So in theory you could even play small mp4 video's.
Don't forget RealPlayer, it had a very efficient audio encoding for low bitrates http://www.win31.de/esoft.htm - it was later open sourced and called Helix DNA producer.
I think the last version supported for Windows 3.1 was RealAudio 4, even though you might get further along with the win32s setup for 3.11. There is no need though as the low bandwith encoding was the most interesting feature, with Sipro's ACELP perhaps beating even Opus (LPC based SILK or CELT) for very low bitrates < 12 Kbps and for sure beating Speex.
Appearently there is also an mplayer version for dos.. http://mplayerhq.hu/pipermail/mplayer-users/2009-March/07632... and a mpg123 port http://www.fareham.org.uk/music/mpg123/index.shtml
So in theory you could even play small mp4 video's.
Don't forget RealPlayer, it had a very efficient audio encoding for low bitrates http://www.win31.de/esoft.htm - it was later open sourced and called Helix DNA producer.
I think the last version supported for Windows 3.1 was RealAudio 4, even though you might get further along with the win32s setup for 3.11. There is no need though as the low bandwith encoding was the most interesting feature, with Sipro's ACELP perhaps beating even Opus (LPC based SILK or CELT) for very low bitrates < 12 Kbps and for sure beating Speex.
lpcJ, 14_4: IS-54 VSELP (RealAudio 1) 28_8: G.728 LD-CELP (RealAudio 2) dnet: Dolby AC3 (RealAudio 3) sipr: Sipro Lab Telecom ACELP-NET (RealAudio 4/5)