CAM;-;A;cam;is;a;theater;rip;usually;done;with;a;digital;video;camera.;A;mini;tripod;is;sometimes;used,;but;a;lot;of;the;time;this;wont;be;possible,;so;the;camera;make;shake.;Also;seating;placement;isn’t;always;idle,;and;it;might;be;filmed;from;an;angle.;If;cropped;properly,;this;is;hard;to;tell;unless;there’s;text;on;the;screen,;but;a;lot;of;times;these;are;left;with;triangular;borders;on;the;top;and;bottom;of;the;screen.;Sound;is;taken;from;the;onboard;microphone;of;the;camera,;and;especially;in;comedies,;laughter;can;often;be;heard;during;the;film.;Due;to;these;factors;picture;and;sound;quality;are;usually;quite;poor,;but;sometimes;we’re;lucky,;and;the;theater;will;be;fairly;empty;and;a;fairly;clear;signal;will;be;heard.;　　CAM通常是用数码摄像机从电影院盗录。有时会使用小三角架，但大多数时候不可能使用，所以摄像机会抖动。同时由于放摄像机的座位并非总是空的，使得有时拍摄不是水平的。如果后期剪裁很好，这很难看出，除非屏幕下方有字幕。由于声音是从摄像机自带的话筒录制，所以经常会录到观众的笑声等声音，尤其是喜剧片。因为这些因素，图象和声音质量通常都很差。但有时很幸运电影院相当空，这样会录到好一些的声音。