Hi, please can you help a cat?

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I have this source video/audio file, it'a SD Sony XDCAM IMX video file with it's audio:


and I have this .WAV file that contain 4 audio channel:


I would like encode with FFMBC the source file so that the audio.wav file become (and substitute) the audio for the final encoded MXF.

Summarize: VIDEO have to be the same, audio of original input source have to be removed, and the new audio have to become the audio of audio.WAV.

How is possible it? thanks