VLC media player should be able to handle them. It inherits its broad support for codecs and containers obsolete and obscure from the FFmpeg libraries that it's

VLC media player should be able to handle them. It inherits its broad support for codecs and containers obsolete and obscure from the FFmpeg libraries that it's based on. You can also transcode/remux to a newer codec/container using VLC (along with the FFmpeg CLI itself and the several other FOSS GUIs for it dedicated to transcoding), though you'll need to choose a lossless codec or encoding setting to avoid degradation.