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[0:v]scale='if(gt(a,4/3),-1,320)':'if(gt(a,4/3),240,-1)',setsar=1,crop=320:240[v0c]
Gyan
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[0:v]scale='if(gt(a,4/3),-1,320)':'if(gt(a,4/3),240,-1)',setsar=1,crop=320:240[v0c]