Python 子进程参数

2022-01-18 00:00:00 python subprocess command-line-arguments

问题描述

例如我正在使用 ffplay 并想运行这个命令 -bufsize[:stream_specifier] integer (output,audio,video)

For example I am using ffplay and want to run this command -bufsize[:stream_specifier] integer (output,audio,video)

目前我有这个:

subprocess.call(["ffplay", "-vn", "-nodisp","-bufsize 4096", "%s" % url])

但这说明它是无效的.

解决方案

正如 JBernardo 在评论中提到的，将 "-bufsize 4096" 参数一分为二，"-bufsize",4096".当 subprocess.call 与 shell=False (默认)一起使用时，每个参数都需要分开.您还可以指定 shell=True 并将整个命令作为单个字符串提供，但由于潜在的安全漏洞，不建议这样做.
As JBernardo mentioned in a comment, separate the "-bufsize 4096" argument into two, "-bufsize", "4096". Each argument needs to be separated when subprocess.call is used with shell=False (the default). You can also specify shell=True and give the whole command as a single string, but this is not recommended due to potential security vulnerabilities. 您不需要在有 "%s" % url 的地方使用字符串格式.如果url是字符串，直接传递，否则调用str(url)得到字符串表示. You should not need to use string formatting where you have "%s" % url. If url is a string, pass it directly, otherwise call str(url) to get a string representation.

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