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Qiita の記事 (https://qiita.com/yami_buta/items/e18508b04ef9e300775f) を見て、textimg の出力するアニメーションをパイプで img2sixel に渡せたら素敵だなと思いました。
img2sixel の方がtextimgが出力するGIFに対応してなかったので、 saitoha/libsixel#115 で報告し、対応いただきました。
一方、textimg では出力がパイプの場合に png 決め打ちになっていたため、 -a オプションを指定した場合には gif として扱うようにする必要がありました。それを対応しています。
libsixel の修正版との組み合わせで macOS の iTerm2 でアニメーション表示ができるのを確認済みです: