op _ merge：合并属于同一个应用程序的采样文件。
Op_merge: Merges sample files belonging to the same application.
对文件大小的贡献，按重要性的顺序，依次是视频比特率、音频采样频率、音频比特率，然后是帧速。
Contributing to the file size, in order of importance, are the parameters that set the video bit rate, audio sample frequency, audio bit rate, then frame size.
op _ import：将采样数据库文件从外部格式(abi)转换为本地格式。
Op_import: Converts sample database files from the foreign format (abi) to native format.
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