What are the two main reasons synchronized sound, specifically dialogue, was difficult early on?

A sound film is a motion picture with synchronized sound, or sound technologically coupled to image, as opposed to a silent film. ... At first, the sound films which included synchronized dialogue, known as "talking pictures", or "talkies", were exclusively shorts.

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in contrast to the other bands specifically the hardcore punk bands of the period, the music then of the replacements were then more of a melodic. the replacements were an american band in 1979 formed in the minneapolis, minnesota.hope this .