Algorithm 1 TASC-SwinMT Forward Propagation

Require: Input frames $X_1,X_3\in {\mathbb{R}}^{B\times 1\times 512\times 512}$ Ensure: Interpolated frame ${\widehat{X}}_2$, segmentation masks ${\widehat{Y}}_1,{\widehat{Y}}_2,{\widehat{Y}}_3$ 1:Concatenate input frames: $X=\mathrm{Concat}(X_1,X_3)\in {\mathbb{R}}^{B\times 2\times 512\times 512}$ 2:Patch embedding: $F_0=\mathrm{PatchEmbed}\left(X\right)\in {\mathbb{R}}^{B\times 96\times 128\times 128}$ 3:Extract shared features and record skip connections $S_1,S_2,S_3,S_4$: 4:for$i=1$ to 4 do 5:    $F_i=\mathrm{SwinBlock}\left(F_{i-1}\right)$ 6:    $F_i=\mathrm{TALA}\left(F_i\right)$ 7:    $S_i=F_i$ 8:    if $i<4$ then 9:        $F_i=\mathrm{PatchMerging}\left(F_i\right)$ 10:  end if 11:end for 12:Initialize dual decoders: 13:$F_{\mathrm{interp}}=F_4$ 14:$F_{\mathrm{seg}}=F_4$ 15:for$i=1$ to 3 do 16:    $F_{\mathrm{interp}}=\mathrm{PatchExpand}\left(F_{\mathrm{interp}}\right)$ 17:    $F_{\mathrm{interp}}=\mathrm{MSTAF}(F_{\mathrm{interp}},S_{4-i})$ 18:    $F_{\mathrm{interp}}=\mathrm{SwinBlock}\left(F_{\mathrm{interp}}\right)$ 19:    $F_{\mathrm{seg}}=\mathrm{PatchExpand}\left(F_{\mathrm{seg}}\right)$ 20:    $F_{\mathrm{seg}}=\mathrm{MSTAF}(F_{\mathrm{seg}},S_{4-i})$ 21:    $F_{\mathrm{seg}}=\mathrm{SwinBlock}\left(F_{\mathrm{seg}}\right)$ 22:    $F_{\mathrm{interp}},F_{\mathrm{seg}}=\mathrm{CTCI}(F_{\mathrm{interp}},F_{\mathrm{seg}})$ 23:end for 24:Generate final outputs: ${\widehat{X}}_2=\mathrm{InterpHead}\left(F_{\mathrm{interp}}\right)$, $\widehat{Y}=\mathrm{SegHead}\left(F_{\mathrm{seg}}\right)$ 25:Split multi-frame segmentation masks: ${\widehat{Y}}_1,{\widehat{Y}}_2,{\widehat{Y}}_3=\mathrm{Split}(\widehat{Y},\dim =1)$ 26:return ${\widehat{X}}_2,{\widehat{Y}}_1,{\widehat{Y}}_2,{\widehat{Y}}_3$