Source filters provide raw multimedia data from a source like a file, a URL, or a live source like a camera.
源筛选器提供来自源的原始多媒体数据，如文件、URL或类似照相机的实时源。
In addition to configuring the trace listeners, the configuration file creates filters for both of the listeners and creates a source switch for the trace source.
除了配置跟踪侦听器外，配置文件还同时为这两个侦听器创建筛选器，并为跟踪源创建一个源开关。
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