Filters in FFmpeg are implemented via libavfilter library.
In multimedia processing, the term filter means a software tool that modifies input before it is encoded to
the output.
可见filter处理的是编码前的数据。
filter
这个图也可以看出filter处理的是decoded frames。
这个图可以看出filter的输入为decoder的输出。
video filters
References:

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