I remember reading about it back in the day, it was aalib and mplayer, but the conversion was done frame by frame with a patched version of aaview. Here&#x27;s the write-up of how it was done: <a href="https:&#x2F;&#x2F;web.archive.org&#x2F;web&#x2F;20150311033450&#x2F;http:&#x2F;&#x2F;onyx.chattanoogastate.edu&#x2F;~jack&#x2F;matrix&#x2F;process&#x2F;" rel="nofollow">https:&#x2F;&#x2F;web.archive.org&#x2F;web&#x2F;20150311033450&#x2F;http:&#x2F;&#x2F;onyx.chatt...</a>