOV[SVQ1+ARAW], MOV[SVQ3+QDM2], MOV[SVQ3+MP3], MOV[MP4V+AAC], MOV[CVID+TWOS], MOV[RLE+AAC], MOV[SVQ1+IMA4], MOV[SVQ3+IMA4], MOV[SVQ3+QCLP], MOV[Flash], MOV[MJPEG+PCM], MOV[DVC+PCM], MOV[SVQ1+PCM], MOV[MP4V+ALAC], MOV[MSVC+MP3], MOV[MPNG+QDM2]
Almost all MP4s are supported(directshow).
Mplayer Engine Support
Winamp Input Plugin(decoder) Support
DVD playback, ratDVD support(needs ratDVD filters)
Audio CD(2000, XP only / Win9x-Support by winamp plugin)
Video CD/SVCD/XCD : CDXA Format (2000, XP only)
VCD Image File (BIN/ISO/IMG/NRG) ; NRG needs mplayer.dll
WDM device support like TV/HDTV/Camera/Cam etc
Adobe Flash/FLC/FLI
Various Image files like png, gif etc