FFMpeg and FFplay ... But I do not know how fast it runs on classic hardware.
ffplay run alright, but it'll be a slideshow. It uses SDL which isn't helping performance-wise. Due to SDL it likely requires a graphics card.
ffmpeg is a video conversion/processing tool, not a video player.
I'd strongly recommend forgetting about video playback on classic. It just isn't worth the trouble (or money).
