i had used twixtor once or twice for slow mohave u used twixter ... for slowmotions???
n creating hdr videos???
no idea about HDR Videos though i have tried slow mo you had to shoot max supported fps your cam can ( i guess 550D Does 60fps ?)
and then you stretch it using twixtor you can do slowmo in certain limitation around 50% is achievable
btw you better create thread for you query as this thread is for Photoshop related
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