问题是Runtime.exec（）不理解shell概念，例如|。而是尝试：

The issue is that Runtime.exec() does not understand shell concepts such as "|". Instead try:

Runtime.getRuntime().exec("/bin/sh", "-c", co);

问题是exec直接运行二进制文件而不调用shell。 |字符只能由shell识别，而不是由sox识别。 -c告诉shell运行单个命令，并将整个命令作为单个参数传递。

The problem is that exec runs a binary directly without invoking the shell. The "|" character is only recognized by the shell, not by sox. The "-c" tells the shell to run a single command, and passes the entire command as the single argument.