基于ffmpeg的API，从摄像头采集数据并将其保存为mp4或者avi文件。有详细的中文备注，测试可用。-Ffmpeg' s API to collect data from the camera and save it as mp4 or avi file. Detailed Chinese notes, tests are available.

录制avi经常使用的一些api函数，包括一些讲解-Recording avi frequently use some api function, including some explaining