You can make MPlayer play h264-encoded video files a lot faster on multicore machines if you graft some libraries from the ffmpeg-mt project into the resulting mplayer binary. We need to recompile for this.

SMPlayer intends to be a complete front-end for MPlayer (video player), from basic features like playing videos, DVDs, and VCDs to more advanced features like support for MPlayer filters and more.

MPlayer is a movie and animation player that supports a wide range of codecs and file formats, including MPEG 1/2/4,DivX 3/4/5, Windows Media 7/8/9, RealAudio/Video up to 9, Quicktime 5/6, and Vivo 1/2.

MPlayer is a movie and animation player that supports a wide range of codecs and file formats, including MPEG 1/2/4,DivX 3/4/5, Windows Media 7/8/9, RealAudio/Video up to 9, Quicktime 5/6, and Vivo 1/2. It has many MX/SSE (2)/3Dnow(Ex) optimized native audio and video codecs, but allows using XAnim’s and RealPlayer’s binary codec plugins, and Win32 codec DLLs.

MPlayer is a movie and animation player that supports a wide range of codecs and file formats, including MPEG 1/2/4,DivX 3/4/5, Windows Media 7/8/9, RealAudio/Video up to 9, Quicktime 5/6, and Vivo 1/2. It has many MX/SSE (2)/3Dnow(Ex) optimized native audio and video codecs, but allows using XAnim’s and RealPlayer’s binary codec plugins, and Win32 codec DLLs.

smplayer is a cool front end to mplayer and can be used on ubuntu. This tutorial teaches how to install it on ubuntu 9.04 Jaunty

Nice article at Phoronix about adding VA-API (short for Video Acceleration API) support in mplayer and ffmpeg.

MPlayer, the free movie player, has a critical vulnerability according to an advisory from OCert.

Gecko Media Player is a browser plug-in that uses GNOME MPlayer and Mplayer to play media in a browser. It uses the NS4 API and is therefore compatible with all NS4 derived browsers: Iceweasel, Firefox, Iceape, Epiphany, Galeon, Midbrowser, etc.