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8127RDK 3.5中，Metadata创建后，怎么没传输出来，通过Onvif的sdp信息中没有Metadata的信息。只有视频、音频的信息。说明metadata没有传输出来，但VA的功能已经开启，并且在创建那块跟踪有输出。RDK是在哪一块有对视频、音频、metadata数据进行分离吗
