seq是用于索引文件名的序列文件。
DemoData.seq is the sequence file used to index the file names.
在配置文件中，每个序列都有相应的小节。
You will have a section in the configuration file for each sequence.
第一个参数是一个文件序列号，用来组成结果文件名。
The first argument is a file sequence number, which will be used to form the result filename.
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