[chc]

AFAIK transcribing the movie could also be copyright infringement. You're effectively reproducing a portion of their work either way -- one in text form, the other in video form. Fortunately for critics, both are widely held to be fair use if done purely for the purpose of commentary and not done excessively.

[analog]

Quote and use screengrabs or short clips sure. 100% of your 'commentary' is composed of the original material, questionable imo.