Mplayer/Mencoder

Description from http://www.mplayerhq.hu - not all of the below is (currently) supported on OS/2

MPlayer is a movie player which runs on many systems (see the documentation). It plays most MPEG/VOB, AVI, Ogg/OGM, VIVO, ASF/WMA/WMV, QT/MOV/MP4, RealMedia, Matroska, NUT, NuppelVideo, FLI, YUV4MPEG, FILM, RoQ, PVA files, supported by many native, XAnim, and Win32 DLL codecs. You can watch VideoCD, SVCD, DVD, 3ivx, DivX 3/4/5 and even WMV movies..

MPlayer has an onscreen display (OSD) for status information, nice big antialiased shaded subtitles and visual feedback for keyboard controls. European/ISO 8859-1,2 (Hungarian, English, Czech, etc), Cyrillic and Korean fonts are supported along with 12 subtitle formats (MicroDVD, SubRip, OGM, SubViewer, Sami, VPlayer, RT, SSA, AQTitle, JACOsub, PJS and our own: MPsub). DVD subtitles (SPU streams, VOBsub and Closed Captions) are supported as well.
Some notes on the OS/2 build.

    * updated versions of fslib.dll and sdl12.dll are required - these are included in the below zip.
    * Default dvd drive is s: - to play a DVD, "mplayer dvd://1" to play title 1.  If the dvd drive is not s:, then "mplayer dvd://1 -dvd-device t:" where t: is the drive letter of the DVD drive

Mplayer SVN build - updated 20070120 - needs libc061.dll

mencoder (MPlayer's Movie Encoder) is a simple movie encoder, designed to encode MPlayer-playable movies (see above) to other MPlayer-playable formats (see below). It encodes to MPEG-4 (DivX/Xvid), one of the libavcodec codecs and PCM/MP3/VBRMP3 audio in 1, 2 or 3 passes. Furthermore it has stream copying abilities, a powerful filter system (crop, expand, flip, postprocess, rotate, scale, noise, RGB/YUV conversion) and more.

Mencoder SVN build - updated 20070120 - needs libc061.dll

Ported by Paul Smedley.
http://smedley.info/os2ports/