the film you're referring to is The Warlords, which is set during the Taiping Rebellion - the second bloodiest war in human history until WW2. The Taiping Rebellion occurred during the later Qing Dynasty, the ethnic Manchurian (Manchu) dynasty that conquered Ming Dynasty China and would rule in increasing decrepitude until the Revolution of 1911 that saw the last emperor (Pu Yi) forced to abdicate as the first Chinese republic was declared under Sun Yat Sen.
The weapons are generally accurate AFAIK, the armour worn by the Taiping rebels more likely than not inaccurate affectations of Chinese cinema. Apparently the tale is based upon a true story of the Taiping Rebellion, including the assassination depicted at the end of the film.
The Ming Army of the Imjin War period I've been promoting so fanatically () was a different critter entirely in terms of uniforms, armour styles, and so on, yet with many of the same weapons and some very different weapon systems long out of use by the time of the Taiping Rebellion.
For a very good read on the Taiping Rebellion, I strongly recommend God's Chinese Son. For the Imjin War, I can recommend with no less enthusiasm A Dragon's Head and a Serpent's Tail. Each will give you a good starting foundation of knowledge of the respective conflicts.
For what the Ming soldiers probably looked like during the Imjin War, you may refer to the Ming Dynasty threads on this forum concerning my L&UL proposals. These are the natural enemies of the samurai of the later end of the 16th century, and IMHO would make an impressive army indeed for the wargame table for both historical and fantasy human forces.